Juvenile Kaloplocamus acutus
Kaloplocamus acutus Baba, 1949
Looking somewhat like a worn out scrubbing brush this appearance of Kaloplocamus acutus begs the question, does it want processes on its notum or not? The effect would seem to be a bit half-hearted with a few stumpy translucent white stalks sprouting at their ends a number of slender red papillae that look like regrowth from a recent pruning.
An uncommon and unpredictably encountered species of Triophidae nudibranch K. acutus is usually found under rocks or coral slabs subtidally. The bright orange, sometimes yellow, body has white specks scattered all over. There is a remnant of the mantle edge present as a slight ridge running between the afore-described 3 or 4 processes situated laterally along each side of the notum. The oral veil bears a further 6 of these processes jutting directly outwards. The rhinophores are comparatively large and the non-retractable gills small. The foot is broad and the tail pointed. Typically observed at 30 mm to 40 mm in length although there are records of up to 78 mm.
The recorded distribution of K. acutus has spread over the past few years and now encompasses from Japan south to New South Wales, Australia and sites in between, and westward from New Caledonia through Indonesia to the Andaman Islands.
Diet is presumed to be bryozoans.
Marshall & Willan 1999. Nudibranchs of Heron Island, Great Barrier Reef, Backhuys Publishers.
Cobb& Willan 2006. Undersea Jewels, ABRS, Canberra.
Rudman 2001 - 2008. Kaloplocamus acutus , Factsheet & Related Messages, Sea Slug Forum, Australian Museum, Sydney.
Gary Cobb and Dave Mullins
on location in Queensland, Australia
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