Planes marinus Rathbun, 1915

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 264

Planes marinus Rathbun, 1915

( Fig. 60G, H)

Planes marinus Rathbun, 1915: 120 , pl. 3; 1917: 258, pl. 64. — Chace 1966: 646. — Hart 1982: 218, fig. 90.

Pachygrapsus marinus . — Chace 1951: 65. — Edmondson 1959: 169, fig. 8b. — Hart 1963: 127.

Diagnosis. Carapace somewhat broader than long, lateral margins nearly straight, converging posteriorly, one blunt tooth behind postorbital tooth; front more or less straight; surface of carapace marked by grooves. Chelipeds heavy, merus marked by short lines, anterodistal border expanded, dentate; carpus with blunt tooth at inner angle, palm swollen, fingers curved, with teeth. Pereopods 2–5 short, flat, merus broad, anterior border of propodus with dense setae, dactyl short, bearing spines, setae. Male carapace length 9 mm, female carapace length to 15 mm.

Color in life. Variable, carapace bright red-brown with dark striations, chocolate brown or light gray, cheliped gray with pink on merus, carpus; pereopods 2–5 banded with light, dark gray or shades of brown ( Hart 1982).

Habitat and depth. On floating objects, usually away from shore.

Range. British Columbia to Baja California, off Oahu, Hawaiian Is.; New Zealand, off St. Helena I. in southern Atlantic. Type locality west of "Lower California.”

Remarks. There are fewer reports of this species than of Planes major in California and Oregon. It has been taken at sea off British Columbia and been cast ashore in Oregon. Planes major and P. marinus may co-occur on the same drifting log.