Research Article |
Corresponding author: Shuqiang Li ( lisq@ioz.ac.cn ) Academic editor: Yuri Marusik
© 2019 Wan-Jin Chang, Shuqiang Li.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Chang W-J, Li S (2019) Fourteen new species of the spider genus Thaiderces from Southeast Asia (Araneae, Psilodercidae). ZooKeys 869: 103-146. https://doi.org/10.3897/zookeys.869.35546
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Fourteen new species of the genus Thaiderces F.Y. Li & S.Q. Li, 2017 from Indonesia, Myanmar, and Thailand are described: T. shuzi Li & Chang, sp. nov. (♂♀), T. peterjaegeri Li & Chang, sp. nov. (♂), T. ganlan Li & Chang, sp. nov. (♂♀), T. ngalauindahensis Li & Chang, sp. nov. (♂), T. yangcong Li & Chang, sp. nov. (♂♀), T. zuichun Li & Chang, sp. nov. (♀), T. miantiao Li & Chang, sp. nov. (♀), T. jiazi Li & Chang, sp. nov. (♀), T. tuoyuan Li & Chang, sp. nov. (♂♀), T. fengniao Li & Chang, sp. nov. (♂♀), T. haima Li & Chang, sp. nov. (♂♀), T. chujiao Li & Chang, sp. nov. (♀), T. thamphadaengensis Li & Chang, sp. nov. (♂♀), and T. thamprikensis Li & Chang, sp. nov. (♂♀). In addition, two species of Psiloderces Simon, 1892 are transferred to Thaiderces: Thaiderces rimbu (Deeleman-Reinhold, 1995) comb. nov. (♂♀) and Thaiderces djojosudharmoi (Deeleman-Reinhold, 1995) comb. nov. (♂♀).
endemic, Indonesia, Myanmar, new combination, Ochyroceratidae, Sumatra, Thailand, tropical
The spider family Psilodercidae Machado, 1951 was recently elevated from a subfamily of Ochyroceratidae Fage, 1912 to family rank (
Prior to this study, only two species of Thaiderces were known: T. jian Li & Li, 2017 and T. vulgaris (Deeleman-Reinhold, 1995) (WSC 2019). Both species are endemic to Thailand. While studying new material collected in Southeast Asia, we found fourteen new species of Thaiderces from Myanmar, Thailand, and Sumatra Island of Indonesia. The goal of this paper is to provide detailed descriptions of these new species.
Types are deposited in the Institute of Zoology, Chinese Academy of Sciences (
Thaiderces jian from Thailand, details and figures of the type species as in figs 1A, 2A, and
Thaiderces resembles Sinoderces by the absence of an apical protrusion on the cymbium, cheliceral lamina with 3 triangular extensions, shallow fovea, and clypeus and labium slanting, but it can be differentiated by the following combination of characters: 1) presence of embolic stalk or embolic ‘stubble’ (vs. absence of embolic stalk or ‘stubble’); 2) absence of setae on ocular region (vs. presence of numerous setae); 3) embolus shorter than bulb (vs. embolus longer than bulb); 4) absence of conductor (vs. presence); and 5) 3 retromarginal cheliceral teeth (vs. one retromarginal tooth).
Thaiderces jian (♂♀) (the type species), T. vulgaris (Deeleman-Reinhold, 1995) (♂♀), T. shuzi sp. nov. (♂♀), T. peterjaegeri sp. nov. (♂), T. ganlan sp. nov. (♂♀), T. ngalauindahensis sp. nov. (♂), T. yangcong sp. nov. (♂♀), T. tuoyuan sp. nov. (♂♀), T. fengniao sp. nov. (♂♀), T. haima sp. nov. (♂♀), T. thamphadaengensis sp. nov. (♂♀), T. thamphrikensis sp. nov. (♂♀), T. jiazi sp. nov. (♀), T. zuichun sp. nov. (♀), T. chujiao sp. nov. (♀), and T. miantiao sp. nov. (♀).
Thailand, Myanmar, and Sumatra Island of Indonesia.
