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Unidentified Pleurobranchid
#3
 
Unidentified Pleurobranchid #3
Maximum size:  about 28 mm.

Identification:  This is a pale-peach animal that may appear white in ambient light. It has a weakly pustulate notum and may be distinguished from Berthella pellucida by its lack of translucent-white reticulation. It has prominent acid glands in its notum.

Natural history:  Unidentified pleurobranchid #3 is known from two animals found in caves at 6-8 m (20-25 ft).

Distribution:  Big Island.

Taxonomic notes:  Perhaps, this is a third Berthellina sp.? (Note 1) Alternatively, there's a chance that it might turn out to be a very pale Berthelina delicata. It was first recorded in Hawaii at "Kei Kei Caverns," Kohala Coast, Big Island by David Rafalovich on Aug. 1, 2013.

Photo:  Marketa Murray: about 20 mm: Kohala, Big Island; Dec. 11, 2020.

Observations and comments:

Note 1:  The pleurobranchid shells listed as "un. sp. #2" could turn out to be from this species. However, with multiple candidates, that will require further work for confirmation.
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