Himalayapotamon

Pati, S. K. & Singh, S., 2017, A new species of freshwater crab of the genus Himalayapotamon Pretzmann, 1966 (Decapoda, Brachyura: Potamidae: Potaminae) from Uttarakhand, northern India, Zootaxa 4237 (1), pp. 191-200 : 198-199

publication ID	https://doi.org/10.11646/zootaxa.4237.1.11
publication LSID	lsid:zoobank.org:pub:3B99DC75-4231-478C-9831-D03E7B0BAE93
DOI	https://doi.org/10.5281/zenodo.6000661
persistent identifier	https://treatment.plazi.org/id/03E12015-3F26-8D44-FF22-4B55F9DBFD70
treatment provided by	Plazi (2017-02-27 11:00:53, last updated 2024-11-29 18:43:25)
scientific name	Himalayapotamon
status

Treatment

Key to the species of Himalayapotamon View in CoL

1. Sixth male abdominal somite short, median length nearly two-fifth greatest width ( Fig. 5C View FIGURE 5 )..........................2

- Sixth male abdominal somite long, median length nearly half greatest width ( Figs. 2 View FIGURE 2 C, 5D)......................... 3

2. G1 terminal joint conical, with tip slightly curved outwards ( Fig. 5 View FIGURE 5 E)............................................................................................. H. bifarium ( Alcock, 1909) View in CoL [ INDIA (Sikkim)? or MYANMAR?]

- G1 terminal joint S-shaped ( Fig. 5 View FIGURE 5 F)............... H. monticola ( Alcock, 1910) View in CoL [ INDIA (Meghalaya and West Bengal)]

3. Male telson with acute apex (see Pretzmann 1966: pl. 3, fig. 11)..................................................................................................... H. kasaulis ( Pretzmann, 1966) View in CoL [ INDIA (Himachal Pradesh)]

- Male telson with rounded apex ( Figs. 2 View FIGURE 2 C, 5D)............................................................. 4

4. Epigastric and postorbital cristae separated by indistinct groove ( Fig. 5B View FIGURE 5 )............................................................................................... H. ambivium ( Alcock, 1909) View in CoL [ INDIA (Himachal Pradesh)]

- Epigastric and postorbital cristae separated by distinct groove ( Fig. 2 View FIGURE 2 A)......................................... 5

5. G1 terminal joint sinuous (see Brandis 2001: fig. 3c).................................................................... H. atkinsonianum (Wood-Mason, 1871) View in CoL [ BHUTAN, INDIA (Meghalaya, Sikkim and West Bengal) and NEPAL]

- G1 terminal joint conical, with almost straight margins ( Fig. 3 View FIGURE 3 A)............................................... 6

6. G1 terminal joint slender (see Brandis 2001: fig. 4c)......................................................... 7

- G1 terminal joint stout ( Fig. 3 View FIGURE 3 A)......................................................................... 9

7. G1 terminal joint blunt towards tip (see Brandis 2001: fig. 4c).................................................... H. emphyseteum ( Alcock, 1909) View in CoL [ INDIA (Himachal Pradesh, Jammu and Kashmir and Uttarakhand), NEPAL and PAKISTAN]

- G1 terminal joint distinctly narrowing towards tip (see Bott 1970: pl. 38, fig. 19).................................. 8

8. G1 terminal joint short, ca. 0.3 times length of subterminal joint (see Bott 1970: pl. 38, fig. 19)............................................. H. koolooense ( Rathbun, 1904) View in CoL [ AFGHANISTAN, INDIA (Himachal Pradesh, Meghalaya, Sikkim, Uttar Pradesh, Uttarakhand and West Bengal) and NEPAL]

- G1 terminal joint long, ca. 0.4 times length of subterminal joint (see Brandis & Sharma 2005: fig. 5C).............................................................................. H. sunkoshiense Brandis & Sharma, 2005 View in CoL [ NEPAL]

9. G1 terminal joint suddenly tapers distally (see Bouvier 1918: fig. 10I).................................................................................................. H. babaulti ( Bouvier, 1918) View in CoL [ INDIA (Himachal Pradesh)]

