Rhynocrangon alata (Rathbun, 1902)

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 121

Rhynocrangon alata (Rathbun, 1902)

( Fig. 29H, I)

Sclerocrangon alata Rathbun, 1902a: 891 . — Rathbun 1904: 134, fig. 72, 73.— Kozloff 1974: 164. — Wicksten 1980: 38. Rhynocrangon alata . — Zarenkov 1965: 1764. — Butler 1980: 93. — Jensen 1995: 42, fig. 63.

Diagnosis. Body stout, shell thick, knobby. Rostrum short, about 0.5 times carapace length, with broad base, curved concavely from base to apex. Carapace with 2 dorsal teeth arising from median carina, antennal, branchiostegal, weak pterygostomian teeth, hepatic tooth on each side. Eye small, exposed. Antennular peduncle not as long as scaphocerite. Lateral tooth of scaphocerite slightly exceeding blade. Third maxilliped long, stout, with exopod. Pereopod 1 with sharp distal tooth on carpus, dactylus of subchela closing transversely across propodus. Pereopod 2 slender, chelate. Pereopod 3 slender, dactylus slender, acute. Pereopods 4, 5 stout, dactyls slender, acute. Abdominal somites 1, 2 with large median dorsal tubercles, somite 3 with high median carina with posterior projection, somites 4, 5 each with median dorsal carina, projected posteriorly as blunt tooth; pleura rounded or obtuse. Telson shorter than uropods, with 2 pairs minute dorsolateral spines, acute apex. Male total length 44 mm, female 45.

Color in life. Variable, mottled with brown, rose-pink patches ( Jensen 1995).

Habitat and depth. On hard rocks or shale 11–167 m,.

Range. Peter the Great Bay , Russia; Akutan I., Bering Sea to Santa Barbara Channel, (34˚ 25' N, 120˚18' W), California. Type locality Admiralty Inlet, Puget Sound .