Ketaspid

Ketaspid is a genus of marine gastropod mollusks within the family Scissurellidae. These small sea snails are characterized by their distinctively thin, coiled shells, which typically exhibit a slit or hole along the outer edge of the body whorl. This aperture, known as a selenizone, is a defining feature of the Scissurellidae family and is used for respiration and the expulsion of waste. Ketaspid shells are generally translucent and often have intricate sculpture, though this can vary between species.

The distribution of Ketaspid species is widespread, with representatives found in various marine environments across the globe, from shallow coastal waters to deeper oceanic regions. They are typically detritivores or grazers, feeding on algae or organic matter found on the seafloor. Due to their small size and often cryptic habitats, Ketaspid species can be challenging to find and study, leading to a limited understanding of their specific ecological roles and behaviors. Taxonomy within the genus is based on shell morphology, particularly the shape, size, and sculpturing of the shell, as well as the characteristics of the selenizone. Ongoing research continues to refine our understanding of this diverse group of gastropods.