Paracortina viriosa (Wang & Zhang, 1993)

Figs 17, 18, 19, 27A, B, 28

Altum viriosum Wang & Zhang, 1993: 381, figs 19-23.

Paracortina viriosa: Stoev and Geoffroy 2004: 103, key; Liu and Tian 2015: 139, key.

Studied material.

1 male, China, W Lijiang, W Yangtze, W Xinhuacun, 0.7 km NW Daqingtou, 26°56'23"N, 99°52'16"E, 2720m, 01.06.2018, I. Belousov & I. Kabak leg. (Rd 5354 ZMUM), Akkari det. 2023, 2 males, China, NW Lijiang, W Chang J. NW Jinzhuang, 2.5 km N Tuozhi Vill, 27°09'32"N, 99°41'47"E, 2315 m, 17.05.2017, I. Belousov & I. Kabak leg. (Rd 5345 ZMUM), Akkari det. 2023.

Diagnosis.

Most similar to P. voluta especially in the distal part of the telopodite with two main folds and a strong hook-shaped median processes, but differs from the latter by the shape of the distal process, in posterior view subquadrate with a shallow notch (vs earlobe-shaped), the shape and position of the anterior lamella (at the basis of the distal part, rounded and serrated on the lower margin vs more distal and smaller).

Descriptive notes.

Male with 68 PTs + telson. Length ca 60.5 mm. Live colour unknown. Preserved specimen with a general tawny dark brown, legs and antennae with a slightly fading colour but showing hints of dark sputter (Fig. 17A), prozona dark brown with paler alveolate spots (Fig. 17C, E); metazona dorsally dark brown, especially on crests, interrupted by larger irregular yellow alveolate spots on the lateral crests; colour gradually fading below the ozopores and ventrally. Head with dark pigmentation on the vertex and frons, mandibular stipes and gnathochilarium with yellowish spots, labral area paler (Fig. 17A, B). Fields of ommatidia subtriangular, composed of ~ 60 ommatidia in eight rows. Organ of Tömösváry large, situated close to and touching, anterior side of eye (Fig. 17A).

Male sexual characters.

Head with a small projection on vertex (Fig. 17B). Leg-pairs 1 and 2 reduced and more setose than the rest, showing prefemoral and tarsal brushes (Fig. 17B), leg-pair 2 with a large dome-shaped anterior process on coxa and posterior gonopore (Fig. 17D), leg-pairs 3 and 4 with anterior triangular projections on coxa (Fig. 17D), leg-pair 6 with a small rounded mesal projection on coxa and a slight constriction of prefemur proximally on the posterior margin (Fig. 27A), leg-pair 7 with strongly modified coxa, anteriorly projecting in a large mesal slightly curved horn (Fig. 27B), trochanter with strong setae.

Gonopods. Parallel, distal solenomeral processes of telopodites crossing (Fig. 18A, B, D, E). Each gonopod with two asymmetrical clavate prefemoroidal processes, with pf1 broader and more setose than pf2 (Figs 18A, B, 19); coxa with a large rounded anterior lobe (Ca) and a smaller lateral one (Cl) (Fig. 19A); long and falcate mesal coxal process (b), reaching the distal part of the telopodite and distally projecting in a pointed tip (broken in the studied specimen). Telopodite (T) with a long and uniformly broad stem, distally abruptly expanding in an apically folded subquadrate plate, with, in posterior view, a slightly oblique and indented lateral margins (Fig. 18A), in anterior view (Fig. 18B) showing a darkly pigmented jagged lamella (dl) projecting antero-laterad (Fig. 18C-E), and a strong hook-shaped curved process pointing distad, gently narrowing towards its apex (Figs 18, 19) and bifurcating into the opening of the solenomere (s) and parasolenomere (ps).

Distribution.

Shangrila and Lijiang County, Yunnan, and Mangkang/Markam? County, Tibet Autonomous Region, China (Fig. 28).

Comments.

The structures on the tip of the falcate mesal coxal process of the gonopod were also illustrated in the original description of P. viriosa by Wang and Zhang (1993) although never mentioned in the description of the species (Wang and Zhang 1993: 382, fig. 21).