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Research Article
The first species of the pseudoscorpion genus Lechytia Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from New Zealand
expand article infoJana Christophoryová, Katarína Krajčovičová
‡ Comenius University, Bratislava, Slovakia
Open Access

Abstract

The subfamily Lechytiinae is reported from New Zealand for the first time. A new species, Lechytia novaezealandiae sp. nov., is described and illustrated from Lake Waikare in Waikato District, North Island. In addition, a key to species in the genus Lechytia from Asia, Australia, and New Zealand is included.

Keywords

description, Lechytia novaezealandiae, Pacific Ocean, taxonomy

Introduction

Lechytiines were first recognised as a tribe of the Chthoniidae by Chamberlin (1929). Muchmore (1975) suggested that this species group may actually deserve subfamily or even family rank. Harvey (1992) removed Lechytiini from the Chthoniidae and elevated it to the family level and regarded the lack of an elliptical areole on the rallum and the short inter-maxillary jugum as diagnostic. However, one of the results of the most recent large phylogenomic analysis was the revised rank for Lechytiidae, which is regarded as a subfamily of Chthoniidae (Benavides et al. 2019) and includes 25 species in a single genus (Harvey 2013; Zhang and Zhang 2014). One of them, Lechytia tertiaria Schawaller, 1980, is a fossil Oligocene species from the Dominican Republic (Schawaller 1980).

Lechytiines occur in most regions of the world but particularly in tropical and subtropical zones. Most of them have restricted distributions, being only known from a few locations (Harvey 2013). Twelve species are known from the Americas (including the fossil one), six from Africa, one from each of Turkey and Australia, and six from Asia, including the Pacific region (Harvey 2013; Zhang and Zhang 2014). However, they are small, easily overlooked, and seldom collected, and therefore, the actual distribution of Lechytia is still unknown (Muchmore 1975). This is evidenced by the fact that the genus was not long ago recorded in Australia or China, where both most recently published records (Harvey 2006; Zhang and Zhang 2014) represented new species.

Lechytiines are often corticolous, living under or between the bark of trees and in tree hollows (e.g. Beier 1965; Muchmore 1975; Harvey 2006; Zhang and Zhang 2014), but they have also been found in soil, litter, or moss (e.g. Beier 1955a; Muchmore 1975; Mahnert 1978; Zhang and Zhang 2014), in caves on bat guano (e.g. Beier 1970; Muchmore 1973) and in termite nests (Beier 1959). Lechytia sakagamii Morikawa, 1952 was collected from an albatross nest (Muchmore 2000). This species has been reported from a number of islands in the Pacific Ocean, and Muchmore (2000) presumed that it is likely to be phoretic on sea birds and that humans have also transported it.

We have received two Lechytia specimens and discovered that they represent the first record of the subfamily Lechytiinae in New Zealand. The new discovery led us to provide a description of the new species, here called Lechytia novaezealandiae.

Material and methods

Both specimens of Lechytia novaezealandiae sp. nov. examined for this study had been preserved in 75% ethanol. They were studied as temporary slide mounts, prepared by immersing of the specimens in lactic acid for clearing. After the study, they were rinsed in water and returned to 75% ethanol, with the dissected portions being placed in microvials.

Morphological and morphometric analyses were performed using a Leica DM1000 compound microscope with an ICC50 Camera Module (LAS EZ application, 1.8.0). Measurements were taken from digital images (photographed using a Leica DM2500 compound microscope with a Canon EOS 70D camera) using the AxioVision 40LE application. Reference points for measurements follow Chamberlin (1931). Drawings were generated using a Leica DM1000 drawing tube. Digital photograph of the new species was taken using a Canon EOS 5D camera attached to a Zeiss Axio Zoom V16 stereomicroscope. Image stacks were produced manually, combined using the Zerene Stacker software and edited with Adobe Photoshop CC.

The terminology follows Harvey (1992), except for the use of the terms rallum (Judson 2007) and duplex trichobothria (Judson 2018).

