Biodiversity Data Journal 11: e102450 CO)
doi: 10.3897/BDJ.11.e102450 open access
Taxonomy & Inventories

A new species of Siamspinops Dankittipakul &
Corronca, 2009 from Guizhou, China
(Araneae, Selenopidae)

Cheng Wang}, Jiahui Gant, Mi Xiaogi*

$ Guizhou Provincial Key Laboratory for Biodiversity Conservation and Utilization in the Fanjing Mountain Region,
Tongren University, Tongren, China

Corresponding author: Cheng Wang (wchengspider@163.com)

Academic editor: Alireza Zamani

Received: 21 Feb 2023 | Accepted: 10 Apr 2023 | Published: 18 Apr 2023

Citation: Wang C, Gan J, Xiaogi M (2023) A new species of Siamspinops Dankittipakul & Corronca, 2009 from
Guizhou, China (Araneae, Selenopidae). Biodiversity Data Journal 11: e102450.
https://doi.org/10.3897/BDJ.11.e102450

ZooBank: urn:lsid:zoobank.org:pub:700F82F 7-C2F4-4D34-8F 19-88713D1A64B3

Abstract
Background

The wall crab spider genus Siamspinops Dankittipakul & Corronca, 2009 contains eight
species restricted to South and Southeast Asia, of which two are recorded from China.

New information

A new species, Siamspinops yejiei sp. n., is diagnosed and described based on both
sexes from Foding Mountain National Nature Reserve, Guizhou, China. Diagnostic photos
of the habitus and copulatory organs and a distributional map are provided.

Keywords

East Asia, morphology, taxonomy, wall crab spider

© Wang C et al. 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.

2 Wang C et al

Introduction

The selenopid spider genus Siamspinops Dankittipakul & Corronca, 2009 is diagnosed by
the presence of at least 11 ventral spines on tibiae | and Il and seven ventral spines on
metatarsi | and Il (Dankittipakul and Corronca 2009). It is represented by eight species
primarily distributed in tropical areas of South and Southeast Asia, including two recorded
from China. Although all of the species are known from diagnostic illustrations, six of them
are known only from original descriptions and half of them are known only from females,
indicating that further taxonomic studies and more collecting efforts over a broader area
are necessary (World Spider Catalog 2023).

In our recent study of the samples collected from Foding Mountain, two selenopid species
have been found. One was identified as Selenops bursarius Karsch, 1879 and the other
was identified as an undescribed species of the genus Siamspinops, which is described
and illustrated herein. The discovery has revealed that Siamspinops is not restricted to
tropical areas and that there may be undiscovered diversity in temperate regions.

Materials and methods

All specimens are deposited in the museum of Tongren University, Tongren, China. The
specimens were examined with an Olympus SZX10 stereomicroscope. After dissection, the
epigynes were cleared in a trypsin enzyme solution before examination and imaging. The
left male palp was used for the description and illustrations. Photographs of the copulatory
organs and habitus were taken with a Kuy Nice CCD mounted on an Olympus BX43
compound microscope. Compound focus images were generated using Helicon Focus v.
6.7.1.

Measurements are given for the female holotype and male paratype in millimetres. Leg
measurements are given as: total length (femur, patella, tibia, metatarsus, tarsus).
References to figures in the cited papers are listed in lowercase type (i.e. fig. or figs.);
figures in this paper are noted with an initial capital (i.e. Fig. or Figs.). Palp terminology
follows those of Lin et al. (2022) and epigyne terminology follows those of Crews (2023).
Abbreviations used in the text and figures are as follows: AB accessory bulb; ALE anterior
lateral eye; AME anterior median eye; C conductor; CD copulatory duct; CO copulatory
opening; dRTA dorso-retrolateral tibial apophysis; E embolus; EP epigynal pocket; FD
fertilisation duct; MA median apophysis; ML median lobe; PLE posterior lateral eye; PME
posterior median eye; VRTA vento-retrolateral tibial apophysis; S spermatheca.

A new species of Siamspinops Dankittipakul & Corronca, 2009 from Guizhou, ... 3

Taxon treatment

Siamspinops yejiei Wang, Gan & Mi, sp. n.

