''Carinodrillia winchesterae'' is an extinct

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

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

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 Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is e ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Pseudomelatomidae Pseudomelatomidae is a family of predatory sea snails, marine gastropods included in the superfamily Conoidea (previously Conacea) and part of the Neogastropoda ( Bouchet & Rocroi, 2005). In 1995 Kantor elevated the subfamily Pseudomelatomina ...

, the turrids and allies.

Description

The length of the

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...

attains (the early whorls lost) 26.5 mm, its diameter 8.3 mm; whorls remaining. (Original description) This species is very similar to '' Carinodrillia elocata'', but it is more slender with a longer anterior canal and a deeper posterior sinus. The anal fasciole and the spaces between the spiral ridges are distinctly striate spirally, with in each interval about 6 striae. There are seven broad, rounded axial folds on the penultimate

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 ...

and on 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 ...

, weakening on the anal fasciole. On the face of the body whorl there are 18 narrow, high spiral ridges, a smaller cord above the upper one and a strong, acute cord below the suture. The outer lip is smooth within. The inner lip is a little raised. The

anal sinus The anal sinuses (rectal sinuses) are furrows in the anal canal, that separate the anal columns from one another. The anal sinuses end below in small valve-like folds, termed anal valves The anal valves are small valve-like folds at the lower ends ...

is deep, rounded posteriorly and contracted a little anteriorly.H.A. Pilsbry, 1922, ''Revision of W.MM. Gabb's Tertiary Mollusca of Santo Domingo'', Proceedings of the Academy of Natural Sciences of Philadelphia 73: 318, pl. 16, fig. 7–8
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Distribution

Fossils of this marine species were found in

Tertiary Tertiary ( ) is a widely used but obsolete term for the geologic period from 66 million to 2.6 million years ago. The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start ...

strata of the

Dominican Republic The Dominican Republic ( ; es, República Dominicana, ) is a country located on the island of Hispaniola in the Greater Antilles archipelago of the Caribbean region. It occupies the eastern five-eighths of the island, which it shares wit ...

References

* A. J. W. Hendy, D. P. Buick, K. V. Bulinski, C. A. Ferguson, and A. I. Miller. 2008. Unpublished census data from Atlantic coastal plain and circum-Caribbean Neogene assemblages and taxonomic opinions

External links

Worldwide Mollusc Species Data Base : Carinodrillia winchesterae
* Clech, Pilsbry, Turner, New names introduced by H. A. Pilsbry in the Mollusca and Crustacea; Academy of Natural Sciences of Philadelphia, 1962 {{DEFAULTSORT:Carinodrillia Winchesterae winchesterae Gastropods described in 1922