The types of the new species are deposited in the zoological collection of the Museum of New Zealand Te Papa Tongarewa, New Zealand.

Taxonomy

Family Chthoniidae Daday, 1889

Subfamily Lechytiinae Chamberlin, 1929

Lechytia Balzan, 1892

Type species

Roncus chthoniiformis Balzan, 1887, by original designation.

Diagnosis

For the members of Lechytiinae, the most peculiar diagnostic feature is the arrangement of the trichobothria eb and esb on the chelal hand dorsum (in all other chthoniids, these trichobothria are situated at the base of the fixed chelal finger) (Harvey 2006).

Lechytia novaezealandiae sp. nov.

Figures 1, 2, 3

Material examined

Holotype : New Zealand • ♂; North Island, Waikato District, near Lake Waikare [-37.456, 175.189]; 5 m a.s.l.; 25 Jul. 1980; Galina Fedorovna Kurcheva leg.; moss; AF.000964. Paratype: • ♀; same data as holotype; AF.000965.

Figure 1. 

Distribution of Lechytia novaezealandiae sp. nov. in New Zealand (orange circle).

Diagnosis

The new species belongs to the “arborea” group and is characterised by the following combination of characteristics: trichobothria b and sb situated less than 1 areolar diameter apart; palpal chela 3.17–3.30× and palpal hand 1.58–1.60× longer than broad; palpal femur 0.21–0.24 mm, palpal hand 0.16–0.19 mm and chelal moveable finger 0.19–0.22 mm long.

Description

Adults (Figs 2, 3). Carapace (Fig. 3A): 1.08× (♂), 0.94× (♀) longer than broad; with two small corneate eyes; anterior margin denticulate, more markedly in female; in female with 18 setae arranged 6: 4: 4: 2: 2, in male with 17 setae arranged 6: 4: 3: 2: 2; without furrows; with four pairs of lyrifissures, first pair situated antero-medially, the second pair situated interno-lateral to the eyes, the third pair situated slightly interior to the sole pair of setae of the intermediate row, and the fourth pair situated exterior to the sole pair of setae of the posterior row (Fig. 3A). Coxae (Fig. 3C): manducatory process with two distal setae, about equal in length, the distal setae terminally bifurcate (Fig. 3C); coxal spines and intercoxal tubercle absent; chaetotaxy of coxae (Fig. 3C): palpal coxae 3 (♂, ♀); pedal coxae I 4 (♂), 3–4 (♀); coxae II 4–5 (♂), 5 (♀); coxae III 6–7 (♂, ♀); coxae IV 6–7 (♂), 7 (♀); coxa I with small, triangular apical projection with single seta situated at base, other setae on coxa I situated near trochanteral foramen (Fig. 3C). For lyrifissures, see Fig. 3C. Chelicera (Fig. 3B): 1.50× (♂), 1.67× (♀) longer than broad; five acuminate setae and one lyrifissure on hand; moveable finger with one medial seta; both fixed and moveable finger with four (♂) or five (♀) teeth, the distal-most tooth on both fingers largest; galea of ♂ absent, that of ♀ a short rounded nubbin; serrula exterior with 15 blades; rallum consisting of seven blades, subdistal blade strongly recumbent, others in straight row. Pedipalp (Fig. 3D): all setae acuminate; trochanter 1.57× (♂), 1.71× (♀); femur 3.00× (♂, ♀); patella 1.71× (♂), 1.67× (♀); chela 3.30× (♂), 3.17× (♀); hand 1.60× (♂), 1.58× (♀) longer than broad. Fixed chelal finger and hand with eight trichobothria, ib, isb, eb and esb on dorsum of hand, ib and isb basally, esb medially, eb closer to ib and isb than to esb; ist, est and it situated basally on fixed finger, et and dx distally; moveable chelal finger with four trichobothria, b closer to sb than to t; b and sb less than one areolar diameter apart; sensilla absent (Fig. 3D). Venom apparatus absent. Fixed and moveable finger with approximately 9–12 distal small teeth followed by remaining obsolete teeth, fused into a lamina; accessory teeth absent (Fig. 3D). Opisthosoma: tergites and sternites undivided; setae acuminate. Tergal chaetotaxy I–X: (♂, ♀) 6: 6: 6: 6: 6: 6: 6: 6: 6: 4: 1T2T1. Tergal lyrifissures I–X: (♂) 5: 4: 4: 6: 4: 4: 4: 4: 6: 2; (♀) 2: 2: 2: 4: 4: 2: 2: 2: 2: 4. Sternal chaetotaxy II–X: (♂) 10: 15: 12: 9: 8: 6: 6: 6: 6 (Fig. 3F); (♀) 8: 12: 12: 12: 9: 8: 8: 6: 6. All 19 setae bordering male sternite III bifurcate. Sternal lyrifissures II–X: (♂) 4: 2: 2: 2: 2: 2: 2: 1: 0; (♀) 2: 2: 2: 2: 2: 2: 2: 2: 0. Sternal pores II–X: (♂) 1: 2: 3: 5: 2: 2: 2: 2: 8; (♀) 2: 4: 6: 4: 3: 4: 4: 4: 8. Genitalia not studied in detail; those of female weakly sclerotised with U-shaped frame. Leg I: trochanter 1.40× (♂, ♀); femur 3.67× (♂), 3.25× (♀); patella 1.50× (♂), 1.75× (♀); tibia 2.00× (♂), 2.33× (♀); tarsus 5.50× (♂), 4.67× (♀) deeper than broad. Leg IV: trochanter 1.17× (♂), 1.14× (♀); femoropatella 1.91× (♂), 1.77× (♀); tibia 2.60× (♂), 3.00× (♀); metatarsus 2.00× (♂, ♀); tarsus 5.50× (♂), 4.33× (♀) deeper than broad. Legs robust, heterotarsate; tarsi with two elongate gland openings along the dorsal surface, each with crenulated margins (Fig. 3G); arolium slightly shorter than claws, claws simple.

