Parartemiopsis shangrilaensis sp. nov.

Figs 1A -D, 2A -F, 3A -L, 4, 5A -O

Parartemiopsis = Parartemiopsis sp. Shu et al. 2013.

Type materials.

Holotype: one male in alcohol, KIZ-CR-2011010. Allotype: one female in alcohol, KIZ-CR-2011011.

Type locality.

China: Yunnan Province: Shangri-La County: Patatson National Park: 27°52′2″N, 99°58′58″E, 3670 m a.s.l., a small, shallow temporal pond in Militang meadow; 20 August 2011; Shu S-S, Jiang W-S, and Zhao Y-P leg. Militang meadow is in an alpine valley surrounded by mountains covered in coniferous forest. A small river winds through the valley, which receives runoff from the surrounding slopes. The meadow has a mosaic of wetlands and uplands. This species is so far only known from the type locality.

Additional materials examined.

Same data as types: one male, six females; 20 August 2011. Same location data as types: 10 males, 48 females; 16 August 2019; Jiang W-S, leg.

Similar species.

Parartemiopsis longicornis (Smirnov, 1930).

Diagnosis.

Typical for genus. Male antennal appendage lamellar, subtriangular, apically subacute (Fig. 3E). Second antenna proximal antennomere lacking lateral hemispherical bulge. Second antenna distal antennomere medial surface with subproximal rounded protrusion covered in spinulae (Fig. 3H). Genital segment medial lamellar projection with medial longitudinal lines of spinulae elevated on crests (Fig. 3K).

Description.

Average length (head anterior margin to telson posterior margin): 7.4 mm (range 6.2-8.7 mm) in males; 7.9 mm (range 6.2-10.2 mm) in females.

Holotype male. Body red or jacinth in life (Fig. 1C). Head typical for genus. Eye plus peduncle length subequal to first antenna length. Eye large, width>0.2 × second antennal proximal antennomere medial width. First antenna long, filiform, extending to second antennae distal antennomere midlength, apex with five or six aesthetascs.

Antennal appendage lamellar, directed anteromedially, apex broadly triangular (Figs 2A, 3E). Appendage basal portion inerm, distal portion bearing conical spinulae arranged in two or three marginal rows. Anterior surface with scattered, large, anteriodistally directed spines. Each anterior surface spine conical, 2-3 × lateral spinulae.

Second antenna extending to thoracopod IV or V (Fig. 1C). Second antenna proximal antennomere (Fig. 3A) subcylindrical, length nearly 1.5 × breadth. Posteriolateral surface with medial patch bearing ~10 setae (Fig. 3B). Lateral surface with rings composed of four or five micropapillae surrounding a single filiform seta (Fig. 3C). Anteromedial surface with denticulae and sparse setae (Fig. 3E). Anterior surface with five or six rows of setae, with groups of scattered micropapillae arranged as on lateral surface (Fig. 3F).

Distal antennomere laterally compressed, length ~1.5 × proximal antennomere. Distal antennomere narrowing to medial bend ~70° at proximal third of antennomere length (Figs 2A, 3A, G). Just proximad to bend, medial surface with hemispherical protuberance covered in fine denticulae (Fig. 3A, H). Distal two-thirds parallel-sided with remainder straight to apex which is medially bent ~35° (Fig. 3A). Anterior margin with triangular projection midway between bend and apex. Apex subacute (Fig. 3A, I).

Thoracic segments dorsally smooth (Fig. 1C). Thoracopod I with praeepipodite divided, proximal portion oval, distal portion elongate-oval, both with margins inerm and smooth. Epipodite lamellar, length ~2 × width, apex angular. Exopod elongate oval, length <epipodite, proximolateral margin with five spines, remaining margins with plumose setae. Endopod broadly oval, margined with plumose setae. Endite VI broadly rounded, with long plumose marginal setae in two groups, bearing one and two middle submarginal spines, respectively. Endite V semicircular, proximal margin with two spiniform setae, remaining margins with plumose setae. Endites VI and III each with long plumose submarginal setae and three spiniform marginal setae. Endite I + II breadth greater than endites II-VI combined, bearing long plumose submarginal setae and one stout, spiniform marginal seta. Thoracopods II-XI serially homologous (Figs 2B, 4) with respect to thoracopod I, endites III-V margined with two or three spines.

Genital thoracic segments fused, ventrally expanded. Genital segment I (Fig. 3J) smooth, elongate, with paired longitudinal ventromedial ridges, their combined width approximately half segment width. Genital segment I distal margin with bead.

Gonopod rigid basal portion (Figs 2C, D, 3K) with ventromedial longitudinal lamellar process, projecting posteriorly, with medial and lateral margins inerm, submedially with longitudinal arcuate carina margined with dense, fine denticulae, extending onto oblique distal margin (Fig. 3K, L). Gonopod small, lateral to lamellar process, subcylindrical, posteriorly directed; eversible portion unobserved.

Telson and cercopods as typical for genus. Cercopods margined with plumose setae.

Allotype female. Body reddish brown in life (Fig. 1D). Head smooth (Figs 2E, 5A), first antenna length subequal to second antenna, apex with five or six aesthetascs (Fig. 5B). Second antenna (Figs 2E, 5C) subcylindrical, with scattered, filiform setae, apex tapering to point (Fig. 5D, E). Thoracopods as in male. Thoracic segments X and XI with dorsolateral conical projections, apex spiniform (Figs 2F, 5G-I, L). Genital thoracic segments fused (Fig. 5L). Genital thoracic segments with single dorsolateral sensory seta surrounded by four or five ridges (Fig. 5I-K). Brood pouch extending to abdominal segment II (Fig. 5G), width subequal to thorax (Fig. 5L). Telson and cercopods as in male.

Egg. Subspherical (Fig. 5N), diameter ~250 μm, with dense ridges ~50 μm wide, rounded in cross section. Ridges lacking spines, rarely closing to form polygons. Ridges separated by deep grooves ≤10 μm wide. Ridges rough, with dense, regularly distributed pores (Fig. 5O).

Etymology.

The specific epithet " shangrilaensis " refers to the species being from Shangri-La County. The gender is feminine.