1 | Embolic stubble absent | 2 |
– | Embolic stubble present | 7 |
2 | Embolus is shorter than bulb | 3 |
– | Embolus and bulb almost equal in length (Fig. |
T. ganlan sp. nov. |
3 | Embolus with long stalk | 4 |
– | Embolus without stalk | 5 |
4 | Bulb with lamina, embolic stalk with distinct inclination of 30° (Fig. |
T. ngalauindahensis sp. nov. |
– | Bulb without lamina, embolic stalk flat and tapering (Fig. |
T. thamphadaengensis sp. nov. |
5 | Embolus thin, straight and elongated, perpendicular to the axis of the bulb (Fig. |
T. peterjaegeri sp. nov. |
– | Embolus thick, curved and short, directed upward | 6 |
6 | Bulb obovate; embolus originating prolaterally (Fig. |
T. tuoyuan sp. nov. |
– | Bulb oblong; embolus originating retrolaterally (Fig. |
T. jian |
7 | Embolic stalk long | 8 |
– | Embolic stalk absent (Fig. |
T. yangcong sp. nov. |
8 | Embolic stubble divided into 2 rows | 9 |
– | Embolic stubble not divided | 10 |
9 | Bulb with lamina (Fig. |
T. fengniao sp. nov. |
– | Bulb without lamina (Fig. |
T. vulgaris |
10 | Embolic stubble serrated, covers the entire embolic stalk (Fig. |
T. shuzi sp. nov. |
– | Embolic stubble not serrated, covers only distal end of embolic stalk | 11 |
11 | Embolic stubble aligned, almost as wide as bulb (Fig. |
T. thamphrikensis sp. nov. |
– | Embolic stubble not aligned, 3 times thinner than bulb (Fig. |
T. haima sp. nov. |
Prolateral view of left bulb in Thaiderces species A T. jian B T. ngalauindahensis sp. nov. C T. peterjaegeri sp. nov. D T. tuoyuan sp. nov. E T. yangcong sp. nov. F T. fengniao sp. nov. Ventral view of the bulb in Thaiderces species G T. vulgaris H T. ganlan sp. nov. I T. thamphadaengensis sp. nov. J T. shuzi sp. nov. K T. thamphrikensis sp. nov. L T. haima sp. nov. Abbreviations: LA, laminal apophysis, ST, stubble. A, G Modified from
1 | One pair of spermathecae | 2 |
– | Two pairs of spermathecae | 7 |
2 | Spermathecae tubular, without stalks | 3 |
– | Spermathecae with stalks | 4 |
3 | Wavy ducts present medially, connected with tubular spermathecae laterally (Fig. |
T. thamprikensis sp. nov. |
– | Wavy ducts lacking, tubular spermathecae bend towards each other (Fig. |
T. fengniao sp. nov. |
4 | Spermathecae with twisted stalks | 5 |
– | Stalk of spermatheca not twisted or simply bent at a right angle | 6 |
5 | Spermathecae with globular heads 2 times wider than stalk (Fig. |
T. ganlan sp. nov. |
– | Spermathecae with globular heads 3 times wider than stalk (Fig. |
T. tuoyuan sp. nov. |
6 | Spermathecae connected by a funnel-like base (Fig. |
T. jiazi sp. nov. |
– | Spermathecae connected by a wavy horizontal duct (Fig. |
T. zuichun sp. nov. |
7 | Spermathecae without stalks, tubular | 8 |
– | Spermathecae with stalks, twisted | 11 |
8 | Paired spermathecae touching | 9 |
– | Paired spermathecae separated | .10 |
9 | Lateral spermathecae similar to median spermathecae but embedded with ovoid duct structure (Fig. |
T. haima sp. nov. |
– | Lateral spermathecae distinctly shorter and wider than median spermathecae (Fig. |
T. chujiao sp. nov. |
10 | Lateral spermathecae with stalks (Fig. |
T. thamphadaengensis sp. nov. |
– | Lateral spermathecae 2 times longer than median pair and directed horizontally (Fig. |
T. vulgaris |
11 | Lateral and median spermathecae of similar shape | 12 |
– | Lateral spermathecae short and tubular, median spermathecae long and twisted (Fig. |
T. jian |
12 | Spermathecae with globose heads | 13 |
– | Spermathecae without globose heads (Fig. |
T. yangcong sp. nov. |
13 | Heads of spermathecae 3 times wider than stalk (Fig. |
T. shuzi sp. nov. |
– | Heads of spermathecae almost equally as wide as stalk (Fig. |
T. miantiao sp. nov. |
Endogyne of Thaiderces species A T. jian B T. vulgaris C T. thamprikensis sp. nov. D T. fengniao sp. nov. E T. ganlan sp. nov. F T. tuoyuan sp. nov. G T. jiazi sp. nov. H T. zuichun sp. nov. I T. haima sp.nov. J T. chujiao sp. nov. K T. thamphadaengensis sp. nov. L T. yangcong sp. nov. M T. shuzi sp. nov. N T. miantiao sp. nov. Abbreviation: SP, spermathecae. A, B Modified from
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin shūzǐ (comb) and refers to the serrated stubble on the embolic stalk that resembles a comb.
