Eoista

Eoista is a genus of sea snails, marine gastropod mollusks in the family Buccinidae, the true whelks. The genus is native to the Indo-Pacific region. Species within Eoista are typically characterized by their relatively small to medium size, with shells that are often ovate and somewhat elongated. The surface of the shell may exhibit axial ribs and spiral sculpture, varying in prominence depending on the species. The aperture is usually narrow, and the siphonal canal is short.

The distribution of Eoista species is widespread across the tropical and subtropical waters of the Indian and Pacific Oceans. They are commonly found in shallow to moderately deep marine environments, often inhabiting sandy or muddy substrates, and sometimes associating with coral reefs. Their diet generally consists of small invertebrates or scavenging on dead organic matter. Reproduction is typically oviparous, with eggs laid in capsules.

Scientific classification places Eoista within the order Neogastropoda, a large and diverse group of predatory or scavenging sea snails. The Buccinidae family is known for its variety of forms, and Eoista represents a distinct lineage within this group. Research into the genetics and morphology of Eoista species continues to refine our understanding of their evolutionary relationships and ecological roles within their marine habitats. Examples of species include Eoista minor and Eoista subdecussata.