Compsodrillia tristicha

Compsodrillia tristicha, common name the saddened turrid, is a species of sea snail, a marine gastropod mollusc in the family Pseudomelatomidae, the turrids and allies.[1]

Compsodrillia tristicha
Shell of Compsodrillia tristicha (specimen at MNHN, Paris)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Pseudomelatomidae
Genus: Compsodrillia
Species:
C. tristicha
Binomial name
Compsodrillia tristicha
(Dall, 1889)
Synonyms[1]

Drillia tristicha Dall, 1889

Description

The length of the shell varies between 10 mm and 25 mm.

(Original description) The white shell is elongated, acute, with a rounded vitreous white two-whorled protoconch and nine succeeding whorls. The spiral sculpture consists of three principal strong threads, enlarged where they pass over the ribs, four more on the base of the body whorl, about eight somewhat weaker ones on the siphonal canal, and a single one in front of and marginating the suture. The interspaces are wide, and upon them and over the fasciole are wound numerous fine, sharp, undulating, secondary spiral threads. All these cross (on the penultimate whorl) fourteen even, rounded, narrow riblets, with narrower interspaces, which start at the anterior edge of the fasciole, cross the whorl, and fail on the siphonal canal. The suture is distinct and wavy. The fasciole is obscure, not excavated. The whorls are rounded. The varix is stout, thick, and rounded. The aperture is narrow. The notch is strongly marked and round. The outer lip is thin, without lirae. The inner lip shows a thin, smooth, elevated callus . The siphonal canal is distinct, rather long and narrow, not recurved. The columella is straight.[2]

Distribution

C. tristicha can be found in the Gulf of Mexico, ranging from the coast of Mississippi south to Brazil.[3]

gollark: You probably want to revert that when the program *exits*.
gollark: > Which is exactly what they wanted here!Not necessarily, this actually does sound like a case where they might want each task to run in its own coroutines (or would, if their pathfinding did yields).
gollark: I mean, it's great for very simple situations where you want to run two things at once in the simplest case, but often projects want to run a listener "thread" and temporarily spawn tasks to handle them or something and this ends up being constantly reinvented.
gollark: > Thanks for that gollark :/.You're welcome! It would be useful if there was an API for this! Perhaps I could simplify some of my stuff and make a PR!
gollark: Parallel isn't great because you can't add an extra task after it starts.

References
  1. Compsodrillia tristicha (Dall, 1889). Retrieved through: World Register of Marine Species on 5 April 2010.
  2. Bulletin of the Museum of Comparative Zoology at Harvard College vol. 18 (1889) This article incorporates text from this source, which is in the public domain.
  3. Tunnell, John W., Jr., Felder, Darryl L., & Earle, Sylvia A., eds. Gulf of Mexico Origin, Waters, and Biota, Volume 1: Biodiversity. Texas A&M University Press, 2009. 669.
  • Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295.
  • Rosenberg, G.; Moretzsohn, F.; García, E. F. (2009). Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in: Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Texas A&M Press, College Station, Texas
  • "Compsodrillia tristicha". Gastropods.com. Retrieved 15 January 2019.
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