Archerd Shell Collection > Shell Classes > Gastropoda > [Neritidae]


Family: Neritidae (Nerites)


Description

 
Most genera in the Neritidae are amphibious. Nerita species are high-tide shore dwellers. They live either on rocks or mangrove trees. About 50 species are known, largely found in the tropics. In the superfamily, Neritoidea, most are operculate, except  Helicina. In the Helicinidae fanily, the operculum is shell-like, with a short projection.  Theodoxus, is found mainly in or near freshwater streams, as are Clypeola, and Septaria. The latter two closely resemble slipper limpets and have only a rudimentary operculum. The Neritopsidae, another  freshwater family, lives in or near streams like Theodoxus, above. In the freshwater neritidae, unlike most freshwater snails where young are born live or hatch directly from eggs, development involves a planktonic larval form referred to as a veliger (Tom Eichhorst).
 
The superfamily, Neritoidea, is remarkable in that it represents a transition line between Vetigastropoda and the more specialized Sorbeconcha clades. Several families show specific and quite evolutionarily advanced features; e.g., reproduction by internal fertilization, with penis and oviduct equivalents, and, air-breathing features. Species in the Helicinidae and Hydrocenidae families, for example, possess a lung chamber and vascular plexus for absorbing oxygen directly from air (see Pulmonate Snails), along with renal specializations for living on land. Neritodryas while technically amphibious is also adapted to terrestrial living.
 
Several species among the Neritidae are also notable in that heritable phenoplastic responses to the environment have been demonstrated as a factor in speciation. Such phenoplastic switching may also underlie the numerous colormorphs of this species (T. Eichorst, personal communication).
 
 

Classification
Class: Gastropoda
Clade: Cycloneritimorpha
Superfamily: Neritoidea
Family: Neritidae
 
Major Genera
  • Genus: Clypeola
  • Genus: Nerita
  • Genus: Neritilia
  • Genus: Neritina
  • Genus: Neritodryas
  • Genus: Puperita
  • Genus: Septaria
  • Genus: Smaragdia
  • Genus: Theodoxus
  • Genus: Vittina


Nerita polita subspecies antiquata (Récluz, 1841)
Ancient Nerite
Northern Australia


Vittina coromandeliana (Sowerby I. 1836)
Coromandel-Wood Nerite

 

LINK --SEE OTHER NERITES:

Freshwater Neritidae
(various shells)

 


Archerd Shell Collection > Shell Classes > Gastropods > Nerites