Fabia concharum ( Rathbun, 1893 )

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 247

Fabia concharum ( Rathbun, 1893)

( Fig. 56L)

Cryptophrys concharum Rathbun, 1893: 250 (part).— Rathbun 1904: 188, pl. 7.— Weymouth 1910: 60.

Raphonotus lowei Rathbun, 1900 c: 590 ; 1904: 186, text fig. 93.

Fabia lowei Rathbun 1917: 104 , pl. 24, figs. 2, 4, text fig. 55. — Schmitt 1921: 254, pl. 39, figs. 3, 4, text fig. 151. — Johnson & Snook 1927: 391.

Pinnotheres concharum . — Rathbun 1917: 86, pl. 20, figs. 3–6, text fig. 42 (part). — Schmitt 1921: 252, pl. 38, figs. 1–4.

Fabia concharum . — Davidson 1968: 87, fig. 1B, 1C, 1E, 1F (extensive synonymy). — Schmitt et al. 1973: 23. — Garth & Abbott 1980: 613, fig. 25.32.

Diagnosis. Carapace subpentagonal, slightly longer than broad, smooth, rigid, with ridge of coarse setae along anterior, anterolateral margins. Female front sharply deflexed, lacking transverse sulcus across vertical front between orbits. Orbits circular, antennules large, nearly transverse. Palp of third maxilliped very small, merus produced on distomedial margin. Hand of cheliped not widened distally, bearing one row of setae along lower margin. Pereopods 2–4 subequal, pereopod 5 shortest, dactyls about as long as propodi, ending in curved hooks. Male abdomen with terminal segment widening distally, sixth segment hairless with margins subparallel, abdomen considerably wider near proximal end than at distal end. Male carapace length 3.0 mm, female 10.0 mm.

Color in life. Pale brown ( Garth & Abbott 1980: fig. 25.32).

Habitat and depth. Commensal in mantle cavities of pelecypods, intertidal to subtidal. zones. Males may move between hosts.

Range. San Pedro, California to Turtle Bay, Baja California. Type locality San Diego Bay, California .

Remarks. Davidson (1968) explained the confusion between this species and Fabia subquadrata .