Males of T. shuzi sp. nov. can be distinguished from all other species of the genus by the unique structure of the male bulb with a long embolic stalk bearing serrated embolic stubble (Fig.
Male (holotype). Total length 1.78; carapace 0.78 long, 0.70 wide; abdomen 1.00 long, 0.70 wide. Carapace round and pale yellow (Fig.
Female (Paratype). General features and coloration similar to that of male (Fig.
Known only from the type locality (Fig.
Holotype: ♂ (
The species is named in honor of Peter Jäger (Frankfurt am Main, Germany), a prolific spider taxonomist.
Males of T. peterjaegeri sp. nov. resemble those of T. ganlan sp. nov. but can be distinguished by the narrow oblong shape of the bulb (Fig.
Male (holotype). Total length 1.87; carapace 0.78 long, 0.75 wide; abdomen 1.09 long, 0.75 wide. Carapace round and brown, with 3 longitudinal brown bands, lateral bands 5 times wider than the middle band (Fig.
Female. Unknown.
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin gănlăn (olive) and refers to the structure of the bulb that resembles an olive or a rugby ball (Fig.
Diagnostic features of males are discussed under T. peterjaegeri sp. nov. Females of T. ganlan sp. nov. can be distinguished by a pair of twisted ribbon-liked spermathecae, with globular distal ends two times wider than stalk (vs. spermathecae with globular heads three times wider than stalk in T. tuoyuan sp. nov., Fig.
Male (holotype). Total length 1.63; carapace 0.63 long, 0.63 wide; abdomen 1.00 long, 0.75 wide. Carapace round and brown with 3 longitudinal brown bands, lateral bands three times wider than the median band (Fig.
Female (Paratype). General features and coloration similar to that of male (Fig.
Holotype: ♂ (
The species name is an adjective referring to the type locality.
Thaiderces ngalauindahensis sp. nov. is similar to T. rimbu, but males can be distinguished by lamina connected to the embolus (Fig.
Male (holotype). Total length 1.16; carapace 0.54 long, 0.55 wide; abdomen 0.62 long, 0.31 wide. Carapace round and brown, with three longitudinal dark brown bands, median band with distinct patch centrally, lateral bands four times wider than the middle band (Fig.
Female. Unknown.
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin yángcōng (onion) and refers to the entire structure of the bulb which resembles an onion bulb.
Thaiderces yangcong sp. nov. is similar to T. djojosudharmoi, but males can be distinguished by the thin and long embolus (vs. a thick and short embolus in T. djojosudharmoi), a rather plump and rounded bulb (vs. a rather ovate bulb), and the presence of embolic stubble (vs. absence of embolic stubble); females can be distinguished by a pair of short, twisted, and rather distant wavy spermathecae (vs. two pairs of short petal-like spermathecae that are close together in T. djojosudharmoi).
