Crassispira maura

Crassispira maura
	Apertural view of a shell of Crassispira maura
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Caenogastropoda
Clade:	Hypsogastropoda
Clade:	Neogastropoda
Superfamily:	Conoidea
Family:	Pseudomelatomidae
Genus:	Crassispira
Species:	C. maura
Binomial name
	Crassispira maura; (Sowerby I, 1834)
Synonyms[1]
	Crassispira inaequistriata Li, 1930; Crassispira nigricans Dall, 1919; Crassispira perla Smith, 1947; Knefastia nigricans (Dall, W.H., 1919); Pleurotoma maura Sowerby I, 1834 (original combination); Turricula (Knefastia) nigricans Dall W.H., 1919;

Crassispira maura, common name the dark-coloured pleurotoma, is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.[1]

Pleurotoma maura Kiener L.C., 1840 is a synonym of Pilsbryspira aterrima (Sowerby, G.B. I, 1834)

Description

The length of the shell varies between 45 mm and 85 mm.

The turreted shell is acuminated and blackish brown. The whorls are tuberculated in the middle, dotted round the lower part, whilst the upper part exhibits a depression from the rilling up of the sinus. The siphonal canal is recurved.[2]

The slender, acute shell is blackish brown with the anterior part of the body whorl pale reddish brown. It has a conspicuous periostracum and a closely appressed suture separated by a single cord from the constricted anal fascicle. It contains nine whorls, without the (lost) protoconch. The axial sculpture consists of (on the body whorl eight) prominent angular ribs with wider interspaces, beginning abruptly at the shoulder rapidly dwindling anteriorly and obsolete on the base. These ribs are crossed by (on the body whorl about 14) widely spaced slender cords, slightly nodulous at the intersections. The aperture is narrow. The anal sulcus is shallow. The outer lip is sharp, simple and with a slight subsutural callus. The inner lip is erased. The columella is straight. The siphonal canal is wide and very slightly recurved.[3]

Distribution

This marine species occurs from Mazatlan, Mexico to Ecuador

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References

Crassispira maura (Sowerby I, 1834). Retrieved through: World Register of Marine Species on 4 April 2010.
Conchologia iconica, or, Illustrations of the shells of molluscous animals; Reeve, Lovell, Brooks, Vincent, Reeve, Frederic, Sowerby, G. B.I (George Brettingham), Taylor, John Edward, Reeve Benham & Reeve, Savill, Edwards and Co., Spottiswoode & Co. Vincent Brooks, Day & Son, ; vol.1 (1843) This article incorporates text from this source, which is in the public domain.
Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) This article incorporates text from this source, which is in the public domain. (described as Turricula (Knefastia) nigricans)

G.B. Sowberby I. Proc. Geol. Soc., 1833, p. 137
Reeve, Conch. Syst., vol. ii. pi. 133. f. 4.

External links

Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295.
"Crassispira maura". Gastropods.com. Retrieved 16 January 2019.

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[WoRMS-1] Crassispira maura (Sowerby I, 1834). Retrieved through: World Register of Marine Species on 4 April 2010.

[2] Conchologia iconica, or, Illustrations of the shells of molluscous animals; Reeve, Lovell, Brooks, Vincent, Reeve, Frederic, Sowerby, G. B.I (George Brettingham), Taylor, John Edward, Reeve Benham & Reeve, Savill, Edwards and Co., Spottiswoode & Co. Vincent Brooks, Day & Son, ; vol.1 (1843) This article incorporates text from this source, which is in the public domain.

[3] Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) This article incorporates text from this source, which is in the public domain. (described as Turricula (Knefastia) nigricans)