| Hydrobia acuta | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Hydrobiidae |
| Genus: | Hydrobia |
| Species: | H. acuta |
| Binomial name | |
| Hydrobia acuta (Draparnaud, 1805) | |
Hydrobia acuta is a species of very small (4-6mm.) brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
Draparnaud's description reads "Coquille ovale-oblongue, un peu conique, aiguë à son sommet,transparente, lisse, quoique marquée de légères stries lorsqu'on l'observe à la loupe. Dans son naturel elle une couleur verdàtre.La spire a six à sept tours. L'ouverture est ovale et le péristome simple.Fente ombilicale peu prononcée. Opercule mince et lisse. In English "Shell oval-oblong, slightly conical, acute at the top transparent, smooth, albeit marked with light streaks when it is observed under the microscope. In nature it is a greenish colour.The spire has six or seven whorls. The opening is oval and the peristome is simple.Little pronounced umbilical slot.Operculum thin and smooth.
This species occurs on the coasts of the Mediterranean Sea and Black Sea and, as a rare species in Ireland.
The gastropod shell is part of the body of a gastropod or snail, a kind of mollusc. The shell is an exoskeleton, which protects from predators, mechanical damage, and dehydration, but also serves for muscle attachment and calcium storage. Some gastropods appear shell-less (slugs) but may have a remnant within the mantle, or in some cases the shell is reduced such that the body cannot be retracted within it (semi-slug). Some snails also possess an operculum that seals the opening of the shell, known as the aperture, which provides further protection. The study of mollusc shells is known as conchology. The biological study of gastropods, and other molluscs in general, is malacology. Shell morphology terms vary by species group.
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