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Philinopsis pilsbryi
(Eliot, 1900)
 
Philinopsis pilsbryi
Maximum size:  about 76 mm (Hoover, 2006).

Identification:  This is a cream animal broadly reticulated in black. In contrast to Philinopsis sp. #1, the black lines don't extend onto the foot.

Natural history:  Philinopsis pilsbryi is rarely seen on Maui where it has been found only in Halimeda kanaloana beds at depths of  9-15 m (30-49 ft). However, it is locally common on Oahu at depths of 1-3 m (3-10 ft) in Kaneohe Bay and other highly protected sites. It has also been found at Hale'iwa trench to 24 m (80 ft) and Scott Johnson  reports it from more exposed sites.

Distribution:  Big Island, Maui, Oahu and French Frigate Shoals: widely distributed in the Indo-Pacific.

Taxonomic notes:  It is referred to as "Pilsbry's headshield slug" in Hoover, 1998 & 2006 although the photo is of Philinopsis sp. #1 in the 1998 edition. It was first reported from Hawaii in Pease, 1860 (as Philinopsis nigra). Pilsbry, 1921 and Edmondson, 1946 list it as both Aglaja nigra and Aglaja pilsbryi. Aglaja pilsbryi hawaiensis Pilsbry, 1921 is a synonym. (Kay, 1979)

Photo:  CP: 27 mm: 2006 CREEF expedition French Frigate Shoals; Oct. 24, 2006.

Observations and comments:

Note 1:  ( )
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