''Ividia aepynota'' is a species of

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

, a

marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusk in the family Pyramidellidae, the pyrams and their allies.

Description

The pupiform shell is translucent. Its length measures 1 mm. The

whorls A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral d ...

of the

protoconch A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called ...

are small, obliquely immersed in the first post-nuclear turns, marked by four spiral cords. The summits of the five whorls of the teleoconch are appressed. They are marked by two strong, spiral keels between the sutures, a third at the periphery, and a fourth on the middle of the base, the last two somewhat less strong than the rest. The posterior keel forms the strong tabulation at the summit of the whorls and is strongly tuberculated, 14 tubercles appearing upon the second and 20 upon the remaining whorls. The space between the keels is marked by rather strong lines of growth. The greatest convexity coincides at the superperipheral keel. The aperture is irregularly ovate and somewhat effuse anteriorly. The posterior angle is obtuse. The thin outer lip is angulated by the keels, showing the external markings within. The columella is strong, curved, without visible fold in the aperture. The shell is reinforced by the base. The parietal wall is covered by a thin callus."A Monograph of West American Pyramidellid Mollusks"

William Healy Dall William Healey Dall (August 21, 1845 – March 27, 1927) was an American naturalist, a prominent malacologist, and one of the earliest scientific explorers of interior Alaska. He described many mollusks of the Pacific Northwest of America, and w ...

and Paul Bartsch, Smithsonian Institution, 1909

Distribution

This species occurs in the Pacific Ocean off California. Odostomia aepynota 001

References

External links

To USNM Invertebrate Zoology Mollusca Collection
{{Taxonbar, from=Q3173560 Pyramidellidae Gastropods described in 1909