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apex

 

defensive fluid




 
Volvatella vigourouxi
(Montrouzier, 1861)
 
Volvatella vigourouxi
Maximum size:  6.5 mm shell length (Terry Gosliner, pers. com.).

Identification:  This species has a thin, largely transparent shell that narrows into a spout posteriorly and has a medial constriction that varies in prominence. The animal is light orange, flecked with darker orange and grayish white (the latter in spiral bands below the apex).

Natural history:  The few known specimens of Volvatella vigourouxi have been found in shallow water on Caulerpa sp. Like Volvatella ventricosa, it releases a milky fluid when disturbed, presumably for defensive purposes. (Note 1)

Distribution:  Oahu: widely distributed in the Indo-Pacific.

Taxonomic notes:  This may be the animal listed in Kay, 1979 and Kay & Schoenberg-Dole, 1991 as Volvatella pyriformis. Details of color and form appear to be a good match for the original description of that species. If so, it was first reported from Hawaii in Pease, 1868.

Photo:  Terry Gosliner: narcotized: Oahu.

Observations and comments:

Note 1:  Thomas Irvine stated that his animal "was initially found burrowing into some algae in a tidepool, but when I pulled it out it began spewing white stuff (ink? viscera?) before crawling away and burrowing back into some algae."
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