Enigmatheres canfieldi ( Rathbun, 1917 )

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 246

Enigmatheres canfieldi ( Rathbun, 1917)

( Fig. 56H–K)

Fabia canfieldi Rathbun, 1917: 106 , text fig. 57, pl. 24, figs. 5, 7. — Schmitt 1921: 254, pl. 39, figs. 5, 6. — Schmitt et al. 1973: 22.

Enigmatheres canfieldi . — Campos-Gonzalez 2002: 31, fig. 1.

Diagnosis. Female: Carapace broad, soft. Front without setae, with short, longitudinal median depression. Second segment of palp of third maxilliped small, shorter, narrower than first segment, terminal segment attached at middle. Palm of chela increasing in width to distal end, fingers long, inclined downward, lower margin of propodus sinuous, fingers not gaping, setose on upper surface, prehensile tooth at middle of dactyl, smaller one at base of fixed finger. Pereopods 2–5 slender, subcylindrical. Pereopod 2 stouter than others, propodi slightly curved, dactyls short, slender. Length of pereopod 3 on right side about 0.3 times longer than length of pereopod 3 on left. Dactyls with hooked apices except on right pereopod 3, with dactyl long, straight. Carapace length about 5 mm. Male has not been described.

Color in life. Not reported.

Habitat and depth. In mantle cavity of keyhole limpet, Megathura crenulata (G.B. Sowerby, 1825) . Depth not reported but probably low intertidal or subtidal zone, where the limpet lives.

Range. Known only from type locality, Monterey , California .

Remarks. Except for the peculiarly elongated legs and their asymmetry, this crab closely resembles the polymorphic crab Fabia subquadrata Dana, 1851 . That species usually associates with pelecypods. More study is needed to determine whether or not this is truly a distinct species.