A revision of the genus Muricea Lamouroux, 1821 (Anthozoa, Octocorallia) in the eastern Pacific. Part I: Eumuricea Verrill, 1869 revisited

Abstract Muricea is an amphi-American genus. Verrill proposed dividing the species from the Pacific Ocean into three genera and established the genus Eumuricea for five eastern Pacific species with tubular calyces. Eumuricea is basically characterized by colonies with elongate, cylindrical calyces with truncate margins and star-like opercula, and the occurrence of unilateral spinous spindles. According to these characteristics, Eumuricea does not show enough difference from Muricea to be treated as a separate genus. Original type material of Eumuricea was morphologically analysed and illustrated using optical and scanning electron microscopy. We conclude that the eastern Pacific species should be placed in the genus Muricea and form a group characterised by tubular calyces that comprises four species at present, Muricea acervata, Muricea hispida, Muricea squarrosa, and Muricea tubigera and a dubious species Muricea horrida. Lectotypes were designated for Muricea squarrosa and Muricea hispida to establish their taxonomic status. The genus Eumuricea has also been misunderstood by former authors who erroneously assigned species to it. For these species we propose new combinations: Swiftia pusilla, Astrogorgia splendens and Astrogorgia ramosa.


Introduction
Muricea Lamouroux, 1821 is an amphi-American genus with representatives in the western Atlantic and the eastern Pacific (Verrill 1869a, Bayer 1961. The eastern Pacific species were revised by Verrill (1869a) in his paper "Notes on Radiata", where three subdivisions for the genus were proposed (Verrill 1869: 449-450), and considered by him as more than subgeneric value -two groups for the eastern Pacific species: Eumuricea and Muricea (family Plexauridae), and a third group for the Indian Ocean: Muricella Verrill, 1869a (presently in the family Acanthogorgiidae).
The genus Muricella includes species with rather thin coenenchyme, filled with long spindles, low subconical calyces arising from between the large spindles, usually standing at right angles from the axis, and covered with much smaller and shorter spindles (Verrill 1869a). As defined by Verrill, many other species could fit in this genus. Fabricius and Alderslade (2001) gave a more precise description: Muricella has planar fans, often net-like, and at least two-thirds of a meter tall. The polyps are short and dome-shaped, non-retractile. The sclerites are mainly spindles and small capstan, and rods. The colonies could be brown, yellow, pink and white. The polyp colour may contrast to the coenenchyme colour. The zoogeographic distribution of this genus is not clear (Fabricius and Alderslade 2001).
The eastern Pacific Eumuricea and Muricea were separated, according to Verrill (1869a), by differences in the calyx structures. He established Eumuricea for species with "tubular calyces, without a prolonged lower border and not bilabiate; and Muricea for species with more or less prominent calyces, with a more or less prolonged lower border, and bilabiate". Hickson (1928) commented on the vaguely-defined characters used by Verrill to separate the Muricea groups, but did not proposed a better alternative. He pointed out, defining Muricea based on "bilabiate calyx" and "one-sided" spindles is inappropriate, especially because the terms were not properly explained. He said that in most of the species of Muricea the calyx is bent more or less upwards, a characteristic that cannot be observed in well preserved specimens, and also that the "one-sided" spindles are present in most of the species and there is a large variety of them. For these reasons Hickson (1928) considered that the only valid character to separate the groups is the tubular calyces in Eumuricea, but he did not refer to that as a character of generic value.
Eumuricea was proposed by Verrill (1869a) for four species in the YPM collection (during his time) from various localities along the eastern Pacific; he also transferred Muricea horrida Möbius, 1861 (from Perú) to Eumuricea. The lack of good illustrations and clear definitions has historically led authors to assign species erroneously to this genus (e.g. Riess 1929(in Kükenthal 1919and 1924, Nutting 1909, Thomson and Simpson 1909, Thomson (1927. Riess (1929) described Eumuricea atlantica from Jamaica; however, her description was not consistent with the characters proposed for Eumuricea. Deichmann (1936) made reference to this same species without any comment about its status. Later, Bayer (1961) clarified the status of E. atlantica as being a species of Muricea. Thomson (1927) listed two species for the eastern Atlantic Eumuricea rugosa and Eumuricea rigida; however, Deichmann (1936) doubted that these species belonged to this genus. Grasshoff (1992) synonymised E. rugosa with Leptogorgia ruberrima (W. Koch, 1886), and Ofwegen (2014) assigned E. rigida to the genus Thesea . Three other species: Eumuricea splendens Thomson & Simpson, 1909, Eumuricea ramosa Thomson &Simpson, 1909, andEumuricea pusilla Nutting 1909, were included in this genus. The taxonomic status of these species is discussed here.
