Eulimella rudis is a species of minute sea snail, a marine gastropod mollusc belonging to the family Pyramidellidae, within the class Gastropoda.
Taxonomy
- Kingdom: Animalia
- Phylum: Mollusca
- Class: Gastropoda
- Subclass: Heterobranchia
- Order: Pyramidelloidea
- Family: Pyramidellidae Gray, 1840
- Genus: Eulimella Gray, 1847
- Species: Eulimella rudis (Monterosato, 1872)
Description Eulimella rudis exhibits the typical characteristics of its genus, featuring a small, slender, and turreted (tower-shaped) shell. The shell is generally whitish, glossy, and smooth, though faint growth lines may be present. It typically reaches only a few millimeters in length. A distinguishing feature, common to many heterobranch gastropods, is its heterostrophic protoconch, meaning the initial larval shell coils in the opposite direction to the subsequent adult shell (teleoconch). The aperture (opening) of the shell is simple and ovate.
Distribution This species is known to inhabit the Mediterranean Sea. Its specific distribution within the Mediterranean may vary, but it is typically found in habitats where its host organisms are present.
Ecology and Biology Like other members of the family Pyramidellidae, Eulimella rudis is an ectoparasitic gastropod. These snails feed by extending a specialized proboscis into the tissues of their invertebrate hosts, often polychaete worms or bivalve molluscs, and sucking out bodily fluids. While the specific host species for E. rudis are not always precisely documented, it is presumed to follow this parasitic feeding strategy. They are typically found in shallow to moderate depths, often associated with sandy, muddy, or detrital substrates where their hosts live.
Nomenclature The species Eulimella rudis was first scientifically described by the Italian malacologist Tommaso di Maria, Marchese di Monterosato, in 1872.