Jianghuaimon dabiense, Zhao & Xu & Huang, 2022

Zhao, Jun-Da, Xu, Yi-Yang & Huang, Chao, 2022, Jianghuaimon dabiense gen. nov. et sp. nov (Crustacea: Decapoda: Potamidae), a new genus and new species of freshwater crab from eastern-central China, Zootaxa 5168 (4), pp. 431-440 : 433-438

publication ID	https://doi.org/ 10.11646/zootaxa.5168.4.3
publication LSID	lsid:zoobank.org:pub:922E28B2-ED85-4BA0-B0FF-A010940DCCF1
DOI	https://doi.org/10.5281/zenodo.6899748
persistent identifier	https://treatment.plazi.org/id/03AB5B2E-FFBD-6B04-F48C-FC423D6E1CB2
treatment provided by	Plazi
scientific name	Jianghuaimon dabiense
status	gen. nov. et sp. nov

Treatment

Jianghuaimon dabiense View in CoL gen. nov. et sp. nov

[Chinese name: kDzü淮ēø]

( Figs. 1–5 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 )

Type material. Holotype: SYSBM002003 , male (20.4 × 15.7 mm), Yaoluoping National Nature Reserve (31.17°N, 116.22°E), Huoshan County, Lu’an City , Anhui Province, China, in burrow in mountain seepage, 500–550 m a.s.l., coll. Jun-Da. Zhao, October 2020. GoogleMaps

Paratypes: SYSBM002005–002006 , 2 males (15.1 × 11.8 mm, 15.2 × 12.1 mm) same data as holotype GoogleMaps . SYSBM002007 , 1 female (16.4 × 13.0 mm) same data as holotype GoogleMaps . SYSBM002004 , 1 male (17.4 × 13.4 mm) same data as holotype GoogleMaps . SYSBM002008–002009 , 1 male (17.5 × 13.2 mm), 1 female (14.8× 11.4 mm), Dabie Mountains National Nature Reserve (30.97°N, 116.04°E), Yingshan County, Huanggang City , Hubei Province, China, under rocks in forest floor near mountain stream, 980–1100 m a.s.l., coll. Jun-Da. Zhao, October 2020. NCU GoogleMaps MCP4322 View Materials , 1 male (21.9 × 16.7 mm) same data as holotype GoogleMaps . NCU MCP 4323 View Materials 1 female (14.9 × 11.9 mm) same data as SYSBM GoogleMaps 002008–002009. NNU 20105JD1–20105JD2, 2 males (16.9 × 12.9 mm, 17.3 × 13.3 mm), Foziling Town (31.33°N, 116.23°E), Huoshan County, Lu’an city, Anhui Province, China, under rocks on forest floor near mountain stream, 200–350 m a.s.l., coll. Jun-Da. Zhao, October 2020 GoogleMaps .

Description. Carapace broader than long; subquadrate; width 1.3 × length (n = 15); regions clearly demarcated. Dorsal surfaces strongly pitted ( Fig.1 View FIGURE 1 ). Frontal margin ridged in dorsal view ( Fig.1 View FIGURE 1 ). Epigastric cristae rugose, blunt, divided by conspicuous groove ( Fig.1 View FIGURE 1 , 2A View FIGURE 2 ). Postorbital cristae rugose, slightly raised ( Figs. 1 View FIGURE 1 , 2A View FIGURE 2 ). Cervical groove relatively large and deep; H-groove visible ( Fig.1 View FIGURE 1 ). External orbital margin bluntly triangular with nearly no gap with anterolateral margins ( Figs. 1 View FIGURE 1 , 2A View FIGURE 2 ). External orbital tooth small, inconspicuous (Figs. 1,2A). Epibranchial tooth low, blunt (Figs.1,2A). Anterolateral margin ridged, margins slightly trending upwards, with 12–15 granules (Figs.1,2A). Posterolateral margin straight, slightly rugose ( Fig.1 View FIGURE 1 ). Epibranchial region with small, smooth bumps ( Fig.1 View FIGURE 1 ). Orbits medium-sized; supraorbital margin smooth, slightly ridged; infraorbital margins slightly ridged, lined with numerous inconspicuous granules (Figs. 1,2A). Sub-orbital, sub-hepatic and upper parts of pterygostomial regions surface relatively rugose; divided with sutures that are lined with numerous inconspicuous granules ( Fig. 2A View FIGURE 2 ). Central epistome covered with thick setae ( Fig. 2A View FIGURE 2 ). Epistomial median lobe narrowly triangular ( Fig. 2A View FIGURE 2 ).