Other authors revisited this genus. Kükenthal (1924) published a key and a short review of the described species of Eumuricea. Aurivillius (1931) commented about this genus and remarked that the species described by Thomson and Simpson (1909), and by Nutting (1909) did not belong to the genus Eumuricea. Bayer in his 1981 key restored several genera that had been treated as junior synonyms or as subgenera by previous authors to a valid generic status, and stated the possibility of several more that would be validated when comparative studies have been completed. Thus, the genus Eumuricea was retained and separated from Muricea.
As it has been addressed before (e.g. Breedy and Guzman 2011), the lack of welldefined characters, good specimen and sclerite illustrations, and holotype designations in the original publications have made it difficult to recognise with certainty the species of Muricea (as is the case in other eastern Pacific genera).
This research represents the first part of the fifth review in a series proposed to evaluate the gorgonian genera historically reported for the shallow eastern Pacific waters. The second part will treat the genus Muricea Lamouroux, 1821 sensu stricto. Previous reviews dealt with Pacifigorgia Bayer, 1951 (Breedy andGuzman 2002), Leptogorgia Milne Edwards &Haime, 1857 (Breedy andGuzman 2007) and Eugorgia Verrill, 1868(Breedy et al. 2009), in the family Gorgoniidae; and Heterogorgia Verrill, 1868 in the family Plexauridae (Breedy and Guzman 2011).

YPM
Yale Peabody Museum of Natural History, New Haven, USA ZMH Zoologisches Institut und Zoologisches Museum der Universität Hamburg, Germany

Material and methods
The type specimens used in this study were analysed during visits to museums or acquired on loan from the BM, MCZ, USNM, and YPM. Comparative material was analysed from the collections deposited in CRBMco, IMARPE, INN and UPCH. In addition to specimens recently collected from the Pacific coast of Costa Rica and Panama deposited in the UCR and STRI. All reference material was collected by scuba diving down to 40 m in depth. The type material presented here from the western Atlantic and Indo-Pacific was the only one available to us at this time.

Morphological study
For microscopic study, specimens were prepared for SEM following the standard protocol described in Breedy and Guzman (2002). For optic microscopy, sclerites were mounted in water or glycerine and photographed with an Olympus LX 51 inverted microscope. Sclerites of the coenenchyme and calyces are variable in size and form; the prevailing kinds are illustrated and described. Measurements of the sclerites were obtained from pictures and directly from the microscope using an optical micrometer. Length of the sclerites was measured from one tip to the other and the width was taken from the most distant points across the sclerites, reporting the largest sizes found in the samples and also, a range of variation. The diameter of the branches, branchlets, and stems are given taking in account the calyces length, the reported measurements represent the largest sizes found in the sample and in some cases, a range of variation. The mean number of calyces by cm was taken from pictures, counting the number of calyces on one side (the one showed in the picture) of each tip branch of the colony and is reported as the mean (number of calyces by cm/ number of branches measured). The limitations found in this procedure were due to the preservation state of the specimens and the number of branches. We emphasize that this measure is just a reference number and does not represent the real number of calyces/cm around the branch of each species, but is a good character to show the tendency in a species. The calyx length given corresponds to the upper parts of the branches. The colours of the colonies and sclerites are stable, and persist after fixation. Some fading is observed in dry specimens. When possible the colours of the colony alive, preserved and dry are mentioned. Data on geographical distribution are from our personal collections, museum catalogues, and published monographs. In some cases there is just one specimen in the collection under a species name, which automatically constitutes the holotype. When needed we designated lectotypes to establish the species identity and avoiding future confusion.

