Headshield slugs | |
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A live individual of Chelidonura varians in the family Aglajidae, head end towards the lower left | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Cohort: | Tectipleura |
Order: | Cephalaspidea |
Superfamilies | |
See text |
The order Cephalaspidea, also known as the headshield slugs and bubble snails, is a major taxon of sea slugs and bubble snails, marine gastropod mollusks within the larger clade Euopisthobranchia.[1] Bubble shells is another common name for these families of marine gastropods, some of which have thin bubble-like shells.[2] This clade contains more than 600 species.[3]
Members of this worldwide clade used to be considered the most ancestral of the opisthobranchs, but now they are considered as derived and specialized members of the Euthyneura Spengel, 1881.[4]
Headshield slugs are the most morphologically diverse group of all the opisthobranchs.[citation needed]
Oskars
was invoked but never defined (see the help page).