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Onchidium verruculatum
(Cuvier, 1830)
 
Onchidium verruculatum
Maximum size:  about 35 mm.

Identification:  This is a grayish-black slug-like animal with a dorsal surface covered by variably sized tubercles. They resemble land slugs in that their eyes are on the tips of stalks.

Natural history:  Onchidium verruculatum is a common species in the high intertidal on rocky shorelines and on overhanging kiawi branches. It probably does most of its feeding at night while exposed during low tides and appears to graze on microalgae. (Note 1)

Distribution:  Maui, Oahu and Kauai.

Taxonomic notes:  It's listed as Peronia sp. in Edmondson, 1946 and referred to as the "warty slug" in Hoover, 1998 & 2006.

Photo:  CP: about 35 mm: Hekili Point, Maui; Nov. 19, 2007.

Observations and comments:

Note 1:  Although Kay (1979) states that it feeds on the red algae Ahnfeltia, we haven't been able to confirm the observation.
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