Heptacarpus tenuissimus Holmes, 1900

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 89

Heptacarpus tenuissimus Holmes, 1900

( Fig. 20I)

Hippolyte gracilis Stimpson, 1864: 155 [not Hippolyte gracilis Lilljeborg, 1850 , = Eualus gaimardii H. Milne-Edwards, 1837 , Arctic species].

Heptacarpus tenuissimus Holmes, 1900: 203 . — Holthuis 1947: 13, 43; 1969: 3, fig.1.— Kozloff 1974: 167. — Word & Charwat 1976: 131. — Butler 1980: 208. — Wicksten 1990b: 593. — Jensen 1995: 49, fig. 84. — Chace 1997: 45. — Kuris et al. 2007: 651.

Spirontocaris gracilis . — Rathbun 1904: 77, fig. 31. — Schmitt 1921: 59, fig. 37.

Diagnosis. Rostrum exceeding antennular peduncle, with 4 or 5 dorsal, 4–8 ventral teeth, anteriormost dorsal tooth near middle of rostrum. Second, third segments of antennular peduncle with one spine each, stylocerite reaching past first segment. Third maxilliped without epipod. No epipods on pereopods. Pereopods 3–5 slender, with spinose dactyls. Merus of pereopod 3, with 3 or 4 spines; pereopod 4, with 4 spines; pereopod 5, with 2 or 3 spines. Pleura of abdominal somites 1–4 rounded, 5 with strong point. Telson with 4 pairs dorsolateral spines. Male total length 36 mm, female 43 mm.

Color in life. Mostly translucent, with horizontal red line running from scaphocerite to apex of tail fan; appendages marked with red ( Jensen 1995, fig. 84).

Habitat and depth. Mixed sand, shell bottoms, among algae or on mud, 2–137 m ( Jensen 1995). Off San Francisco, California, taken at 54–74 m on fine dark green sand.

Range. Bird I., Alaska to Santa Catalina I. , California. Type locality Puget Sound .