Betaeus harfordi (Kingsley, 1878)

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 64

Betaeus harfordi (Kingsley, 1878)

( Fig. 16A–D, Pl. 4A)

Alpheus harfordi Kingsley, 1878a: 198 .

Betaeus harfordi . — Rathbun 1904: 108. — Schmitt 1921: 79, fig. 55. — Johnson & Snook 1927: 310, fig. 261. — Hart 1964: 447, figs. 46–47, 54, 58–61, 73–74. — MacGinitie & MacGinitie 1968: 279. — Ache & Davenport 1972: 94.— Word & Charwat 1976: 51. — Chace & Abbott 1980: 571, fig. 23.3. — Wicksten 1984a: 188. — Campos-Gonzalez 1988: 384. — Kuris et al. 2007: 637, PL. 317 D.

Diagnosis. Front of carapace shallowly emarginate, produced over eye. Stylocerite reaching to distal quarter of second segment of antennular peduncle. Scaphocerite narrow, lateral tooth exceeding blade, separated from blade by slit, reaching third segment of antennular peduncle. Anterior margin of carapace shallowly curved. Chela of pereopod 1 flattened laterally, palm, fingers subequal in length; fingers meeting evenly or gaping. Carpus of pereopod 2 with 5 articles, article 1 longest. Pereopod 3 stout, flattened laterally, with spine on merus, stout, bifid dactyl. Pereopod 4 similar but shorter than 3, pereopod 5 shorter than 4. Abdominal pleura 1–4 rounded, pleuron 5 acute. Telson with 2 pairs dorsal spines, posterolateral spines vestigial or missing, posterior margin curved. Total length 24 mm

Color in life. Dark purple, blue-black, deep blue ( Hart 1964).

Habitat and depth. In mantle cavity of abalone ( Haliotis spp. ), rarely wavy top, Astraea undosa (Woods, 1828) ; lower intertidal zone to 22 m.

Range. Fort Bragg , California to Magdalena Bay, Baja California, Mexico. Type locality Santa Catalina I. , California .