Terminology
Terminology is according to Bayer (1961) and Bayer et al. (1983). Some term modifications dealing with Muricea descriptions are included below.
branched spindle: a spindle with some of the processes much elongated and branchlike, often crooked. calyx: cylindrical or wartlike projecting anthostele. In Muricea, it is mostly formed by the same type as the outer coenenchyme sclerites. They are arranged as a fringe around the border of the calyx with the sharp or spiny processes projecting outwards. calyx shelf-like: calyx with prolonged lower border, polyp opens upwards. calyx tubular: tube-like calyx with mostly even, truncate borders, polyp opens straight and distally. club: monoaxial sclerite enlarged at one end, the head, and tapered at the other end, the handle. According to the modification of the head they are classified in leaf, thorn, wart or torch. Muricea, the heads are mostly ornamented by sharp, thorn-like or spine-like processes, and the handles are warty, or of an almost smooth surface, curved or straight. unilateral spinous spindles: sclerites with asymmetrically arranged warts on the surface.
Inner side with low composite warts, close together or very crowded, their processes often anastomose. Outer side with fewer cone-shaped tubercles, long projecting in some cases. Ends of the sclerites blunt, acute or both.

Notes on morphological characters
Variation is expected in the diameter of stems and branches either in preserved or dry material, due to the preservation history of specimens. Most of the type material is dry and old (more than a century). Some specimens are deteriorated. According to Hickson (1928) the drying or preservation process can affect some characteristics, especially the calyces. However, we have observed that the tendency of the calyces to be slightly raised or prominent is kept after retraction during preservation, and it is also observed in living specimens. The calyx length and spacing vary from the larger branches to the thinner, being larger and acute, and closer placed on the branchlets and shorter, blunt, and distant on the main branches. For these reasons, we record measurements of these characters from the upper part of the branches. The sclerites that compose the outer coenenchyme and the calyx are mostly large spindles of several shapes. Bayer (1961) refers to this type of spindle as unilateral spinous and it is the term that we used here for the descriptions (defined above). The polyp sclerites are basically rods and spindles, in most of the cases it was not possible to determine the anthocodial arrangement because of the deterioration of the type material, few type specimens were found preserved in ethanol. However, we did notice that there is no collaret and points arrangements as in other plexaurids. The sclerites are mostly placed longitudinally in irregular arrangements or in some cases in points. Although some variation is expected, the colour of sclerites and colonies is remarkably constant. Some species dye the ethanol a dark purplish colour when preserved. In this genus, colours are mostly hues of brown, and the sclerites do not present much colour variation.
Distribution. From Cape Hatteras, North Carolina to Brazil, including Bahamas, Greater and Lesser Antilles, and Caribbean islands (Bayer 1961); in the eastern Pacific from southern California to Peru. The genus occurs at depths down to 200 m, but normally found less than 100 m. Muricea midas Bayer, 1959 is the deepest record for the genus in the western Atlantic, 146 m (Bayer 1959); and Muricea galapagensis Deichmann, 1941 in the eastern Pacific, 91 m.
Remarks. Colony shape and branching patterns are variable among Muricea species. The shape of calyces shelf-like or tubular, and related features as being imbricate or sparse show many intermediate forms. In the tubular-calyces species group the apical branches show a closer arrangement of calyces and smaller projecting angles in respect to the branch than at the lower branches. Therefore, the strongest character that separates Muricea from other genera is the type of sclerites.
Description. The holotype is a 20 cm tall and 12 cm wide colony, the branching is lateral, almost in one plane ( Fig. 1A) candelabrum-like. All branches are thick and rigid with almost the same diameter, 7-8 mm, from base to top. Two main branches, subdivide from a 2 cm long stem in secondary branches that remain unbranched up to the top of the colony, or subdivide up to 3 times producing branchlets of almost the same diameter. The branches are up to 20 mm apart, branch at angles of 45°-90°, and curve upwards, with blunt tips. Undivided terminal ends are up to 7 mm in diameter and 70 mm long ( Fig. 1A-B). A vestige of the holdfast remains at the base of the stem. Axes are  amber at the tips and darker at the base. Calyces are uniformly crowding the branches, close together, about 21 calyces/cm. They are up to 2.50 mm long and about the same in width, 1.8-2.0 mm. The rounded, small calyx apertures contain remains of anthocodial sclerites. The anthocodia are retracted and the eight projections of the calyces close over them. They are separated by slightly sunken grooves, which show an octoradiate star-like arrangement, that Verrill remarked as typical of this species (Verrill 1869a) (Fig. 1B). However, it is the normal condition of polyps in this genus, when retracted. The coenenchyme is thick compared with the other three species. The outer coenenchyme is composed basically by the same type of sclerites found in the calyx. They are spindles of several shapes, mostly unilateral spinous, curved, straight, with blunt or acute ends, or one acute end and the other bifurcate. They are 0.50-1.82 mm long and 0.15-0.28 mm wide ( Fig. 2A), Verrill (1869a) reported spindles up to 2 mm long. They are of a light brownish to dark orange colour, some with the outer surface darker than the inner (Fig. 1C). The axial sheath is composed of pale yellow to colourless (Fig. 1C), warty elongated spindles 0.15-0.30 mm long and 0.060-0.085 mm wide (Fig. 2B), and irregular radiates, up to 0.24 mm long and 0.10 mm wide (Fig. 2C). Anthocodial sclerites are pale yellow, irregular warty rods with a spinulose end 0.25-0.30 mm long and 0.037-0.060 mm wide, and small torch-like clubs with a warty handle, measuring up to 0.28 mm long and 0.10 mm wide (Fig. 2D). The colour of the colony is brown.