Figure 2. 

Lechytia novaezealandiae sp. nov., paratype female, dorsal. Scale bar: 1 mm.

Figure 3. 

Lechytia novaezealandiae sp. nov., adults, dorsal A carapace (female) B right chelicera (male) C coxae (male) D right chela, showing trichobothrial pattern (male) E detail of structure on palpal hand F chaetotaxy of genital area (sternites II–III) (male) G Right leg I (female). Abbreviations: moveable chelal finger: t–terminal, b–basal, sb–subbasal, st–subterminal; fixed chelal finger: dx–duplex trichobothria, et–exterior terminal, it–interior terminal, est–exterior subterminal, ist–interior subterminal, esb–exterior subbasal, eb–exterior basal, isb–interior subbasal, ib–interior basal. Scale bars: 0.1 mm.

Dimensions

(length/width or, in the case of the legs, length/depth) in mm. Body length 0.78 (♂), 0.97 (♀). Pedipalp: trochanter 0.11/0.07 (♂), 0.12/0.07 (♀); femur 0.21/0.07 (♂), 0.24/0.08 (♀); patella 0.12/0.07 (♂), 0.15/0.09 (♀); chela 0.33/0.10 (♂), 0.38/0.12 (♀); hand 0.16/0.10 (♂), 0.19/0.12 (♀); moveable finger 0.19 (♂), 0.22 (♀). Chelicera 0.15/0.10 (♂), 0.20/0.12 (♀); moveable finger 0.09 (♂), 0.10 (♀). Carapace 0.28/0.26 (♂), 0.30/0.32 (♀). Leg I: trochanter 0.07/0.05 (♂, ♀); femur 0.11/0.03 (♂), 0.13/0.04 (♀); patella 0.06/0.04 (♂), 0.07/0.04 (♀); tibia 0.06/0.03 (♂), 0.07/0.03 (♀); tarsus 0.11/0.02 (♂), 0.14/0.03 (♀). Leg IV: trochanter 0.07/0.06 (♂), 0.08/0.07 (♀); femoropatella 0.21/0.11 (♂), 0.23/0.13 (♀); tibia 0.13/0.05 (♂), 0.15/0.05 (♀); metatarsus 0.08/0.04 (♂, ♀); tarsus 0.11/0.02 (♂), 0.13/0.03 (♀).