ZooBank 8E69025B-3A3D-43D3-BFC7-31EA2B5CD7CA
Materials

Holotype:

a. scientificName: Siamspinops yejiei; country: China; stateProvince: Guizhou; county:
Shiqian; locality: Ganxi Township, Fuyan Village; verbatimElevation: 800-900 m;
verbatimLatitude: 27°21.46'N; verbatimLongitude: 108.2.03'E; year: 2020; month: June;
day: night of 20; habitat: stone wall; sex: female; identifiedBy: Cheng Wang;
occurrence!D: 0E1ACA16-D1C7-548F-A801-BEA5051675B1

Paratype:

a. scientificName: Siamspinops yejiei; country: China; stateProvince: Guizhou; county:
Shiqian; locality: Ganxi Township, Fuyan Village; verbatimElevation: 800-900 m;
verbatimLatitude: 27°21.46'N; verbatimLongitude: 108.2.03'E; year: 2020; month: June;
day: night of 20; habitat: stone wall; sex: 1 male, 1 female; identifiedBy: Cheng Wang;
occurrence!D: 0373C481-7FF2-520B-BBC9-9F083D3ED418

Description

Female (Holotype, TRU-SN-005, Fig. 2A, C, E, F, H; paratype, TRU-SN-006, Fig. 2B,
D). Total length 7.47. Carapace 2.94 long, 3.28 wide. Abdomen 4.79 long, 3.70 wide.
Eye sizes: AME 0.16, ALE 0.09, PME 0.17, PLE 0.21. Leg measurements: | 9.70 (2.80,
1.15, 2.65, 2.10, 1.00), Il 11.75 (3.75, 1.30, 3.20, 2.50, 1.00), Ill 12.75 (4.05, 1.30, 3.95,
2.45, 1.00), IV 9.90 (3.50, 1.00, 2.45, 2.00, 0.95). Carapace pear-shaped, yellow to
brown, with slightly elevated cephalic region bearing a pair of oblique brown stripes
behind PMEs and oval thoracic region bearing pairs of irregular, brown patches
mediolaterally. Chelicerae yellow, each with three promarginal and two retromarginal
teeth. Endites slightly longer than wide. Labium almost trapeziform. Sternum almost
oval, with straight anterior margin, covered with brown setae. Legs pale to yellow,
mingled with green-brown patches, with three (1-1-1) dorsal spines, two (1-1-0)
prolateral spines on femora | and 15 (1-2-2-2-2-2-2-2) and 10 (2-2-2-2-2) ventral spines
on tibiae and metatarsi | and Il, respectively. Abdomen elongate-oval, dorsum grey,
mingled with dark brown spots and patches, covered with short setae; venter pale to
brown, with dark margin. Epigyne (Fig. 2A—D): longer than wide, with broad, postero-
marginally located pocket and sub-oval lobe in median field; copulatory openings
beneath postero-lateral atrial margins; accessory bulb straight, bar-shaped, anteriorly
extending; copulatory ducts long, strongly convoluted, forming six or seven coils;
spermathecae elongated, obliquely extending.

Male (paratype, TRU-SN-007, Fig. 1A—C, Fig. 2G). Total length 6.30. Carapace 2.9
long, 3.2 wide. Abdomen 3.74 long, 2.7 wide. Eye sizes: AME 0.16, ALE 0.09, PME
0.16, PLE 0.20. Leg measurements: | 9.90 (2.85, 1.15, 2.65, 2.10, 1.15), Il 11.90 (3.70,
1.25, 3.25, 2.50, 1.20), Ill 13.15 (4.00, 1.25, 4.25, 2.40, 1.25), IV 9.60 (2.80, 1.15, 2.50,

Wang C et al

2.15, 1.00). Habitus similar to that of female, but paler and covered with dense setae
on carapace and only with 13 ventral spines on tibiae | and 14 on tibiae II. Palp (Fig. 1
A, B): tibia slightly longer than wide, bearing long setae retrolatero-dorsally, with
straight, apically blunt VRTA about equal in length to the width of dRTA in ventral view
and flat, tapered dRTA with pointed tip directed towards about 45 degrees in ventral
view; cymbium setose; bulb flat, almost round; conductor almost T-shaped, tip
sclerotised, pointed; median apophysis anteroprolateral to embolic base, curved
inwards distally; embolus curved into a circle, with small, serrated processes at base.