Distribution. Reported only from the type locality, Bay of Panamá. This species has not been found in our recent surveys along the Pacific coast of Panamá. No data available about the depth range.
Remarks. This species was first mentioned by Verrill (1866) as Muricea acervata in 1869. It was transferred to the genus Eumuricea and properly described from just one specimen from Panamá that represents the holotype. The species is different from the others by the thicker coenenchyme, and especially the shorter calyces with a wider apical aperture that exposes the contracted polyps, which in the other species are hidden in the tubes. The dark orange colour of the calycular and coenenchymal sclerites is not present in the other species, which are of various hues of brown instead. Description. The lectotype is an 8.5 cm tall and 4 cm wide incomplete colony, branching is sparingly dichotomous (Fig. 3A). A short stem, 0.4 cm long, arises from a small remainder of the holdfast, and subdivides in two main branches deprived of coenenchyme, one of them is broken and the other subdivides in two secondary branches, 7-10 mm in diameter, that subdivide up to 4 times. All branches are almost the same diameter, with blunt, clavate tips. The branches are separated at distances of 0.6-5 cm and growing upwards at close angles of 30°-45°. Undivided terminal branches are up to 20 mm long, and 8 mm in diameter. The axes are dark brown at the base, and amber at the branchlets. The calyces are all around the branches, close together, about 14 calyces/cm. They are tubular and elongated reaching up to 3.5-4.0 mm long and up to 1.8-2.0 mm wide at the clavate tips; with projecting spines around the polyp apertures (Fig. 3B). The polyps are situated at the summit of the tubular calyces, the apertures are covered by anthocodial sclerites that represent what remained of the polyps. The coenenchyme is very thin, basically composed by the same type as the calyx sclerites. The outer coenenchyme and calycular spindles are unilateral spinous, spinulose on the outer surface and warty on the inner, 0.90-1.60 mm long and 0.14-0.20 mm wide, with acute ends, or one acute and the other blunt; others have stout, complex terminal spikes, 0.57-0.83 mm long and 0.10-0.14 mm wide (Fig. 4A, B). The axial sheath is composed of warty spindles with sparse warts and/or conical tubercles with acute tips; and irregular rods branched at one end, 0.13-0.56 mm long and 0.04-0.09 mm wide (Fig. 4C). The anthocodial sclerites are complex irregular branched forms, thorn scale-like with complex warts on the surface, sparse conical spines and/or with one spinulose end; irregular club-like spindles with warty handlers, straight or curved, and with spinulose, shaft-like heads. These sclerites are 0.26-0.70 mm long and 0.05-0.03 mm wide (Fig. 4D). All the sclerites are colourless (Fig. 3C). The colour of the colony is light brown.
