isomerista

Isomerista is a genus of small, marine snails belonging to the family Rissoidae. These gastropod mollusks are found in the intertidal and shallow subtidal zones of temperate and tropical waters worldwide. The shells of Isomerista are typically small, ovate, and thin-walled, often exhibiting a smooth or finely sculptured surface. The aperture is generally large and somewhat effuse. Coloration can vary but often includes shades of white, cream, or pale brown, sometimes with subtle banding. Isomerista species are detritivores or grazers, feeding on algae and organic debris found on rocks and other substrates. They are a common component of the epifauna in many coastal environments. The taxonomy of Isomerista has been subject to revision, with some previously assigned species now placed in other genera. Distinguishing between species within Isomerista often relies on detailed examination of shell morphology and anatomical features, making them of interest to malacologists. Their small size and cryptic habitats can make them challenging to find and study.