Scaeurgus unicirrhus

(delle Chiaje, 1830)

Hatchlings approx. 2.0 mm ML. Body squat, globose, head wide, eyes prominent. Arms short, subequal, 4 primary suckers on each, gradually decreasing in size from 1st to 4th. Outer surface of arms with 3-4 dark chromatophores in one row. Dorsal mantle surface clear, posterior part with patch of about 10, ventral mantle with 35-40 chromatophores on middle and posterior parts, funnel with 2 + 2, dorsal head with 14 (2 + 4 + 4 + 4), ventral head with 2 large, 1 each at arm bases. Iridophores around eyes not visible. Digestive gland with approx. 20 large dorsal visceral chromatophores. Web vestigial. Seven gill lamellae per demibranch in early larva, 11-14 in adults. Egg length 2.2-2.5 mm.

Lower sublittoral and upper bathyal. A characteristic species of oceanic islands and shallow-summit seamounts.

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