Home Acknowledgments Conventions Glossary Maps References Links Articles Thumbnails Species list Order Next family	Umbraculidae The family Umbraculidae has usually been considered monotypic with a single circumtropical species, Umbraculum umbraculum. However, it appears likely that it contains a small number of distinct, but similar-appearing, species that may be distinguished based on tubercles, shell calcification and color. Two species are probably present in Hawaii, both in the genus Umbraculum. Umbraculum umbraculum Umbraculum sp. #1
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