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The notaspids are primitive opisthobranchs that have a typical molluscan ctenidium rather than a pseudobranch (a "false" secondarily derived respiratory structure). The Pleurobranchidae lack an external shell, or are devoid of a shell altogether.
Some notaspid opisthobranchs have lost their shells (e.g., the preceding species), and others (family Umbraculidae), such as this one, have retained their limpet-shaped shells.
Find Notaspidea information at
To cite this page: 1999. "Notaspidea" (On-line), Animal Diversity Web. Accessed February 13, 2012 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Notaspidea.html
Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.
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