Oia probosciella Tanasevitch 2022, new species
Creators: name: Tanasevitch, Andrei V.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Oia
Oia probosciella

description: Oia probosciella, new species   
(Figs. 1–5, 6–11)  
 Type material. Holotype, male: northern VIETNAM, Vinh Phuc Province, Vinh Yen District, Tam Dao, 900 m a.s.l., 27 April 2000, coll. A. V. Abramov (ZMMU); 2 females, paratypes, collected together with the holotype (ZMMU).   
 Etymology. The species epithet is a Latin noun referring to the proboscis-like shape of the outgrowth on the palpal tibia in the male.   
 Diagnosis. The new species can be assigned to Oia, as being very similar to other congeners, according to the same chaetotaxy (2.2.1.1) and trichobothriotaxy (I–III), by the same modification of the carapace in both sexes, by some genitalia characters, i.e., the modified palpal tibia carrying a long and thick seta, the same simple structure of the embolic division in the male, as well as by the conformation of the epigyne, which has the epigynal plate. The new species is diagnosed by the proboscis-like shape of the palpal tibia, by the peculiar structure of the embolic division in the male, as well as by the trapeziform epigynal plate in the female. Oia probosciella, new species, particularly closely resembles the Eastern Chinese O. breviprocessia Song & Li, 2010, and the Himalayan Oia kathmandu Tanasevitch, 2019. The male of O. probosciella is easily distinguished from any congener by the proboscis-like shape of the palpal tibia, and by the absence of a lateral apophysis on the palpal tibia. Besides that, the new species has no apical spear-shaped process on the distal suprategular apophysis as observed in O. kathmandu and, unlike O. breviprocessia, it has two welldefined radical apophyses in the embolic division. The female of O. probosciella, new species, differs from O. kathmandu and O. breviprocessia by the trapeziform epigynal plate.   
 Description. Male holotype. Total length 1.15. Carapace 0.55 long, 0.45 wide, prominent behind a very compact ocular area, as in Figs. 1–3; pale brown to brown, with a narrow grey margin. Sulci absent. Chelicerae 0.25 long, a mastidion absent. Legs pale brown. Leg I 1.49 long (0.45 + 0.18 + 0.35 + 0.26 + 0.25), IV 1.44 long (0.45 + 0.15 + 0.33 + 0.28 + 0.23). Chaetotaxy 2.2.1.1, spines 0.5–1 times as long as diameter of corresponding leg segment. Metatarsi I–III each with a trichobothrium. TmI 0.31. Palp very small (Figs. 6–10): Patella elongated, broadened distally. Tibia with a long, slightly curved outgrowth on prolateral side, ending with two small denticles, and a thick seta dorsally. Paracymbium very small, hook-shaped. Distal suprategular apophysis weakly sclerotised, conical distally. Embolic division: radix large and broad, distally with two sclerotised folds resembling slender radical apophyses; embolus short, a slender tube. Abdomen 0.63 long, 0.48 wide, dark grey (Figs. 1, 2).   
Female paratype. Total length 1.28. Carapace less prominent behind ocular area than in male (Fig. 4); pale brown, 0.55 long, 0.48 wide. Chelicerae 0.28 long, a mastidion absent. Legs pale brown. Leg I 1.39 long (0.38 + 0.18 + 0.33 + 0.25 + 00.25), IV 1.34 long (0.43 + 0.15 + 0.30 + 0.23 + 0.23). Chaetotaxy 2.2.1.1, spines 0.5–1 times as long as diameter of corresponding leg segment. Metatarsi I–III each with a trichobothrium. TmI 0.44. Abdomen 0.80 long, 0.60 wide, grey (Figs. 4, 5). Epigyne (Figs. 5, 11): Epigynal plate trapeziform, twice as high as base. Receptacles subspherical or bean-shaped.  
 Distribution. Known only from the type locality in northern Vietnam.
description: Published as part of Tanasevitch, Andrei V., 2022, Two new species and six new records of linyphiid spiders from Vietnam (Araneae: Linyphiidae), pp. 305-311 in Raffles Bulletin of Zoology 70 on pages 306-307, DOI: 10.26107/RBZ-2022-0014, http://zenodo.org/record/7174861