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Nerita plicata 2.jpg
Family Neritidae: Nerita plicata on intertidal rock surfaces at Turtle Island, Fiji
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Neritimorpha
(unranked): clade Cycloneritimorpha
Frýda, 1998[1]

See text

Cycloneritimorpha (nerites and false-limpets[2]) is a clade of land snails, freshwater snails, and sea snails. These are gastropod molluscs within the larger clade Neritimorpha. 14 of the families in the clade are extant, and eight of the families are extinct.

According to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), as well as the Cycloneritimorpha, the clade Neritimorpha also contains the (entirely fossil) clade Cyrtoneritimorpha, plus a number of other fossil families that are currently unassigned.

The earliest evolutionary forms of Cycloneritimorpha show double visceral organs, double gills, and normally a double-chambered heart.[3]


The taxonomy of Cycloneritimorpha is based on work by Kano et al. (2002),[4] that recognizes 4 clades. These clades are established on genetic analysis (28S rRNA) of recent species only. These clades proposed by Kano are ranked as superfamilies in taxonomy of the Gastropoda (Bouchet & Rocroi, 2005).

Clade Cycloneritimorpha contains:


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  4. ^ Kano Y., Chiba S. & Kase T. 2002. Major adaptive radiation in neritopsine gastropods estimated from 28S rRNA sequences and fossil records. Proceedings of the Royal Society of London, B, 269: 2457-2465.