Etymology

The specific epithet refers to the island country of New Zealand, on which this species occurs.

Distribution and habitat

Lechytia novaezealandiae sp. nov. Is at present known only from the type locality near Lake Waikare, Waikato District, North Island, New Zealand at an altitude of 5 m. The specimens were collected in moss in July.

Comparisons

Lechytia species have rarely been studied in recent years, and little is known about the relationships between the named species (Zhang and Zhang 2014). Only few characteristics are available for most of them (Muchmore 2000). Two species-groups can be recognised in this genus (Muchmore 1975, 2000). The “arborea” species-group is characterised as follows: bifurcate distal seta on palpal coxa, strongly reduced chelal teeth, tergite XI with chaetotaxy 1T2T1, and male galea is reduced. The “hoffi” species-group is diagnosed as follows: simple distal seta on palpal coxa, well-developed chelal teeth, tergite XI with chaetotaxy T2T, and male galea nearly as well developed as in female (Muchmore 1975, 2000).

The “hoffi” group is presently known to include only two species – Lechytia hoffi Muchmore, 1975 from the United States and L. yulongensis Zhang & Zhang, 2014 from China (Muchmore 1975; Zhang and Zhang 2014). The “arborea” group includes the three American species L. arborea Muchmore, 1975, L. sini Muchmore, 1975, L. chthoniiformis (Balzan, 1887), one Asian species L. sakagamii Morikawa, 1952, and one Australian species L. libita Harvey, 2006 (Muchmore 1975, 2000; Mahnert 2001; Harvey 2006). The remaining species of the genus have not yet been placed into the two known species-groups.

Lechytia novaezealandiae sp. nov. also belongs to the “arborea” group and differs from all above-mentioned species from the “arborea” group by its smaller palpal dimensions (e.g. L. arborea femur 0.31–0.32, chela 0.50–0.52, moveable finger 0.27–0.28 mm; L. sini femur 0.25–0.30, chela 0.38–0.47, moveable finger 0.23–0.27 mm; L. chthoniiformis femur 0.30–0.32, chela 0.46, moveable finger 0.25–0.27 mm; L. sakagamii femur 0.27–0.30, chela 0.41–0.45, moveable finger 0.24–0.26 mm; L. libita femur 0.27–0.32, chela 0.40–0.46, moveable finger 0.24–0.28 mm; but L. novaezealandiae sp. nov. femur 0.21–0.24, chela 0.33–0.38, moveable finger 0.19–0.22 mm) (Beier 1932; Muchmore 1975, 2000; Mahnert 2001; Harvey 2006).

The new species differs from L. indica Murthy & Ananthakrishnan, 1977, L. madrasica Sivaraman, 1980 (both from India), and from L. cavicola Muchmore, 1973 (Mexico) by the presence of eyes on the carapace and smaller palpal femur and chela (Muchmore 1973; Murthy and Ananthakrishnan 1977; Sivaraman 1980).

From known African species, L. novaezealandiae sp. nov. differs by smaller palpal hand and finger, as well as by the position of trichobothria sb and b on moveable chelal finger (in L. leleupi Beier, 1959, L. dentata Mahnert, 1978, and L. natalensis (Tullgren, 1907) trichobothria sb and b are situated close together; in L. serrulata Beier, 1955 and L. maxima Beier, 1955, trichobothria sb and b are situated more than one areolar diameter apart) (Beier 1932, 1955a, 1955b, 1959; Mahnert 1978). The position of trichobothria sb and b is similar in L. novaezealandiae sp. nov. and L. garambica Beier, 1972, but they differ in palpal measurements (e.g. L. garambica femur 0.26–0.27, hand 0.20 mm or chela ratio 3.7–4.4× longer than broad, but in L. novaezealandiae sp. nov. femur 0.21–0.24, hand 0.16–0.19 mm or chela ratio 3.17–3.30× longer than broad) (Beier 1972).

