Ischnothyreus yueluensis Yin & Wang, 1984

Huang, Ying, Tong, Yanfeng, Bian, Dongju & Li, Shuqiang, 2021, One new species of the genus Ischnothyreus Simon, 1893 and re-description of I. yueluensis Yin & Wang, 1984 from China (Araneae, Oonopidae), Biodiversity Data Journal 9, pp. 66843-66843 : 66843

Ischnothyreus yueluensis Yin & Wang, 1984

Materials

Type status: Other material. Occurrence: individualID: SYNU-450-454; individualCount: 5; sex: 2 males, 3 females; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin and Wang , 1984; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; countryCode: CHN; stateProvince: Guangxi Zhuang Autonomous Region ; county: Chongzuo City , Pingxiang City ; locality: Nan Station , Sanzhi Cave ; verbatimElevation: 257 m a.s.l.; verbatimLatitude: 22 º 04.540'N; verbatimLongitude: 106 º 44.264'E; Identification : identifiedBy: Yanfeng Tong ; Event : eventDate: 7 May 2015 Type status: Other material. Occurrence: individualID: SYNU-455; individualCount: 1; sex: female; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin & Wang, 1984; order: Araneae; family: Oonopidae; genus: Ischnothyreus; Location: country: China; countryCode: CHN; stateProvince: Guangxi Zhuang Autonomous Region; county: Hechi City, Fengshan County; locality: Fengcheng Town , Songren Village , Xi'an Cave ; verbatimElevation: 574 m a.s.l.; verbatimLatitude: 24 º 34.272'N; verbatimLongitude: 107 º 02.940'E; Identification : identifiedBy: Yanfeng Ton ; Event : eventDate: 27 September 2015 Type status: Other material. Occurrence: individualID: SYNU-456-458; individualCount: 3; sex: female; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin & Wang, 1984; order: Araneae; family: Oonopidae; genus: Ischnothyreus; Location: country: China; countryCode: CHN; stateProvince: Guangxi Zhuang Autonomous Region; county: Nanning City; locality: Suxu Town, Mu Village , outside the Eighteen Luohan Cave ; verbatimElevation: 196 m a.s.l.; verbatimLatitude: 22 º 32.600'N; verbatimLongitude: 108 º 03.390'E; Identification: identifiedBy: Yanfeng Tong; Event: eventDate: 9 May 2015 Type status: Other material. Occurrence: individualID: SYNU-474; individualCount: 1; sex: male; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin & Wang, 1984; order: Araneae; family: Oonopidae; genus: Ischnothyreus; Location: country: China; countryCode: CHN; stateProvince: Guangxi Zhuang Autonomous Region; county: Hechi City, Donglan County; locality: Simeng Town , an unnamed Cave ; verbatimElevation: 464 m a.s.l.; verbatimLatitude: 24 º 30.071'N; verbatimLongitude: 107 º 16.181'E; Identification : identifiedBy: Yanfeng Tong ; Event : eventID: 19 March 2015 Type status: Other material. Occurrence: individualID: SYNU-459; individualCount: 1; sex: female; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin & Wang, 1984; order: Araneae; family: Oonopidae; genus: Ischnothyreus; Location: country: China; countryCode: CHN; stateProvince: Guangxi Zhuang Autonomous Region ; county: Guilin City; locality: Qixing Park, Qixingyan ; verbatimElevation: 257 m a.s.l.; verbatimLatitude: 25 º 16.330'N; verbatimLongitude: 110 º 18.25'E; Identification: identifiedBy: Yanfeng Tong; Event: eventDate: 7 January 2013 Type status: Other material. Occurrence: individualID: HNNU-YLS-17-0210; individualCount: 2; sex: 1 male, 1 female; lifeStage: adult; preparations: whole animal; disposition: in collection; Taxon: scientificName: Ischnothyreus yueluensis; namePublishedIn: Yin & Wang, 1984; order: Araneae; family: Oonopidae; genus: Ischnothyreus; Location: country: China; countryCode: CHN; stateProvince: Hunan Province; county: Changsha City; locality: Yuelu Mountain Scenic Area ; verbatimElevation: 151 m a.s.l.; verbatimLatitude: 28 º 11.146'N; verbatimLongitude: 112 º 56.514'E; Event: eventDate: 17 February 2017

