Cylindrobulloidea

Cylindrobulloidea Thiele, 1931 is a taxonomic suborder of small shelled sea slugs, marine opisthobranch gastropod mollusks in the order Cephalaspidea, the headshield slugs.

The suborder Cylindrobulloidea used to be recognized as monogeneric suborder; in other words there was only one family in the suborder, the family Cylindrobullidae and one e genus "Cylindrobulla".

It was treated by Jensen (1996) [cite journal | author=Jensen, K.R.| title=Phylogenetic Systematics and classification of the sacoglossa (Mollusca, Gastropoda, Opisthobranchia)| journal=Philosophical Transcactions of the Royal Society| year=1996| volume=351| pages=91–122| doi=10.1098/rstb.1996.0006] as a sister group of Sacoglossa. However, a recent systematic review by Paula Mikkelsen (1998) [Mikkelsen, P.M. 1998. Cylindrobulla and Ascobulla in the western Atlantic (Gastropoda, Opisthobranchia, Sacoglossa): systematic review, description of a new species, and phylogenetic reanalysis. Zoologica Scripta, 27(1): 49-71.] has argued that the genus "Cylindrobulla" actually belongs in Cephalaspidea, where it forms a monophyletic group Oxynoacea with the shelled sacoglossans. This change in taxonomy was suggested on the basis of the similarity in many characteristics: digestive, sexual, pallial (= concerning the mantle), and the nervous system.

Finally, in the new taxonomy of Bouchet & Rocroi (2005), it has been classed in a separate Group Cylindrobullida.

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