Male (holotype). Total length 1.95; carapace 0.70 long, 0.75 wide; abdomen 1.25 long, 0.90 wide. Carapace round and pale brown, with three longitudinal dark brown bands, median band only half the length of carapace, lateral bands three times wider than the middle band (Fig.
Female (paratype). General features and coloration similar to that of male (Fig.
Holotype: ♀ (
The species name is a noun in apposition derived from the Chinese pinyin zuǐchún (lip) and refers to the overall structure of the spermathecae which is similar to a human lip.
Thaiderces zuichun sp. nov. is similar to T. miantiao sp. nov. but can be easily distinguished by a pair of stalked spermathecae with an oblong distal part connected to a wavy horizontal duct (vs. two pairs of strongly twisted spermathecae in T. miantiao sp. nov.).
Female. Total length 1.58; carapace 0.50 long, 0.63 wide; abdomen 1.08 long, 0.78 wide. Carapace round and brown, with three longitudinal purplish bands, median band rather pale and only half the length of the carapace, lateral bands three times wider than the median band (Fig.
Male. Unknown.
Known only from the type locality (Fig.
Holotype: ♀ (
The species name is a noun in apposition derived from the Chinese pinyin miàntiáo (noodle) and refers to the spermathecae structure which resembles curly noodles (twisted structure).
See diagnosis for T. zuichun sp. nov.
Female. Total length 1.56; carapace 0.54 long, 0.60 wide; abdomen 1.02 long, 0.86 wide. Carapace round and brown, with two longitudinal dark brown bands laterally, and a central dark brown patch (Fig.
Male. Unknown.
Known only from the type locality (Fig.
Holotype: ♀ (
The species name is a noun in apposition derived from the Chinese pinyin jiázǐ (clamp) and refers to the spermathecae structure which resembles a face clamp (Fig.
Thaiderces jiazi sp. nov. can be distinguished from other species by the unique pattern on the carapace, with trident purplish stripes medially and purplish stripes laterally (Fig.
Female. Total length 1.47; carapace 0.54 long, 0.62 wide; abdomen 0.93 long, 0.65 wide. Carapace round and pale yellow, with trident purplish stripes medially and purplish stripes laterally. Chelicerae brown (Fig.
Male. Unknown.
Known only from the type locality (Fig.
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin tuŏyuán (oval) and refers to the ovoid shape of the bulb.
Thaiderces tuoyuan sp. nov. is similar to T. jian, but males can be distinguished by the obovate bulb (vs. oblong bulb in T. jian), the position of the entire bulb is a mirror image of that of T. jian but theembolus arises from the opposite position in the two species; females can be distinguished by having one pair of spermathecae (vs. two pairs in T. jian).
Male (holotype). Total length 1.40; carapace 0.54 long, 0.55 wide; abdomen 0.86 long, 0.54 wide. Carapace round and brown, with three longitudinal dark brown bands of nearly equal width (Fig.
Female (Paratype). General features and coloration similar to that of male (Fig.
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin fēngniăo (hummingbird) and refers to the entire structure of the bulb, including the embolic stalk and laminar apophysis, resembling the head of a hummingbird.
Thaiderces fengniao sp. nov. is similar to T. haima sp. nov. but can be distinguished by a lighter color of pale yellow and purplish pattern as a whole (vs. rather darker color of brown pattern as a whole in T. haima sp. nov.), the embolic stubble is divided into two rows (Fig.
Male (holotype). Total length 1.70; carapace 0.80 long, 0.78 wide; abdomen 0.90 long, 0.50 wide. Carapace round and brown, with 3 longitudinal dark brown bands, lateral bands four times wider than the median band (Fig.
Female (Paratype). General features and coloration similar to that of male (Fig.
Holotype: ♂ (
The species name is a noun in apposition derived from the Chinese pinyin hăIimă (seahorse) and refers to the distal bending of bulb that resembles the head of a seahorse.
See diagnosis of T. fengniao sp. nov.
Male (holotype). Total length 1.80; carapace 0.60 long, 0.70 wide; abdomen 1.20 long, 0.90 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands two times wider than the median band (Fig.