- G1 terminal joint gradually tapers distally ( Fig. 3 View FIGURE 3 B).........................................................10

10. Postorbital cristae almost straight (see Pretzmann 1963: pl. 1, fig. 1); male telson with straight lateral margins (see Pretzmann 1963: pl. 1, fig. 4); G1 terminal joint long, ca. 0.3 times combined length of subterminal joint and flexible zone (see Pretzmann 1963: pl. 3, fig. 11)........................................ H. marinellii ( Pretzmann, 1963) View in CoL [ INDIA (West Bengal)]

- Postorbital cristae distinctly curved ( Fig. 2 View FIGURE 2 A); male telson with concave lateral margins ( Fig. 2 View FIGURE 2 C); G1 terminal joint short, ca. 0.2 times combined length of subterminal joint and flexible zone ( Fig. 3 View FIGURE 3 A).... H. garhwalense View in CoL n. sp. [ INDIA (Uttarakhand)]

References

Alcock, A. (1909) Diagnoses of new species and varieties of freshwater crabs. Nos. 1 - 3. Records of the Indian Museum, 3 (3), 243 - 252.

Alcock, A. (1910) Catalogue of the Indian decapod Crustacea in the collection of the Indian Museum. Part I. Brachyura. Fasciculus II. The Indian fresh-water crabs- Potamonidae. Indian Museum, Calcutta, 135 pp.

Bott, R. (1970) Die Sußwasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und der Parathelphusoidea (Crustacea, Decapoda). Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft, 526, 1 - 338.

Bouvier, M. E. - L. (1918) Sur quelques Crustaces Decapodes recueillis par M. Guy Babault dans les eaux douces de l'Inde anglaise. Bulletin du Museum National d'Histoire Naturelle, 24, 386 - 393. [Paris]

Brandis, D. (2001) On the taxonomy and biogeography of Potamon atkinsonianum (Wood-Mason, 1871) and Potamon (Potamon) emphysetum (Alcock, 1909). Hydrobiologia, 452 (1 - 3), 89 - 100.

Brandis, D. & Sharma, H. (2005) Taxonomic revision of the freshwater crab fauna of Nepal with description of a new species (Crustacea, Decapoda, Brachyura, Potamoidea and Gecarcinucoidea). Senckenbergiana biologica, 85 (1), 1 - 30.

Pretzmann, G. (1963) Uber einige sud- und ostasiatische Potamoniden (Material des Wiener Naturhistorischen Museums und des Zoologischen Museums der Berliner Humboldt-Universitat). Annalen des Naturhistorischen Museums in Wien, 66, 361 - 372.

Pretzmann, G. (1966) Sußwasserkrabben aus dem westlichen Himalayagebiet. Annalen des Naturhistorischen Museums in Wien, 69, 299 - 303.

Rathbun, M. J. (1904) Les crabes d'eau douce (Potamonidae). Nouvelles Archives du Museum d'Histoire Naturelle, Series 4, 6, 225 - 312.

Figures

FIGURE 2. Himalayapotamon garhwalense n. sp., holotype male (ZSI, WRC-C. 1178). A, dorsal view; B, frontal view; C, ventral view. Scale bar = 10 mm.

FIGURE 3. Himalayapotamon garhwalense n. sp., holotype male (ZSI, WRC-C. 1178). A, dorsal view of right G 1; B, dorsal view of right G 1 terminal joint; C, ventral view of right G 1; D, right G 2. Scale bar = 1 mm.

FIGURE 5. A, C, F, Himalayapotamon monticola (Alcock, 1910), male (21.38 × 17.44 mm) (ZSI, Kolkata-C. 4315 / 2), B, D, Himalayapotamon ambivium (Alcock, 1909), syntype, male (14.88 × 11.68 mm) (ZSI, Kolkata- 5436 / 10), E, Himalayapotamon bifarium (Alcock, 1909), syntype, male (ZSI, Kolkata- 5512 / 10). A, B, dorsal view; C, D, ventral view; E, dorsal view of left G 1; F, dorsal view of right G 1. Scale bar = 1 mm.