Description

Male (SYNU-450) (in mm). Body: habitus as in Fig. 4 A, C and E; body length 1.45. Carapace (Fig. 4 B, E and F): 0.76 long, 0.56 wide; brown, with egg-shaped patches behind eyes, ovoid in dorsal view, profile elevated, surface of elevated portion of pars cephalica smooth, sides strongly reticulate, lateral margins straight, smooth. Clypeus (Fig. 4 F): rounded, slightly protruding, height about 0.80 times of ALE diameter. Eyes (Fig. 4 B and F): six, well developed, ALE largest, PLE smallest, posterior eye row straight from above, procurved from front. Sternum (Fig. 4 D): pale orange, longer than wide. Mouthparts (Fig. 4 D and G-I; Fig. 5 L): chelicerae, endites and labium orange; chelicerae straight, base of fangs with small stick-shaped sclerotised process, fang groove with field of small denticles; anteromedian tip of endites with one strong, tooth-like projection. Abdomen: 0.75 long, 0.46 wide; dorsal scutum well sclerotised, pale orange, covering 4/5 of abdomen width and approximately 5/6 of abdomen length, unfused to epigastric scutum; epigastric and postgastric scutum well sclerotized, pale orange, fused, postgastric scutum covering about 2/3 of abdomen length. Legs: pale orange, femur I with 2 prolateral spines, tibia I with 4 pairs, metatarsus I with 2 pairs of long ventral spines. Leg II spination similar to leg I, except femur with only 1 prolateral spine. Legs III and IV spineless. Sperm pore large, oval, situated at level of anterior spiracles. Palp (Fig. 5 A-K): trochanter with ventral projection; femur normal size; patella about as long as femur, not enlarged; tibia with three trichobothria; cymbium fused with bulb; bulb with 2 ventral protuberances, one large and another very small, distal end elongated, with a prolateral lobe and several leaf-shaped membranes, retrolateral lobe small.

Female (SYNU-452) (in mm): same as male, except as noted. Body: habitus as in Fig. 6 A, C and D; body length 1.49. Carapace: 0.67 long, 0.53 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 0.84 long, 0.58 wide; dorsal scutum covering 1/2 of abdomen length, about 3/4 of abdomen width. Epigastric area: surface without external features. Endogyne (Fig. 6 I): from middle of slightly thickened margin of postgastric scutum runs a dark, simple winding tube, ending in a small, narrow bowl-shaped sclerotised entension; posteriorly directed apodemes present.

Diagnosis

This species is similar to Ischnothyreus concavus Richard, 2016 in the stick-shaped sclerotized process on the male fang base, but can be distinguished by the prolateral lobe (Fig. 5 I) of palpal bulb, which is lacking in Ischnothyreus concavus ( Richard et al. 2016: fig. 33) and the epigastric area (unmodified (Fig. 6 H) vs. with central goggle-shaped process ( Richard et al. 2016: figs. 36B, C and D)).

Distribution

China (Hunan, Guangxi) (Fig. 7 ).

Figures

Figure 4. Ischnothyreus yueluensis Yin & Wang, 1984, male (SYNU- 450) A. habitus, dorsal view; B. prosoma, dorsal view; C. habitus, ventral view; D. prosoma, ventral view; E. habitus, lateral view; F. prosoma, anterior view; G. left chelicerae, anterior view; H. left chelicerae, lateral view; I. left chelicerae, posterior view. Abbreviations: sp = stick-shaped process, stp = strong, tooth-like projection. Scale bars: 0.4 (A-F) and 0.05 (G-I).

Figure 5. Ischnothyreus yueluensis Yin & Wang, 1984, male (SYNU- 450), light (A-C) and SEM (D-L) microphotographs. A. left palp, prolateral view; B. left palp, dorsal view; C. left palp, retrolateral view; D. left palp, prolateral view; E. left palp, retrolateral view; F. left palp, dorsal view; G. palpal bulb, prolateral view; H. palpal bulb, retrolateral view; I. distal part of palpal bulb, dorsal view; J. distal part of palpal bulb, prolateral view; K. distal part of palpal bulb, retrolateral view; L. left chelicerae, posterior view. Abbreviations: dlm = dorsal leaf-shaped membrane, pl = prolateral lobe, plm = prolateral leaf-shaped membrane, rl = retrolateral lobe, sp = stick-shaped sclerotised process, vp = ventral projection, vpr = ventral protuberances. Scale bars: 0.1 (A-F), 0.05 (G, H) and 0.02 (I-L).

Figure 6. Ischnothyreus yueluensis Yin & Wang, 1984, female (SYNU- 452) A. habitus, dorsal view; B. prosoma, dorsal view; C. habitus, ventral view; D. habitus, lateral view; E. prosoma, ventral view; F. epigastric region, ventral view; G. prosoma, anterior view; H. endogyne, ventral view; I. endogyne, dorsal view. Abbreviations: a = apodemes, bse = bowl-shaped sclerotised extension, wt = winding tube. Scale bars: 0.4 (A-E, G), 0.2 (F) and 0.1 (H, I).

Figure 7. Distribution of two Ischnothyreus species from China. 1. I. yunlong sp. n. 2. I. yueluensis Yin & Wang, 1984.