Remarks. This species was first mentioned by Verrill in1866, together with M. acervata with a minimal description. They both were properly described in 1869a. Muricea hispida was described from two specimen fragments from Panamá. Muricea hispida is similar to M. squarrosa and M. tubigera. These three species have long tubular calyces, similar colour and shape of the colonies. The main difference that separates them is the calyx length M. tubigera with the largest and M. squarrosa with the shortest (Table 1). The calyces in M. hispida are sharp and distally curved upwards with projecting spines beyond the calyx border as in M. tubigera, however, the latter has thinner, longer and more crowded calyces (Table 1). Muricea tubigera has the largest spindles, up to 2 mm long, in M. hispida up to 1.6 mm and in M. squarrosa, up to 1.3 mm (Table 1). Muricea hispida was misidentified in some collections, including the syntypes. For example, YPM 1636 listed as a syntype belongs to a different Muricea species, and other specimens, such as USNM 49386, 1016582 belong to M. squarrosa. We designate YPM 567as the lectotype of M. hispida to establish the identity of this species and avoid future misinterpretation. Figure 5 Muricea horrida Möbius, 1861: 11-12;Kölliker 1865: 135;Harden 1979 Description (after Möbius 1861 and Verrill 1869a). The figured specimen is a fragment of a 20 cm tall and 22 cm wide colony with a thin, 6 cm diameter holdfast attached to a rock. The branching looks mostly dichotomous and starts close to the base (Fig. 5 [5]). The branches are closely placed and divergent, they subdivide at small angles and up to 6 times. All branches are about the same diameter with slightly tapered ends. Undivided terminal branches are short. The axes are brown at the base, and light yellow at the branchlets. The coenenchyme is granulose and brittle. The calyces are all around the branches, close together. They are mostly standing perpendicular to the branches, closer together and inclined upwards, at smaller angles, at the upper branch- lets (Fig. 5[6]). They are tubular and elongated, up to 1.5 mm long with truncate tips. There is not enough information about the sclerites. They are straight or curved warty spindles reaching up to 1.2 mm long. They are yellow and seem asymmetric, perhaps unilateral spinose as for the genus, but from the drawings it is difficult to tell (Fig. 5[7,  8]). The colour of the colony is light brown.
Remarks. According to Kükenthal (1924, in key) M. horrida differs from M. squarrosa in having shorter coenenchymal sclerites. Möbius (1861) description and illustration show a species that is similar to M. squarrosa from Perú. Muricea squarrosa is a common species in Perú. We did not find another similar species, a possible M. horrida, in the UPCH octocoral collection that is very comprehensive and well documented. It is indeed possible that M. squarrosa is a synonymous of M. horrida; however, without a specimen to analyse we prefer to keep the status of M. horrida as dubious. Description. The lectotype is a 14 cm tall and 12 cm wide colony, flabellate, spreading in one plane. It has a sponge attached to the main branches (Fig. 6A). The branching is mostly dichotomous. A short stem, 0.4 cm long, 60 mm diameter, arises from an irregular holdfast, 23 mm in diameter, covered by a layer of coenenchyme, but deprived of calyces. The stem subdivides in two main branches that produce secondary branches subdividing up to 3 times. All branches are about the same in diameter, 40-80 mm (including calyces), with tapered ends. The branches are separated at distances of 0.5-6 cm and spread at small angles and bend upwards in a curve. The branchlets are situated almost perpendicular to the main branch. Undivided terminal branches are up to 40 mm long. The axes are brown at the base, and lighter at the branchlets. The calyces are all around the branches, close together, about 14 calyces/cm. They are mostly directed perpendicular to the branches, but also incline upwards at small angles (Fig. 6B). They are tubular and elongated, up to 2.6 mm long and up to 1.75 mm wide with clavate tips, between the larger calyces there are a number of smaller ones (Fig. 6B). The remains of the polyps are at the summit of the tubular calyces, the apertures are covered by anthocodial sclerites. The coenenchyme has a few layers of sclerites and is basically composed of the same types as the calyx spindles. They are straight or with a slight curvature. They are mostly acute, but can have one end blunt or lobed. They are unilateral spinous with the inner side with complex warts, crowded together so much that their processes anastomose, while on the outer side there are less and sparse spines. Some calycular spindles are club-like with warty elongated handles, straight or curved, and various types of head arrangement, from few conical spines to sharp and long spines crowding the upper part or along the outer side of the sclerite; they have stout terminal spikes (Fig. 7A). The spindles reach up to 1.3 mm long and 0.23 mm wide (Fig. 7A), Verrill (1869a) reported spindles up to 1.8 mm long. They are of a dull yellow to a light brownish colour. The axial sheath is composed of whitish and colourless, tuberculate spindles, 0.14-0.30 mm long and 0.03-0.075 mm wide (Fig. 7C) and irregular forms with-the same range of size, and immature forms 0.06-0.07 mm long and 0.015-0.02 mm wide. The anthocodial sclerites are of a pale yellow colour to colourless, mostly club-like as described for the calycular spindles, but shorter (Fig. 7B). The colour of the colony light brown.

