(Fig. 21B)
Heptacarpus fuscimaculatus Wicksten, 1986: 47, figs. 1, 2; 1988a: 243; 1990b: 595. — Chace 1997: 44.
Diagnosis. Rostrum short, slightly exceeding first segment of antennular peduncle, with 3–6 dorsal, 0–1 ventral spines. All segments of antennular peduncle with 1 spine each, stylocerite reaching end of first segment. Third maxilliped, pereopods 1–3 with epipods. Merus of first pereopod with spine. Pereopods 3–5 with spinose, bifid dactyls. Merus of pereopod 3 with 2 or 3 spines; pereopod 4, with 1–2 spines; pereopod 5, with 0–1 spine. Pleura of abdominal somites 1–3 rounded, 4, 5 with posterolateral points. Abdominal somite 5 with tooth on ventral midline. Telson with 3–5 pairs dorsolateral spines. Female total length 12 mm, male not reported.
Color in life. Translucent with lines of brown chromatophores to pale green (Wicksten 1986).
Habitat and depth. On floating docks, in kelp holdfasts, sand, gravel, algae, 0–295 m, usually at 50 m or less.
Range. Santa Rosa I., California to off Thurloe Head, Baja California. Type locality Big Fisherman's Cove, Santa Catalina I., California.