| Abstrak/Abstract |
Abstract. Neritidae is one of Gastropoda family called the Nerites. The shell is thick and the shape is mostly in the hemisphere with calcareous D shape of operculum. Some genus has polymorphism variations, causing a problem to recognize the species. The primary identification used the shell characters such as columellar deck and its sculpture, included the number of teeth on aperture. The shell features are still confusing for some reasons. This study proposed another way to identify Nerites member based on the shell and operculum morphometric. It is very rare for using operculum as a useful identification feature. This research investigated 3 033 individual Nerites of 19 species from the intertidal zone of seven beaches and two mangroves of Alas Purwo National Park and estuarine-fresh water Nerites from South-region of Banyuwangi District. In this study, the author introduced the terms of the shell, operculum features and the morphometric formula. The operculum features are very specific on the inner and outer side: peg-like projection, apophysis, striae, apophysis striae, longitudinal groove, the granular-small bumps, and lines or ridges. The operculum coloration is similar in some species but very specific to the other. This research found the age lines on the striae, but in some Nerites, it cannot see because the age was not more than 1 year.
Keywords: morphometric, neritidae, operculum, shell, terminology
|
