Pyrgospira obeliscus

Pyrgospira obeliscus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Caenogastropoda
Clade:	Hypsogastropoda
Clade:	Neogastropoda
Superfamily:	Conoidea
Family:	Pseudomelatomidae
Genus:	Pyrgospira
Species:	P. obeliscus
Binomial name
	Pyrgospira obeliscus; (Reeve, 1845)
Synonyms[1]
	Clathrodrillia aenone Dall, W.H., 1919; Clathrodrillia nautica Pilsbry, H.A. & H.N. Lowe, 1932; Drillia aenone (Dall, W.H., 1919); Crassispira tomliniana Melvill, J.C., 1927; Pleurotoma obeliscus Reeve, 1845; Pyrgospira aenone (Dall, 1919); Pyrgospira nautica Pilsbry & Lowe, 1932; Pyrgospira tomliniana Melvill, 1927;

Pyrgospira obeliscus is a species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.[1]

Description

The size of the shell varies between 18 mm and 40 mm.

The yellowish brown shell contains about seven whorls exclusive of the (lost) protoconch. The spire is acute. The whorls are markedly shouldered. The suture is strongly appressed with a strong cord in front of it. The anal fasciole is excavated, arcuately striated, with a few obscure fine spiral threads running in it. The axial sculpture consists of (on the body whorl fifteen) short prominent nearly vertical subrectangular ribs rounded above and confined to the peripheral region in front of which on the base of the body whorl are about twice as many thread-like ridges mostly continuous over the base to the beginning of the siphonal canal. The incremental lines are rather marked. The spiral sculpture consists of three or four threads with wider interspaces overrunning and sometimes slightly nodulating the peripheral ribs. In front of these on the base are about eight spiral threads conspicuously nodulous at the intersections with the minor ridges, and with much wider interspaces. On the younger shells these threads are more close set, fewer and less nodulous, the minor ridges inconspicuous. Finally between these in the adult are more or less distinct finer spiral striae. The siphonal canal is also spirally threaded with a conspicuous siphonal fasciole. The aperture is rather narrow with a well marked anal sulcus close to the suture, and on the body a prominent subsutural callus. The outer lip is produced, sharp-edged and smooth within. The inner lip is callous. The outer edge of the enamel is slightly raised, and on the siphonal canal prominent with a chink between it and the siphonal fasciole. The siphonal canal is short and recurved. [2]

Distribution

This species occurs in the Pacific Ocean from Nicaragua to Panama; also off the Galápagos Islands.

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References

Pyrgospira obeliscus (Reeve, 1845). Retrieved through: World Register of Marine Species on 31 March 2010.
Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) (described as Clathrodrillia aenone)

External links

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

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[WoRMS-1] Pyrgospira obeliscus (Reeve, 1845). Retrieved through: World Register of Marine Species on 31 March 2010.

[2] Dall (1919) Descriptions of new species of Mollusca from the North Pacific Ocean; Proceedings of the U.S. National Museum, vol. 56 (1920) (described as Clathrodrillia aenone)