| Abstrak/Abstract |
Neritidae is one of Gastropoda family called the Nerites. The shell is thick and the shape
is mostly in hemisphere with calcareous D shape of operculum. Some genuses have
polymorphism variation then it made a problem to recognize the species. The primarily
identification used the shell characters such as columellar deck and its sculpture, included the
number of teeth on aperture. The shell features still confused in some reasons. This study
purposed another way to identify Nerites member based on the shell and operculum
morphometric. It is very rare to using operculum as a useful identification feature. We
investigated3033 individual Nerites of 19 species from intertidal zone of 7 beaches and 2
mangroves of Alas Purwo National Park and estuarine-fresh water Nerites from South-region of
Banyuwangi District. We have been introducing the terms of the shell, operculum features and
the morphometric formula. The operculum features are very specific in inner and outer side: peglike
projection, apophysis, striae, apophysis striae, longitudinal groove, the granulae-small
bumps, and lines or ridges. The operculum coloration is similar in some species but very specific
to the other. We found the age lines on the striae, but in some Nerites, we can not see it because
the age was not more than one year.
Keywords: Neritidae is one of Gastropoda family called the Nerites. The shell is thick and the shape
is mostly in hemisphere with calcareous D shape of operculum. Some genuses have
polymorphism variation then it made a problem to recognize the species. The primarily
identification used the shell characters such as columellar deck and its sculpture, included the
number of teeth on aperture. The shell features still confused in some reasons. This study
purposed another way to identify Nerites member based on the shell and operculum
morphometric. It is very rare to using operculum as a useful identification feature. We
investigated3033 individual Nerites of 19 species from intertidal zone of 7 beaches and 2
mangroves of Alas Purwo National Park and estuarine-fresh water Nerites from South-region of
Banyuwangi District. We have been introducing the terms of the shell, operculum features and
the morphometric formula. The operculum features are very specific in inner and outer side: peglike
projection, apophysis, striae, apophysis striae, longitudinal groove, the granulae-small
bumps, and lines or ridges. The operculum coloration is similar in some species but very specific
to the other. We found the age lines on the striae, but in some Nerites, we can not see it because
the age was not more than one year.
Keywords: morphometric, neritidae, operculum, shell, terminology
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