Species of Nerita can be found worldwide in tropical waters in the middle and upper intertidal zones. They are gregarious herbivores.
Description
The thick shell is broadly ovate or globular and low-spired. It has a smooth surface. The shells are spirally ribbed or show some axial sculpturing. The ventral side has a large columellar callus or parietal wall. The callus shows small pustules. The aperture and the edge of the columella are usually dentate with fine or robust teeth. The calcareus operculum is thick and can be smooth or with a granular structure. The whorls are covered with strong spiral cords.
Taxonomy
Several subgenera have been proposed over the course of time, but various authors in the past could not agree on the placement of many species. The subgeneric placement of the species of Nerita was revised by Vermeij in 1984.[2] However, inconsistencies still remain over the use and validity of many taxonomic names,[3] because species show a wide variety of colors, patterns and even details of shell morphology, which has given rise to many synonyms.
^Chen, G.; Ye, Y.; Lu, C.; Li, R.; Weng, J.; Xu, Y. (2006). "Distribution of Littoraia melanostoma Gray (Littorinidae) and Nerita lineata Gmelin (Neritadae) in rehabilitated mangroves". Ying Yong Sheng Tai Xue Bao=the Journal of Applied Ecology / Zhongguo Sheng Tai Xue Xue Hui, Zhongguo Ke Xue Yuan Shenyang Ying Yong Sheng Tai Yan Jiu Suo Zhu Ban (in Chinese). 17 (9): 1721–1725. PMID17147188.
Récluz, C. 1841. Description de quelques nouvelles espèces de Nérites vivantes (2e partie, suite et fin). Revue Zoologique 4: 333-343
Reeve, L. 1855. Monograph of the genus Nerita. Conchologia Iconica 9: pls. 1-19
Frey, M. A.; Vermeij, G. J. (2008). "Molecular phylogenies and historical biogeography of a circumtropical group of gastropods (Genus: Nerita): Implications for regional diversity patterns in the marine tropics". Molecular Phylogenetics and Evolution. 48 (3): 1067–1086. doi:10.1016/j.ympev.2008.05.009. PMID18586528.
Tan K. S. & Lee S. S. C. (April 2009) "Neritid egg capsules: are they all that different?" Steenstrupia30(2): 115–125. Copenhagen, Denmark. ISSN 0375-2909. PDF
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