Figure 1. EES]

Male palp and chelicera of Siamspinops yejiei sp. n., paratype. A palp, ventral; B ditto,
retrolateral; C chelicera, posterior. Scale bars: 0.2 mm.

Diagnosis

Siamspinops yejiei sp. n. closely resembles S. banna Lin & Li, 2022 in having a very
similar epigynal pocket and male palp, but it can be distinguished by the following: 1)
the accessory bulb (described as spermathecal head in Lin et al. (2022)) does not
extend anteriorly beyond the copulatory ducts in dorsal view (Fig. 2C, D), versus
extends beyond the copulatory ducts in S. banna (Lin et al. 2022: fig. 36B); 2) the
epigynal pocket is about 1/3 the epigynal width (Fig. 2A, B), versus about 1/2 the
epigynal width in S. banna (Lin et al. 2022: fig. 36A); 3) the embolus has serrated
processes at the base (Fig. 1B, see the red arrow), versus absent in S. banna (Lin et
al. 2022: fig. 35B); 4) the median apophysis is widest at the base in ventral view (Fig. 1
A), versus widest medially in S. banna (Lin et al. 2022: fig. 35A); 5) tip of the conductor

A new species of Siamspinops Dankittipakul & Corronca, 2009 from Guizhou, ... 5

is prolateral to the retrolateral margin of bulb in ventral view (Fig. 1A), whereas it is
retrolateral to the retrolateral margin of bulb (Lin et al. 2022: fig. 35A); 6) the male
chelicera has two retromarginal teeth (Fig. 1C), versus just one in S. banna (see the
description in Lin et al. (2022)).

Figure 2. EES

Siamspinops yejiei sp. n., A, C, E, F, H female holotype; B, D female paratype; G male
paratype. A, B epigyne, ventral; C, D vulva, dorsal; E, G habitus, dorsal; F ditto, ventral; H
tibiae, metatarsi and tarsi of left legs | and II, ventral. Scale bars: 0.2 mm (A=D); 1.0 mm
(E-H).

Etymology

The species is named after Mr. Yejie Lin, who guided us through the method of taking
photographs and helped with species identification; noun (name) in genitive case.
Distribution

China (Guizhou) (Fig. 3).

6 Wang C et al

Chongqing

Yunnan
“a Guangxi

130 260 Kilometers

Figure 3. EES

The type locality of Siamspinops yejiei sp. n.

Acknowledgements

The manuscript benefited greatly from comments by Alireza Zamani (Turku, Finland),
Sarah C. Crews (San Francisco, USA) and John T.D. Caleb (Tamil Nadu, India). This
research was supported by the National Natural Science Foundation of China
(NSFC-31972869, 31660609, 32200369), the Science and Technology Project Foundation
of Guizhou Province ([2020]1Z014), the Key Laboratory Project of Guizhou Province
([2020]2003), the Doctoral Research Foundation of Tongren University (trxyDH2102) and
the Natural Science Research Project Foundation of Guizhou Province of Education [grant
number KY[2019]168].

References

° Crews SC (2023) But wait, there’s more! Descriptions of new species and undescribed
sexes of flattie spiders (Araneae, Selenopidae, Karaops) from Australia. ZooKeys 1150:
1-189. https://doi.org/10.3897/zookeys.1150.93760

° Dankittipakul P, Corronca JA (2009) Siamspinops, a new selenopid genus from
Southeast Asia (Arachnida, Araneae. Organisms Diversity & Evolution 9 (1): 69 1-69 12.
https://doi.org/10.1016/j.ode.2008.10.006

° Lin YJ, Zhao HF, Koh JK, Li SQ (2022) Taxonomy notes on twenty-eight spider species
(Arachnida: Araneae) from Asia. Zoological Systematics 47 (3): 198-270. httos://doi.org/
10.11865/zs.2022303

° World Spider Catalog (2023) World Spider Catalog. Version 24. Natural History
Museum Bern. hitp:/Awsc.nmbe.ch. Accessed on: 2023-2-01.