Muricea squarrosa
Variability. The other material examined is very consistent with the lectotype, variation is basically in the number of branches and size of the colonies. The largest colony measured was a specimen from Perú reaching 35 cm tall and 30 cm wide (Fig.  8C, in situ). The colony branching is abundant in some colonies (Fig. 8C, D). The colour of the colonies when alive is reddish brown (Fig. 8A-D). This colour fades in dry or ethanol preserved colonies. Fresh collected colonies turn the alcohol into a dark brownish colour. The polyps are pale yellow to whitish (Fig. 8A-D). Remarks. This species was described by Verrill (1869a) with specimens from Pearl Islands without a holotype designation and appropriate illustrations. We designate YPM 1561a as the lectotype of M. squarrosa to establish the identity of this species and avoid future misinterpretation.
The main difference to separate this species from M. hispida and M. tubigera is that the calyces are shorter and more distantly placed. Other differences were discussed above (under M. hispida).
Description. The holotype is a 17 cm tall and 10 cm wide stout and rigid colony, branching mostly dichotomous (Fig. 9A). A short stem, 1 cm in diameter, 1.5 cm long, arises from an oval 3 cm diameter holdfast, and subdivides in two main branches, 0.8-1.2 mm diameter, that fork producing secondary branches that subdivide up to 3 times. All branches are almost the same diameter with blunt, clavate tips. The branches are at distances of 2-7 cm apart and stick upwards at small angles of 30°-35°. Undivided terminal branches are up to 70 mm long, and 7-8 mm in diameter. The axes are dark brown. The calyces are uniformly crowding the branches, close together, about 26 calyces/cm. They are tubular, slender and elongated, up to 5 mm long and up to 0.75 mm wide, with clavate summits. The borders of the calyces are surrounded by long, slender and sharp spindles that project from the surface giving a prickly appearance to the branches (Fig. 9B). What remains of the polyps is at the summit of the elevated calyces, the apertures are covered by anthocodial sclerites and some calyx sclerites. The coenenchyme is of a few layers of sclerites, basically of the same types as the calyx spindles. They are mostly unilateral spinous spindles, large, slender, with sharp, blunt or bifurcated ends, some are spinulose on the outer surface and tuberculate on the inner, measuring 0.80-2.0 mm long and 0.07-0.30 mm wide (Fig. 10A). The calyx wall is mostly formed by warty, slender rods with one end acute and the other with long complex spines These sclerites are 0.435-0.76 mm long and 0.50-0.65 mm wide, they can have conic spines on the outer side of the sclerite and sparse warts on the inner side (Fig. 10 B). Verrill (1869a) reported a maximum size of 2.34 mm long. The axial sheath is composed of warty spindles (Fig. 10C) and tuberculate radiates, 0.12-0.46 mm long and 0.1-0.4 mm wide (Fig. 10D). All sclerites are whitish to colourless (Fig. 9C). The colour of the colony is light brown.
Distribution. Reported only from the type locality, Pearl Islands, Panamá. This species has not been found in our recent surveys along the Pacific coast of Panamá.
Remarks. Verrill (1869a) described this species with one specimen that constitutes the holotype. The very long and slender calyces of this species, the sharper spindles and the thickness of the branches separate this species from the others (Table 1). Figure 12 Synonymy in Breedy et al. (2015) Diagnosis. Colonies branching mostly in one plane, fan-like, dichotomous, pinnatelike, or unbranched. Branches mostly free or with some anastomosing. Polyp mounds conical, prominent, or slightly raised, scattered or crowded, usually biserial and with two opposed polyp mounds at the tip of the branches. Coenenchyme usually thin. Coenenchymal sclerites mainly capstans, radiates and spindles. Thin, sharp and elongated spindles concentrated in the polyp mounds. Anthocodiae with points arrangements of bar-like rods straight or curved, frequently long. Collaret absent or of a few bar-like rods. Axis horny and flexible. Colour of the colonies red, orange, pink, or white.