The situation is similar for other known species from the Americas, Asia, and Turkey; L. novaezealandiae sp. nov. differs by smaller palpal segments (L. delamarei Vitali-di Castri, 1984 femur 0.32, finger 0.28 mm; L. chilensis Beier, 1964 hand 0.24, finger 0.33 mm; L. trinitatis Beier, 1970 femur 0.30, hand 0.23–0.24, finger 0.25–0.26 mm; L. martiniquensis Vitali-di Castri, 1984 femur 0.32, finger 0.29 mm; L. kuscheli Beier, 1957 hand 0.25–0.29, finger 0.33–0.39 mm; L. himalayana Beier, 1974 femur 0.50, hand 0.27, finger 0.34 mm; L. asiatica Redikorzev, 1938 femur 0.30, hand 0.20 mm; L. anatolica Beier, 1965 hand 0.24, finger 0.28 mm) (Redikorzev 1938; Beier 1957, 1964, 1965, 1970, 1974; Vitali-di Castri 1984). Additionally, in L. chilensis, L. kuscheli, L. himalayana, trichobothria sb and b are situated more than 1 areolar diameter apart (Beier 1957, 1964), while in L. asiatica, they are contiguous (Harvey 2006).

Identification key to the species of Lechytia from Asia, Australia, and New Zealand

1 Eyes or eyes spots absent 2
Eyes or eyes spots present 3
2 Pedipalps slender; palpal femur 3.05–3.10 times longer than broad; palpal chela 4.20–4.30 times longer than broad L. madrasica
Pedipalps robust; palpal femur 2.20–2.30 times longer than broad; palpal chela 3.80–3.90 times longer than broad L. indica
3 Trichobothria b and sb on moveable chelal finger situated less than 1 areolar diameter or even less apart 4
Trichobothria b and sb on moveable chelal finger situated 1 or more than 1 areolar diameter apart 6
4 Palpal femur shorter, 0.21–0.24 mm long L. novaezealandiae sp. nov.
Palpal femur longer, 0.27–0.30 mm long 5
5 Trichobothria b and sb on moveable chelal finger situated about half an areolar diameter apart; moveable chelal finger 0.24–0.26 mm long L. sakagamii
Trichobothria b and sb on moveable chelal finger contiguous; moveable chelal finger 0.22 mm long L. asiatica
6 Trichobothria b and sb on moveable chelal finger situated 2 areolas diameter apart L. himalayana
Trichobothria b and sb on moveable chelal finger situated 1 areolar diameter apart 7
7 Distal seta on palpal coxa bifurcate; chelal teeth strongly reduced; tergite XI with chaetotaxy 1T2T1; male galea reduced (representative of “arborea” species-group) L. libita
Distal seta on palpal coxa simple; chelal teeth well-developed; tergite XI with chaetotaxy T2T; male galea nearly as well developed as in female (representative of “hoffi” species-group) L. yulongensis

Acknowledgements

Special thanks to Galina Fedorovna Kurcheva, who collected the pseudoscorpions, and to Aleksandr Vladimirovich Matyukhin, who accredited us and sent the old, deposited material for identification. We are very thankful to our friend Erika Igondová for technical assistance with the map and to the reviewers, Mark Stephen Harvey and Catalina Romero-Ortiz, for valuable and constructive comments which improved the quality of the paper. The research was financially supported by VEGA grant 1/0704/20 and by the Slovak Research and Development Agency under the contract no. APVV-19-0076.

Jana Christophoryová would like to dedicate this article to my late mother who always supported me so vigorously in all my achievements. I wish she could have shared this one with me.

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