Ischnothyreus daheling Tong & Zhang, 2024

Song, Chenxue, Tong, Yanfeng, Bian, Dongju & Zhang, Zhisheng, 2024, Two new species and one new record of Ischnothyreus Simon, 1893 (Araneae, Oonopidae) from China, Biodiversity Data Journal 12, pp. 122100-122100 : 122100

Ischnothyreus daheling Tong & Zhang sp. nov.

Materials

Type status: Holotype. Occurrence: recordNumber: SYNU-707; recordedBy: Zongxu Li , Luyu Wang ; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: A9E7AAC7-43DA-5861-B070-AA367E644B62; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City , Tengchong County; locality: JietouTown , Datou Village , Dahelingganjiao ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 23/02/ 2011 Type status: Paratype. Occurrence: recordNumber: SYNU-708-710; recordedBy: Zongxu Li , Luyu Wang ; individualCount: 3; sex: female; lifeStage: adult; occurrenceID: 0FD72221-D529-5328-9438-36EDCECCEE10; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City , Tengchong County; locality: JietouTown , Datou Village , Dahelingganjiao ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 23/02/ 2011 Type status: Paratype. Occurrence: recordNumber: SYNU-711-714; recordedBy: Zongxu Li , Luyu Wang ; individualCount: 4; sex: female; lifeStage: adult; occurrenceID: A39B8642-53DA-5493-82BD-1968E6544502; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City , Tengchong County; locality: Jietou Town , Datang Village ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 21/02/ 2011 Type status: Paratype. Occurrence: recordNumber: SYNU-715-717; recordedBy: Zongxu Li , Luyu Wang ; individualCount: 3; sex: female; lifeStage: adult; occurrenceID: F489D23E-11EB-5FC1-ACD9-A3F0EBA8AB8B; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City , Tengchong County; locality: Wuhe Town , Xiaodifang Village ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 27/02/ 2011 Type status: Paratype. Occurrence: recordNumber: SYNU-718; recordedBy: Zongxu Li , Luyu Wang ; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: 6DFAC351-F3D7-5037-8495-2316D4E4E770; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City , Tengchong County; locality: Jietou Town , Sabadi ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 25/05/ 2011 Type status: Paratype. Occurrence: recordNumber: SYNU-719; recordedBy: Ping Feng; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: AC048212-9E5A-59B5-8D18-EFB379F11EDE; Taxon : scientificName: Ischnothyreus daheling; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; locality: Gaoligong Mountain , Nankang Protection Station ; Identification : identifiedBy: Yanfeng Tong ; Event : eventDate: 20/04/2011

Description

Male (Holotype). Body: habitus as in Fig. 1 A-C; body length 1.64. Carapace: 0.88 long, 0.65 wide; yellow, oval in dorsal view, pars cephalica strongly elevated in lateral view, sur-face of elevated portion of pars cephalica reticulate, sides finely reticulate, lateral margin straight, smooth (Fig. 1 C). Clypeus: straight in frontal view, ALE separated from edge of carapace by 1.5 times of their diameter (Fig. 1 F). Eyes: ALE largest, ALE circular, PME circular, PLE oval; posterior eye row recurved from above; ALE separated by less than their radius, ALE and PLE touching. Sternum: as long as wide, pale orange (Fig. 1 E). Mouthparts: chelicerae, endites and labium yellow; chelicerae straight, base of fangs with flag-like process, fang groove with a few small and one larger denticles (Fig. 2 J-L); an-teromedian tip of endites with one strong, tooth-like projection (Fig. 1 G). Abdomen: 0.76 long, 0.44 wide; dorsal scutum well sclerotised, dark brown, covering 4/5 of the abdomen width and approximately 5/6 of the abdomen length, not fused to epigastric scutum; epigastric and postepigastric scutum pale orange, fused, covering 3/4 of the 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. Palp: trochanter without ventral projection; bulb with 1 ven-tral protuberance, distal end of bulb stout (Fig. 2 A-I).

Female (paratype, SYNU-708). Same as male, except as noted. Habitus as in Fig. 3 A-C. Body: 1.82 long. Carapace: 0.81 long, 0.66 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 1.24 long, 0.79 wide; dorsal scutum approximately 1/3 of the abdomen length. Epigastric area: postepigastric scutum with inverted bell-shaped structure (Fig. 3 G and H). Endogyne: winding tube simple, strongly convoluted; lateral apodemes present (Fig. 3 I).

Diagnosis

This species is similar to Ischnothyreus yueluensis Yin & Wang, 1984 in the size of the abdominal scuta, but can be distinguished by the flag-shaped sclerotised process of cheliceral fang (Fig. 2 J) vs. small stick-shaped sclerotised process ( Huang et al. 2021: fig. 4G), the stout distal end of bulb (Fig. 2 G and H) vs. elongated distal end, with several leaf-shaped membranes ( Huang et al. 2021: figs. 5G and H) and the inverted bell-shaped structure of postepigastric scutum of female (Fig. 3 G) vs. small, narrow bowl-shaped structure ( Huang et al. 2021: fig. 6H).

Etymology

The specific epithet is a noun in apposition taken from the type locality.

Distribution

Known only from the type locality.

Figures

Figure 1. Ischnothyreus daheling sp. nov., male holotype. A habitus, dorsal view; B habitus, ventral view; C habitus, lateral view; D prosoma, dorsal view; E prosoma, ventral view; F prosoma, anterior view; G left chelicera, anterior view; H left chelicera, lateral view; I left chelicera, posterior view. Abbreviation: stp = strong, tooth-like projection. Scale bars: A-F = 0.4 mm; G-I = 0.1 mm.

Figure 2. Ischnothyreus daheling sp. nov., male holotype, light (A-C) and SEM (D-L) images. A left palp, prolateral view; B left palp, retrolateral view; C left palp, dorsal view; D left palp, prolateral view; E left palp, retrolateral view; F left palp, dorsal view; G distal part of palpal bulb, prolateral view; H distal part of palpal bulb, retrolateral view; I distal part of palpal bulb, dorsal view; J left chelicera, anterior view; K left chelicera, posterior view; L left chelicera, lateral view. Abbreviation: fp = flag-shaped process. Scale bars: A-F = 0.4 mm; G-L = 0.1 mm.

Figure 3. Ischnothyreus daheling sp. nov., female paratype. A habitus, dorsal view; B habitus, ventral view; C habitus, lateral view; D prosoma, dorsal view; E prosoma, ventral view; F prosoma, anterior view; G epigastric region, ventral view H endogyne, ventral view; I endogyne, dorsal view. Abbreviation: bss = bell-shaped structure. Scale bars: A-F = 0.4 mm; G-I = 0.1 mm.