Pacifastacus nigrescens (Stimpson, 1857)

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 127

publication ID	11755334
DOI	https://doi.org/10.5281/zenodo.5255053
persistent identifier	https://treatment.plazi.org/id/C5657B52-FFE2-B36D-44D1-FF5ECC880869
treatment provided by	Felipe (2021-08-24 08:22:12, last updated by Plazi 2023-11-04 15:45:02)
scientific name	Pacifastacus nigrescens (Stimpson, 1857)
status

Treatment

Pacifastacus nigrescens (Stimpson, 1857) View in CoL

( Fig. 30B, K)

Astacus nigrescens Stimpson, 1857a: 87 View in CoL ; 1857b: 492. — Hagen 1870: 92, pl. III, fig. 168. — Holmes 1900: 166. — Bonnot 1930: 212.

Pacifastacus nigrescens View in CoL . — Riegel 1959: 44 (part, figures probably are of P. fortis View in CoL ). — Hobbs 1976: 23, fig. 13b, 14d. — Kuris et al. 2007: 636.— Larson & Olden 2011: 62.

Diagnosis. Similar to P. leniusculus except rostrum concave, with prominent, acute apex; 5 or 6 lateral teeth, small spinules on postorbital ridges. Major chelae without clusters of setae, chela narrow, palm barely wider than closed fingers, fingers may be gaping. Abdominal pleura sharply triangular. Total length 78 mm.

Color in life. Blackish.

Habitat and depth. Streams near the coast. Depth not reported.

Range. Unalaska, Alaska; Fort Steilacoom , Washington, Alameda Creek , Alameda County and Coyote Creek , Santa Clara County , California ( Holmes 1900). Type locality given as San Francisco, California, but Stimpson said that he purchased his specimens in a market .

Remarks. There have been no reliable records of live P. nigrescens since those of Holmes (1900). Subsequent reports by Bonnot (1930) quoted Holmes or considered P. fortis to be a subspecies of P. nigrescens ( Riegel 1959) . Holmes' specimens probably were burned in the fire following the San Francisco earthquake in 1906, so it is impossible to double-check the identification of his material from Washington and Alaska.

References

Bonnot, P. (1930) Crayfish. California Fish and Game, 16, 212 - 216.

Hagen, H. A. (1870) Monograph of the North American Astacidae. Illustrated Catalogue of the Museum of Comparative Zoology at Harvard College, 3, 1 - 109.

Hobbs, H. H. Jr. (1976) Crayfishes (Astacidae) of North and Middle America. United States Environmental Protection Agency, Water Pollution Control Research Series 18050 ELDO / 72, Cincinnati, Ohio, 173 pp.

Holmes, S. J. (1900) Synopsis of California stalk-eyed Crustacea. Occasional Papers of the California Academy of Sciences, 7, 12 - 62.

Kuris, A. M., Sadeghian, P. & Carlton, J. T. (2007) Keys to Decapod Crustacea. In: Carlton, J. T. (Ed.) The Light and Smith Manual: Intertidal Invertebrates Central California to Oregon. University of California Press, Berkeley, 4 th ed., pp. 636 - 656.

Larson, E. R. & Olden, J. D. (2011) The state of crayfish in the Pacific Northwest. Fisheries, 36, 60 - 73.

Riegel, J. (1959) The systematics and distribution of crayfishes in California. California Fish and Game, 45, 29 - 50.

Stimpson, W. (1857 a) Notices of new species of Crustacea in western North America being an abstract from a paper to be published in the Journal of the Society. Proceedings of the Boston Society of Natural History, 6, 84 - 89.

Stimpson, W. (1857 b) On the Crustacea and Echinodermata of the Pacific shores of North America. Journal of the Boston Society of Natural History, 6, 444 - 532.