ADW: Notaspidea: Information

2009/11/08 04:10:26.647 US/Eastern

Order: Notaspidea

Members of this Order

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.

2009/11/08 04:10:26.891 US/Eastern

To cite this page: 1999. "Notaspidea" (On-line), Animal Diversity Web. Accessed November 09, 2009 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Notaspidea.html.

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Order Notaspidea