''Turbonilla bartolomensis'' 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.Rosenberg, G. (2012). ''Turbonilla bartolomensis'' Bartsch, 1917. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575972 on 2012-03-01Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064

Description

The yellow shell has a conic shape. Its length measures 5.6 mm. The whorls 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 decollated. The nine

whorl 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 ...

s of the teleoconch are appressed at the summit, flattened in the middle, except the last, which is inflated and strongly rounded. The whorls are marked by rather strong, well-rounded axial ribs, which are slightly retractively slanting on the early turns and decidedly so on the later volutions. The intercostal spaces about as wide as the ribs marked by 12 deeply incised spiral pits. Of these the fifth is a mere line, while the first four, the sixth, ninth, and tenth are about twice as wide, and the eighth and ninth and eleventh and twelfth form deep broad pits fully three times the width of the last. The suture is moderately constricted. The periphery of the

body whorl The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk. In gastropods In gastropods, the b ...

is strongly inflated, and well rounded. The base of the shell is short, inflated, and well rounded. It is marked by the continuations of the axial ribs, which extend strongly to the

umbilical Umbilical may refer to: *Umbilical cable *Umbilical cord *Umbilical fold *Umbilical hernia *Umbilical notch *Umbilical vessels **Umbilical artery **Umbilical vein *Umbilical zone *The Umbilical Brothers, two Australian comedic performers, David a ...

area, between which poorly defined spiral striations may be seen. The aperture is short and broadly oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The inner lip is short, partly reflected, free, and provided with an obsolete oblique internal fold at its insertion. The parietal wall is covered by a very thick callus, which renders the peristome complete. P. Bartsch (1917), Descriptions of new west American marine mollusks and notes on previously described forms; Proceedings of the United States National Museum, vol.52
; p.653

Distribution

The type specimen was found in the Pacific Ocean off San Bartolome Bay, Baja California

References

External links

To USNM Invertebrate Zoology Mollusca Collection

To World Register of Marine Species
{{Taxonbar, from=Q3171082 bartolomensis Gastropods described in 1917