Female (paratype). General features and coloration similar to that of the male (Fig.
Holotype: ♀ (
The species name is a noun in apposition derived from the Chinese pinyin chùjiăo (antenna) and refers to the structure of the spermathecae that resembles two pairs of clavate antennae (Fig.
Thaiderces chujiao sp. nov. can be distinguished from other species by the two pairs of tubular spermathecae resembling two pairs of clavate antennae, lateral pair half the length of the median pair (Fig.
Female (holotype). Total length 1.62; carapace 0.60 long, 0.70 wide; abdomen 1.02 long, 0.60 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands three times wider than the median band. Chelicerae brown (Fig.
Male. Unknown.
Known only from the type locality (Fig.
Holotype: ♂ (
The species name is an adjective referring to the type locality.
Thaiderces thamphadaengensis sp. nov. can be distinguished from other species of the genus by the distinct long, flat and tapered embolic stalk (vs. embolic stalk not flat and tapered in other congeners); females can be distinguished by two pairs of spermathecae, lateral pair with short stalks, median pair circular (vs. one pair of similar spermathecae, tubular or twisted spermathecae in other congeners).
Male (holotype). Total length 1.30; carapace 0.60 long, 0.59 wide; abdomen 0.70 long, 0.44 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands three times wider than the median band (Fig.
Female (paratype). General features and coloration similar to that of male (Fig.
Holotype: ♂ (
The species name is an adjective referring to the type locality.
Thaiderces thamphrikensis sp. nov. is similar to T. vulgaris but can be distinguished by a short embolus (embolus tip does not exceed the perimeter or bulb) (Fig.
Male (holotype). Total length 1.62; carapace 0.62 long, 0.70 wide; abdomen 1.00 long, 0.55 wide. Carapace round and brown, with three longitudinal dark brown bands, lateral bands almost equally wide with the median band (Fig.
Female (paratype). General features and coloration similar to that of male (Fig.
Psiloderces rimbu Deeleman-Reinhold, 1995: 25, figs 54, 55.
Described by
Indonesia.
This species is transferred to Thaiderces due to the similarity of somatic morphology and diagnostic features of the type species of the genus.
Psiloderces djojosudharmoi Deeleman-Reinhold, 1995: 21, figs 38–42.
Described by
Indonesia.
The somatic morphology and diagnostic features are similar to the type species of the genus; therefore, we transfer it to Thaiderces.
Chelicerale retromargin, posterior view A Thaiderces thamphrikensis sp. nov. B T. yancong sp. nov. C T. shuzi sp. nov. D T. fengniao sp. nov. E T. peterjaegeri sp. nov. F T. ngalauindahensis sp. nov. G T. zuichun sp. nov. H T. miantiao sp. nov. I T. jiazi sp. nov. Abbreviations: CL, cheliceral lamina, RT, retromarginal teeth.
Distribution of Thaiderces species in Southeast Asia. 1 T. thamphrikensis sp. nov. 2 T. yangcong sp. nov. 3 T. shuzi sp. nov. 4 T. fengniao sp. nov. 5 T. peterjaegeri sp. nov. 6 T. ngalauindahensis sp. nov. 7 T. zuichun sp. nov. 8 T. jiazi sp. nov. 9 T. chujiao sp. nov. 10 T. tuoyuan sp. nov. 11 T. haima sp. nov. 12 T. thamphadaengensis sp. nov. 13 T. ganlan sp. nov. 14 T. miantiao sp. nov. 15 T. jian 16 T. vulgaris. Two species not included: T. rimbu, T. djojosudharmoi.
The manuscript benefited greatly from comments by Yuri M. Marusik (Magadan, Russia), and anonymous reviewers. Sarah Crews (San Francisco, USA) kindly checked the language. Peter Jäger (Frankfurt am Main, Germany) collected Thaiderces peterjaegeri sp. nov. which is named in his honor. This study was supported by the National Natural Science Foundation of China to Shuqiang Li (NSFC-31530067).