Maxilliped III merus width about 1.3 × length; ischium width about 0.8 × length; merus pitted, subtrapezoidal with median depression; ischium trapezoidal, inner-upper margin rounded; with distinct median sulcus; exopod reaching to approximal one–eighth of merus height, with long flagellum length nearly same height with merus ( Fig. 3A View FIGURE 3 ).

Chelipeds slightly unequal, surface rugose, finely pitted ( Figs. 1 View FIGURE 1 , 3F–G View FIGURE 3 ). Merus cross section triagonal, margins weakly crenulated, surfaces generally smooth ( Figs. 1 View FIGURE 1 , 2A View FIGURE 2 ). Carpus inner distal angle with sharp spine and blunt spinule at base, surface rugose ( Figs. 1 View FIGURE 1 , 2A View FIGURE 2 ). Male major cheliped palm length about 1.4–1.5 × height (n=3), 1.4 × in females (n=2); dactylus 0.8 × palm length in both sex: males (n=3), females (n=2) ( Fig. 3F–G View FIGURE 3 ). Palm surface slightly rugose, finely pitted. Inner margin of fingers lined with round, blunt, small to large sized teeth; with small gap when fingers closed ( Fig. 3F–G View FIGURE 3 ). Pereiopods II–V (first to fourth ambulatory legs) slender ( Fig. 1 View FIGURE 1 ). Pereiopods III the longest; pereiopods V propodus length 1.9–2 × width in males (n = 3) and females (n = 2); dactylus stout, with short, sharp spines on margins ( Fig. 1 View FIGURE 1 ).Male thoracic sternum glabrous, pitted; sternites I–IV wide, width 1.8 × length. Sternites I, II fused, forming a wide triangular shape; sternites II, III fused, separated by a horizontal grove; sternites III, IV fused, with indistinct sulcus ( Fig. 2B View FIGURE 2 ). Male sternopleonal cavity deep, long, reaching to imaginary line joining medial part of cheliped coxae ( Fig. 2B–D View FIGURE 2 ); median longitudinal suture between sternites VII and VIII relatively short, shallow, not reaching sternite VI ( Fig. 2D View FIGURE 2 ). Female vulva ovate, large-sized, opened inwards, oblique to the horizontal axis of pleon, with outer rim; located within sternite suture VI, almost reaching suture V/VI and VI/VII ( Fig. 2F View FIGURE 2 ).

Pleon and telson broadly triangular in males ( Fig. 2C View FIGURE 2 ), broadly ovate in females ( Fig. 2E View FIGURE 2 ). Male pleonites III–VI gradually narrower upward; pleonite VI 2.5 × as broad as long; telson 1.5 × as broad as long, with semicircular apex ( Fig. 2C View FIGURE 2 ).

G1 generally slender, pointed anterolaterally, long, reaching beyond pleonal locking tubercle while exceeding sternites IV/V suture in situ ( Fig. 2D View FIGURE 2 ). Subterminal segment 2.0 × as long as terminal segment (n=3), inner margin concave, outer margin convex. Terminal segment large and stout with wide opening at truncate tip, inner margin strongly convex, outer margin strongly concave ( Fig. 3C–E, H–I View FIGURE 3 ). G2 basal segment subtrapezoid, about 1.5–1.8 × length of flagelliform distal segment (n=4) ( Fig. 3B View FIGURE 3 ).

Etymology. The species is named after its type locality, the Dabie Mountains.

Distribution. Yaoluoping National Nature Reserve, Foziling Town, Huoshan County, Lu’an City, Anhui Province, China; Dabie Mountains National Nature Reserve, Ying Shan County, Huang Gang City, Hubei Province, China.

Color in life. Generally dark brown to umber. Carapace margins, ambulatory legs and chelipeds with orange and black spots. Propodus of ambulatory legs with wide orange stripe ( Fig. 5D View FIGURE 5 ). Third maxilliped merus with distinctive goldish oval shaped spot, reaching over to upper ischium in some individuals. Abdomen ivory.

Habitat. Jianghuaimon dabiense gen. nov. et sp. nov. is usually found in burrows or under rocks in mountain seepages and streams ( Fig. 5C View FIGURE 5 ). The species shows some terrestrial adaptability as evident from them also being found under stones or in dried burrows on land that are relativity distant from the water body (10–20 m). This suggests some plasticity in its habitat choice ( Fig. 5B View FIGURE 5 ). The species was found within the altitude of 200–1100 m a.s.l. Longpotamon depressum (Dai & Fan, 1979) , were observed to be syntopic with Jianghuaimon dabiense gen. nov. et sp. nov. in some aquatic habitats.