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Order of gastropods From Wikipedia, the free encyclopedia
Cycloneritida (nerites and false-limpets) is an order of land snails, freshwater snails, and sea snails.[1]
| Cycloneritida | |
|---|---|
| |
| Family Neritidae: Nerita plicata on intertidal rock surfaces at Turtle Island, Fiji | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Neritimorpha |
| Order: | Cycloneritida |
| Superfamilies | |
|
See text | |
| Synonyms | |
|
Cycloneritimorpha | |
These are gastropod molluscs within the subclass Neritimorpha. 14 of the families in the order are extant, and eight of the families are extinct.
It was previously categorized as the clade Cycloneritimorpha.[2]
According to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), as well as the Cycloneritida, the subclass 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 Cycloneritida 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 the taxonomy of the Gastropoda (Bouchet & Rocroi, 2005).
The spelling of Cycloneritimorpha has been amended to the order Cycloneritida in the new taxonomy of the Gastropoda by Bouchet and Rocroi in 2017 [5]
Clade Cycloneritimorpha contains:
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