Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Family Next species _______________   Additional Photos   underside   rhinophores    young, about 20 mm   shell	Umbraculum sp. #1   Maximum size:  65 mm. Identification:  This is a large species with a broad, cap-shaped external shell covering the center of the notum. The mantle has small, relatively simple tubercles and its color is uniform bright yellow. Shells of large animals are usually overgrown with algae and remnants of a hairy periostracum may be present around their margins. They are less heavily calcified than the shells of Umbracuum umbraculum. Natural history:  Umbraculum sp. #1 is a rare nocturnal species. The four live animals recorded were all found in tide pools at moderately exposed sites. It probably feeds on sponges and lays a large, frilly white egg mass similar to that of Umbraculum umbraculum. Distribution:  Maui and Molokai: widely distributed in the Indo-Pacific. Taxonomic notes:  Although lumped with Umbraculum umbraculum by most authors, it seems likely that this form is a distinct species based on its smaller, simpler tubercles; less heavily calcified shell and uniform yellow color. All three characters appear to be consistently associated with each other in photos from throughout the Indo-Pacific. Based on shell calcification and tubercles, it's probably more closely related to the Umbraculum population found in the Eastern Pacific (also probably distinct) than to the Indo-Pacific Umbraculum umbraculum (or the Atlantic sp.). Photo:  CP: 65 mm: tide pool; Napili Bay, Maui; Dec. 12, 2004. Observations and comments: Note 1:  ( )
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