Swiftia pusilla (Nutting, 1909), comb. n. Figure 11 Eumuricea pusilla Nutting, 1909: 718-719;Kükenthal 1924: 152. Material. Holotype. USNM 25430, ethanol/dry preserved, Point Loma, San Diego, California, Albatross R/V, California Coast Expedition, 166-177 m, 15 May 1904. Description (after Nutting 1909. The holotype was a small, roughly flabellate colony, 37 mm long, branching in an irregular manner. The main stem gives off four alternate branches at irregular intervals, the two longest being 13 mm apart. The calyces are low rounded domes, about 1 mm long and 2 mm wide, separated about 2.5 mm from summit to summit. The polyps are completely retracted. "The calycular walls are covered with very hispid spicules (sclerites), which have their edges somewhat overlapping and are, in general, disposed transversely rather than otherwise". Nutting reports the presence of a collaret and tentacles armed with sharp spindle-shaped sclerites longitudinally arranged, but in chevron at the base of the tentacles. Other type of sclerites are asymmetrical spindles with irregular sharp edges and processes, various types of clubs, scales, stars and double stars. The colour of the colony is whitish to gray.
Distribution. Reported for the type locality Point Loma, California. Remarks. What remain from the holotype are small pieces of branches: two fragments, 16 mm and 12 mm long, the former with 9 polyps, the latter with 5 (pers. Figure 11. Swiftia pusilla (Nutting, 1909). A Fragment of the holotype B SEM sclerites. Photographs by S. Cairns (USNM). comm. S. Cairns) (Fig. 11A). Nutting's illustrations (1909, PL. LXXXVIII) show some fragments of a thin colony. The sclerites are almost disintegrated, SEMs obtained by S. Cairns (USNM) show spindles as the prevailing type of sclerites (Fig. 11B). It is not possible to confirm the other types of sclerites described by Nutting (1909) and his description is fairly general. However, the characteristics that we could analyse of the species fit with the genus Swiftia. For this reason, we herein propose the genus Swiftia as a more accurate alternative for the species (Table 2).
Diagnosis [based on Grasshoff (2000), Fabricius and Alderslade (2001), Hermanlimianto and Ofwegen (2006)]. Colonies growing in one plane as open fans, with irregular lateral branching, never net-like. Polyps retractile into raised calyces, arranged in rows or all around the branches. Coenenchymal sclerites mostly spindles, straight, curved, branched, heavily ornamented with complex tubercles, and prickles; and smaller spindles and some capstans in the inner-coenenchyme. Anthocodiae with numerous  Thomson, 1927Grasshoff, 1992 Leptogorgia ruberrima flattened sclerites around the tentacle bases and up the tentacles in numerous oblique rows. Collaret does not occur. Colour of the colonies, various hues of red, orange, yellow, whitish or yellowish brown.
Astrogorgia splendens (Thomson & Simpson, 1909), comb. n. Figures 12-13 Eumuricea splendens Thomson & Simpson, 1909: 258-259.  Thomson and Simpson (1909)]. The holotype is a 9.5 cm tall and 6 cm wide colony. Several stems arise from a spreading holdfast but only one branch ramifies in two secondary branches, the others are broken close to the base (Fig. 13A, B) that is partially covered by a sponge. The branching is lateral and irregular, predominantly in one plane. Secondary branches subdivide up to 7 times upwards at small angles. Free end branches reach up to 3.5 cm long. The axis is horny and of a light brown colour. The polyps are prominent and distributed longitudinally in two rows at the base of the main branches, but more irregularly and crowded at the upper parts. The calyces are prominent up to 2 mm in diameter and up to 1.5 mm high (Fig 12B). The anthocodial sclerites are arranged in collaret and points, "en chevron" at the base of the tentacles. The anthocodiae are completely retractile and show an octoradiate star-like arrangement. The coenenchyme and calyces are composed of whitish and reddish sclerites (Fig. 12C). They are mostly warty spindles, straight, curved, and branched, mostly with acute ends, and ornamented with complex tubercles and prickles. These spindles measure 0.21-1.0 mm long and 0.046-0.16 wide (Fig. 13). The anthocodials are warty rods, 0.15-0.20 mm long and 0.03-0.06 mm wide (Fig. 12C). The colour of the colony is pale pink with reddish calyces.

Material
Distribution. From the type locality, Marbel Rock, Mergui Archipelago, Andaman Sea, Indian Ocean. No data available about the depth range.
