''Amphiplica concentrica'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

, a marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Pseudococculinidae Pseudococculinidae is a family (biology), family of small sea snails or false limpets, marine (ocean), marine gastropod mollusks in the superfamily Lepetelloidea (according to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), taxonomy of t ...

Description

The length of the shell attains 9.5 mm, its diameter 7 mm and its heigth 2.75 mm. The microsculpture of the protoconch consists of prismatic crystals. They have one or several gill leaflets on the left side of the soft body. (Original description in German) The shell is white and egg-shaped, appearing rather low, with the

apex The apex is the highest point of something. The word may also refer to: Arts and media Fictional entities * Apex (comics) A-Bomb Abomination Absorbing Man Abraxas Abyss Abyss is the name of two characters appearing in Ameri ...

being situated somewhat behind the middle, inclined backwards and hookedly curved inwards. Towards the front, it slopes gradually and somewhat convexly, while towards the back, it slopes steeply and distinctly concavely. The entire nucleus is smooth and somewhat sunken. The slope of the remaining shell appears weakly convex towards the front and sides, and straight towards the back. The

sculpture Sculpture is the branch of the visual arts that operates in three dimensions. Sculpture is the three-dimensional art work which is physically presented in the dimensions of height, width and depth. It is one of the plastic arts. Durable sc ...

consists of equally spaced, regular concentric folds that suddenly decrease after the middle; in between these folds, one notices very fine radially running threads with a good magnifying glass. The margin is sharp, and the inside is smooth with a weak muscle scar. Thiele J., 1909: ''Cocculinoidea und die Gattungen Phenacolepas und Titiscania Martini & Chemnitz'', Systematisches Conchylien-Cabinet. 2nd ed. 11A (539): 1–48

Distribution

This species occurs in the Atlantic Ocean, north off the

Azores The Azores ( , , ; , ), officially the Autonomous Region of the Azores (), is one of the two autonomous regions of Portugal (along with Madeira). It is an archipelago composed of nine volcanic islands in the Macaronesia region of the North Atl ...

References

External links

* {{DEFAULTSORT:Amphiplica Concentrica concentrica Gastropods described in 1909