Arquatopotamon jizushanense, Chu, Kelin, Zhou, Lijun & Sun, Hongying, 2017

Chu, Kelin, Zhou, Lijun & Sun, Hongying, 2017, A new genus and new species of freshwater crab (Decapoda: Brachyura: Potamidae Ortmann, 1896) from Yunnan Province, China, Zootaxa 4286 (2), pp. 241-253 : 245-250

publication ID	https://doi.org/ 10.11646/zootaxa.4286.2.7
publication LSID	lsid:zoobank.org:pub:850B6F02-CB2A-421B-A84E-1ACB9FB9D322
DOI	https://doi.org/10.5281/zenodo.6015845
persistent identifier	https://treatment.plazi.org/id/800FC436-FFDF-3F48-FF09-69C0ED8AFDB2
treatment provided by	Plazi
scientific name	Arquatopotamon jizushanense
status	sp. nov.

Treatment

Arquatopotamon jizushanense View in CoL sp. n.

( FigS. 1–6 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 )

Material examined. Holotype: male (adult), 19.4 × 16.4 mm, NNU 160506, Shiqian Village (25°56’15’’ N, 100°24’19’’ E, 1778 m aSl), JizuShan Town , Binchuan County, Dali City in Yunnan ProVince, coll. Kelin Chu, Pengfei Wang & Hongying Sun GoogleMaps , 2 May 2016. ParatypeS: female (adult), 22.3 × 18.5 mm, NNU 160510, Same data aS holotype (allotype) ; 2 maleS (adult), 20.1 × 16.6 mm, NNU 160507; 18.3 × 15.5 mm, NNU 0 90808, Same data aS holotype .

Diagnosis. AS for genuS.

Description. Carapace about 1.2 timeS broader than long, Subquadrate, flat, dorSal Surface gently conVeX longitudinally, punctate, glabrouS; regionS diStinctly defined; epibranchial region rugoSe, meSogaStric region Slightly conVeX ( Fig. 1 View FIGURE 1 A). CerVical grooVe Shallow, H-Shaped grooVe between gaStric and cardiac regionS diStinct ( Fig. 1 View FIGURE 1 A). PoStfrontal lobe Slightly conVeX, poStorbital creSt indiStinct, poStorbital region Slight concaVe ( Fig. 1 View FIGURE 1 A, B). Frontal region defleXed downwardS, anterior border emarginated medially ( Fig. 1 View FIGURE 1 B). DorSal orbital margin ridged, eXternal orbital angle triangular, outer margin lined with 4 Small granuleS ( Fig. 1 View FIGURE 1 B). Anterolateral margin criState, epibranchial tooth pointed, diStinct, clearly demarcated from eXternal orbital tooth ( Fig. 1 View FIGURE 1 A).

Third maXilliped meruS about 1.1 timeS aS broad aS long, trapezoidal, with median depreSSion, tip of the meruS triangular Shaped; iSchium about 1.4 timeS aS long aS broad, rectangular, with diStinct median SulcuS; eXopod reaching proXimal 1/4 of meruS length, without flagellum ( Fig. 1 View FIGURE 1 B, 2B).

ChelipedS Slightly unequal; meruS trigonal in croSS-Section; marginS crenulated, carpuS with Sharp Spine on inner diStal angle, with Spinule at baSe ( Fig. 1 View FIGURE 1 A, C, 2A). Outer SurfaceS of manuS of major chela Smooth, about 1.5 timeS aS long aS high, Slightly longer than moVable finger, gape narrow when fingerS cloSed, cutting edge lined with rounded, blunt teeth, diStal part of cutting edge Sharp and without teeth ( Fig. 1 View FIGURE 1 C, 2A). Ambulatory legS Slender, SurfaceS Smooth; dactyluS Slender, with denSe Spinule, Second ambulatory leg meruS about 1.5 timeS aS long aS dactyluS; laSt leg with propoduS about 1.4 timeS aS long aS broad, Slightly Shorter than dactyluS ( Fig. 1 View FIGURE 1 A).

Male abdomen broadly triangular, third Somite wideSt; SiXth Somite width 2.2 timeS length, telSon broadly triangular, with about 1.6 timeS aS broad aS long ( Fig. 1 View FIGURE 1 C, 3B). Male thoracic Sternum Smooth; median grooVe of male thoracic Sternum deep; interruption between SutureS of SterniteS 4/5, 5/6, 6/7 broad; median longitudinal Suture between SterniteS 7 and 8 moderately long ( Fig. 3 View FIGURE 3 A). G1 long, diStal part of Subterminal, terminal Segment arch Shaped (meSioVentral View; Fig. 2 View FIGURE 2 E), tip of terminal Segment reaching Suture between thoracic SterniteS 4/ 5 in situ ( Fig. 3 View FIGURE 3 A); Subterminal Segment about 1.9 timeS aS long aS terminal Segment; terminal Segment tongue-Shaped, diStinctly curVed Ventrally (Ventral View) ( Fig. 2 View FIGURE 2 D, E, F and G). G2 Slightly longer than G1, baSal Segment about 2.6 timeS aS long aS diStal Segment ( Fig. 2 View FIGURE 2 C).

Female abdomen longitudinally elongated, oVate; SiXth Somite about 3.3 timeS aS broad aS long, telSon Semicircular, about 2.4 timeS aS broad aS long ( Fig. 3 View FIGURE 3 D). Female gonopore on thoracic SterniteS 5/6, reaching Suture between thoracic SterniteS 4/ 5 in situ, deep, without operculum, poSterior margin with V-Shaped notch, anterior portion with protuberance ( Fig. 3 View FIGURE 3 C, D). The poSteromedial of female gonopore with domed protuberance on thoracic Sternite 6 ( Fig. 3 View FIGURE 3 C, D).

Distribution and habitat. Arquatopotamon jizushanense gen. n., sp. n. waS found under StoneS in Small hill StreamS in Shiqian Village (25°56’15’’ N, 100°24’19’’ E), JizuShan Town, Binchuan County, Dali City in Yunnan ProVince, China ( Fig. 5 View FIGURE 5 A, B); at an altitude of 1778 m. No other potamidS were obSerVed at the type locality.

Live coloration. Carapace iS uSually dark brown, whereaS chelipedS and ambulatory legS are reddiSh brown to purple in life ( Fig. 5 View FIGURE 5 B).

Etymology. Arquatopotamon jizushanense gen. n., sp. n. iS named after the type locality, JizuShan Town in Yunnan ProVince, China.