Atypus jianfengensis, Li, Fan, Xu, Xin, Zhang, Zengtao, Liu, Fengxiang, Zhang, Hongli & Li, Daiqin, 2018

Li, Fan, Xu, Xin, Zhang, Zengtao, Liu, Fengxiang, Zhang, Hongli & Li, Daiqin, 2018, Two new species of the purse-web spider genus Atypus Latreille, 1804 from Hainan Island, China (Araneae, Atypidae), ZooKeys 762, pp. 47-57 : 47

Atypus jianfengensis sp. n. Figs 4, 5

Type material.

Holotype female (HN-2017-010): CHINA: Hainan Province: Ledong County, Jianfengling, Nantianchi, 18.74°N, 108.86°E, 823 m elevation, collected on 2 August 2017 by X. Xu, F. Liu, Z. Zhang, and D. Li (CBEE).

Paratypes.

4 females (HN-2017-003, HN-2017-005, HN-2017-007, HN-2017-008), collected at the same locality as the holotype, 2 August 2017 by X. Xu, F. Liu, Z. Zhang, and D. Li (CBEE). Male unknown.

Etymology.

The specific name refers to the type locality.

Diagnosis.

The female genitalia of the new species is similar to that of A. karschi Dönitz, 1887, but can be distinguished from the latter by the basal stalks of median pair of receptacula almost being as long as the diameter of their receptacula and much longer than the basal stalks of lateral pair (Fig. 4 D–E); first pair of sigilla irregular shape (Fig. 4B).

Description.

Female (holotype).TL (including chelicerae) 18.74. CL 5.50, CW 4.97, AL 8.58, AW 5.98. Carapace red-brown. Eye region black. Eye diameters: AME 0.30, ALE 0.15, PME 0.16, PLE 0.14. Distances: AME–AME 0.27, AME–ALE 0.20, PME–PME 1.06, PME–PLE 0.12. MOA 0.29, front width 0.87, back width 1.38. Fovea transverse, occupying about 1/7 of carapace width at that point (Fig. 4A). Chelicerae orange red with 15 teeth on the promargin in a single row, two from apex small, basal three smallest (Fig. 4C). Labium wider than long, with a curved line marked in the middle. Sternum (Fig. 4B) light orange-brown, 4.80 long, 3.76 width, smooth, with scattered black hairs; sigilla deeply imprinted, first pair anteriorly pointed and irregular; fourth pair sub-oval, separated by nearly their width.

Abdomen, oval and medium brown (Fig. 5B), with a yellow dark dorsal tergite on anterior half. ALS 0.61, PMS 1.12, four-segmented PLS with lengths as follows: basal 0.77, median 0.69, subapical 0.62, apical 0.42, total 2.5.

Spines on all metatarsus; metatarsus IV with eleven dorsal spines. Leg formula: 1423.

Vulva (Fig. 4 D–E): Genital atrium very short, pore patches large and rounded, the median pair of receptacula attached to the atrium more basally; the basal stalks of median pair of receptacula almost being as long as the diameter of their receptacula and much longer than the basal stalks of lateral pair.

Variation.

Size range of females: carapace length 4.47-5.68, carapace width 4.02-5.15, total length 17.52-18.74, n = 5. Basal stalks of lateral pair of receptacula are much shorter in some specimens (Fig. 4E).

Habitat.

Purse webs were found attached to the base of pine trees.

Distribution.

Hainan Island (Jianfeng Mountain), China

GenBank accession numbers.

HN-2017-003: MH279550; HN-2017-005: MH279551; HN-2017-007: MH279552; HN-2017-008: MH279553; HN-2017-010: MH279554.

Remarks.

Although A. jianfengensis sp. n. is collected from Ledong County, Hainan Island, it can be diagnosed from A. ledongensis found at the same area, Jianfeng mountains, by the latter having very short basal stalks of median pair of receptacula. In addition, it can be distinguished from A. baotingensis sp. n. by the latter having upper incrassate basal stalks of the median pair of receptacula. The intraspecific genetic distance for A. jianfengensis sp. n. based on both the mean Kimura 2-parameter distance (K2P) and p-distance is 1.4% and 1.0%, respectively. The molecular data also provide the evidence that A. jianfengensis sp. n. can be distinguished from A. baotingensis sp. n. as well as from A. ledongensis : the interspecific genetic distance based on K2P and p-distance for the two new species are 15.4% and 13.8%, respectively, and between A. jianfengensis sp. n. and A. ledongensis are 17.2% and 15.3%, respectively.