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Taxon profile

species

Agatrix agassizii W. H. Dall, 1889

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Cancellariidae »  genus Agatrix

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Description

Shell small, orange brown, turrited, six-whorled ; nucleus finely irregularly reticulated, polished, nearly smooth, of one and a half whorls; adult with (on the last whorl) about fourteen small even little-elevated ribs, which pass clear over the whorl, and are sharply nodulous on the edge of the shoulder of the whorl, which they cross obliquely to the suture; beside these there are very evident crowded incremental lines which reticulate the finer spirals; spiral sculpture of on the last whorl eight or more primary spirals, with finer and still finer intercalary threads, the primary ones somewhat swollen as they override the ribs. The whorls are strongly shouldered in front of the suture, the shell being covered when fresh with a hispid epidermis; tufts of this stand up from the nodules on the carina of the whorl, coronating the shell; aperture subpentagonal, orange brown, outer lip internally lirate, rather thin; anterior notch quite small, pillar excavated in the middle, bearing three strong folds, a moderate callus on the body; siphonal fasciole distinct, arched, but the umbilicus a mere chink, hardly perceptible in the young. Lon. of shell, 13.5 mm; of last whorl, 9.5 mm; of aperture, 7.0 mm; max. lat. of shell, 8.3 mm.
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake'. (Original description)

Interchangeable taxa

This little species belongs to the same general group as C. minima Reeve, C. Smithii Dall, and C. subangulata Scacchi, but differs by good characters from them all. It has one more columellar fold than C. Smithii, which has fewer and corded varices and no carina on the shoulder of the whorl. Its nearest relative is the Miocene C. scalarina Conrad (non Deshayes) which is less turrited and has a different pillar.
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake'.

Distribution

Off the Carolina coast. In the Gulf of Mexico, in 25 fms., coral, between the delta of the Mississippi and Cedar Keys, Florida.
Author: Jan Delsing

Links and literature

EN Galli C.: WMSDB - Wolrdwide Mollusc Species Data Base July 10, 2013 [http://www.bagniliggia.it/WMSD/WMSDhome....] [as Agatrix agassizii Dall, 1889]
Data retrieved on: 23 November 2013

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