Remarks. The two species described in Eumuricea by Thomson and Simpson (1909) appear in the BM catalogue as species of the genus Muricella, ramosa and splendens. However, Fabricius and Alderslade (2001), and Grasshoff (1999) refer to the genus Muricella as being planar large fans, often net-like, and large, with thick coenenchyme. Eumuricea splendens sensu Thomson & Simpson (1909) is a small specimen 9.5 cm in height, and E. ramosa is supposedly a large specimen, both with thin coenenchyme, and without net-like colonies. The description and sizes of the sclerites given by the above authors for the genus Muricella do not fit these two species. Furthermore, Thomson and Simpson's (1909) holotype of E. splendens does not agree with the characteristics of Eumuricea. Although Thomson and Simpson (1909), acknowledge some resemblance with E. acervata, the holotype does not have tubular calyces and does not show the characteristic unilateral spinous spindles of Eumuricea. The dominant types of sclerites are acute warty spindles and variations. Therefore, we propose to transfer this species to the genus Astrogorgia.

Material. None available.
Description [based on Thomson and Simpson (1909)]. Thomson and Simpson (1909) described a colony 23 cm tall and 30 cm wide. The branching is irregular, predominantly in one plane. The main stem is sinuous, about 8 mm in diameter arising from a conical holdfast. The branches are tapered at the ends, and the twigs are of almost the same thickness throughout, some are clavate. The axis is horny, composed of thin sheets of gorgonian. The coenenchyme is moderately thin. It is composed of colourless sclerites irregularly arranged at the lower part of the branches and more longitudinally placed at the twigs. The polyps are distributed all around the branches closer at the upper branches and more separated at the lower parts. The anthocodiae are completely retractile into slightly elevated cones, 1 mm in height and 1 mm in diameter at the base. The anthocodial sclerites are arranged in eight distinct groups "en chevron" at the base of the tentacles with projecting teeth around the oral aperture. The coenenchymal sclerites are spindles, straight, curved or S-shaped, with acute or blunt ends, with the surface covered by warts, they measure 0.4-1.5 mm long and 0.075-0.17 wide. The anthocodiae are club-shaped, with warty heads and smooth handles, 0.3-0.6 mm long and 0.05-0.1 mm wide. The colour of the colony is a greyish white.
Distribution. From the type locality, Andaman sea, Indian Ocean, 83-494 m in depth.
Remarks. We only have a few drawings of sclerites of this species from Thomson and Simpson (1909: Plate VIII. Fig. 15). The type material was not available for analysis , however, the sclerite drawings, the depth range and the geographic distribution of this species is not consistent with the genus Eumuricea. Considering that the Thomson and Simpson's (1909) description and illustrations of this species and E. splendens closely agree; we also propose, with some caution, to transfer E. ramosa to the genus Astrogorgia (Table 2).
Remarks. Thomson (1927) described two species of Eumuricea, E. rigida and E. rugosabut neither of these fit in the genus Eumuricea. The former was transferred to Thesea (Table 2) by Ofwegen (2014), and the latter does not show the characteristic spheroid plate-like sclerites of Thesea in the outer coenenchyme. The coenenchyme of E. rugosa is composed of acute, elongated spindles instead. We confirm the finding of Grasshoff (1992) that this is nothing other than Leptogorgia ruberrina (W. Koch, 1886).

Conclusions
Firstly, we conclude that Verrill's genus Eumuricea was misinterpreted by former authors who erroneously assigned this genus to a diverse group of species. Secondly, that Eumuricea corresponds to a group of Muricea with tubular calyces as Verrill proposed, but because all other characteristics are found in Muricea, we do not consider the shape of the calyx as a sole character to separate this genus, since there are at least three more types of calyx structure within Muricea. And thirdly, the Muricea group with tubular calyces comprises four valid species M. acervata, M. hispida, M. squarrosa and M. tubigera, and a dubious one, M. horrid, reported for the eastern Pacific. It is intriguing that Muricea squarrosa is the only species in the genus that recently has been collected at various localities along the eastern Pacific. Although extensive surveys have been conducted along the Pacific coast of Panama and Peru (main type localities), the other species have not been found. Presently, we do not have data to support the idea of local extinction of species, but it is very likely that changing oceanographic conditions could have affected octocoral diversity. Perhaps more survey effort along the eastern Pacific would give further information about this genus. Presently, we recommend taking into account the status of the species of Eumuricea for biodiversity records and assessments.