Ischnothyreus longyang 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 longyang Tong & Zhang sp. nov.

Materials

Type status: Holotype. Occurrence: recordNumber: SYNU-721; recordedBy: Zongxu Li, Luyu Wang ; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 57B4E8C2-B0A4-5835-8ED2-92C6C567A3F6; Taxon : scientificName: Ischnothyreus longyang; order: Araneae ; family: Oonopidae ; genus: Ischnothyreus ; Location : country: China; stateProvince: Yunnan; county: Baoshan City ; locality: Longyang District , Lujiang Town , Nankang bealock, ; Identification : identifiedBy: Yanfeng Tong ; Event : samplingProtocol: sifting leaf litter; eventDate: 28/02/2011

Description

Male (holotype). Body: habitus as in Fig. 4 A-C; body length 1.91. Carapace: 0.91 long, 0.73 wide; yellow, oval in dorsal view, with brown egg-shaped patches behind eyes, pars cephalica strongly elevated in lateral view, sur-face of elevated portion of pars cephalica smooth, sides finely reticulate, lateral margin straight, smooth (Fig. 4 C and D). Clypeus: straight in frontal view, ALE separated from edge of carapace less than their diameter (Fig. 4 F). Eyes: ALE largest, ALE circular, PME circular, PLE oval; posterior eye row straight from above; ALE touching, ALE-PLE touching. Sternum: longer than wide, pale orange (Fig. 4 E). Mouthparts: chelicerae, endites and labium yellow; chelicerae straight, base of fangs with flag-like process, fang groove with a few small and two larger denticles (Fig. 5 K and L); an-teromedian tip of endites with one strong, tooth-like projection (Fig. 4 E). Abdomen: 1.00 long, 0.61 wide; dorsal scutum well sclerotised, dark brown, covering 1/2 of the abdomen width and approximately 1/2 of the abdomen length, not fused to epigastric scutum; epigastric and postepigastric scutum well sclerotised, yellow, fused; postepigastric scutum covering about 2/3 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, with a retrolateral broad lobe (Fig. 5 A-I).

Female. Unknown.

Diagnosis

The new species is similar to Ischnothyreus qiuxing Tong & Li, 2021 in the size of the abdominal scuta, but can be distinguished by the flag-shaped sclerotised process of cheliceral fang (Fig. 5 K) vs. finger-shaped process ( Tong et al. 2021: figs. 13H-J, 21F and G) and the broad retrolateral lobe of palpal bulb (Fig. 5 H) vs. lack the lobe, but has a tuber-like projection ( Tong et al. 2021: fig. 14H).

Etymology

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

Distribution

Known only from the type locality.

Figures

Figure 4. Ischnothyreus longyang 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 5. Ischnothyreus longyang 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 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 distal part of left chelicera, anterior view; L distal part of left chelicera, posterior view. Abbreviation: fp = flag-shaped process; rl = retrolateral lobe. Scale bars: A-F, J-L = 0.1 mm; G-I = 0.05 mm.