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Taxon profile

species

Pterotyphis pinnatus W. J. Broderip, 1833

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Neogastropoda »  family Muricidae - Muricids »  genus Pterotyphis

Images

Pterotyphis pinnatus

Author: Bayer, F.M.

Pterotyphis pinnatus

Author: Kaicher

Pterotyphis pinnatus

Author: Radwin & D'Attilio

Taxon in country check-lists*

North America: Bahamas, Costa Rica, Mexico, Panama, South America: Caribbean, Colombia

* List of countries might not be complete

Description

The shell is of moderate size (about 20 mm in length) and roughly fusiform. The spire is high and acute, consisting of four convex or weakly subangulate postnuclear whorls and a protoconch of undetermined nature. The suture is strongly impressed. The body whorl is moderately large and fusoid. The aperture is moderately large and ovate, the posterior end somewhat lopsided to the right. The peristome is erect, except for the parietal portion, where it is adherent. Each anal siphonal tube is situated at the periphery of its whorl intervarically, slightly closer to the later varix. The few specimens we have seen have not enabled us to determine whether the siphonal canal is closed or open; the canal is otherwise of moderate length, sinuous, and distally recurved. The body whorl bears three moderately briefly winglike varices. Except for the anal tubes, axial sculpture is not apparent. Spiral sculpture consists of 25 raised, sharply demarcated cords, these distributed from the base of each anal tube to the canal termination, the cords narrower than the interspaces. Finer intercalary threads are interspersed among the stronger cords. Above the periphery of the whorl there are about 12 finer cords extending to the suture. The body cords impart an undulate leading surface to the varical flange. The entire shell has an intritacalx forming the greater part of the close axial growth lamellae, which are strongest between the cords and roll over the cords as fine, scabrous elements. Some of this axial lamellate structure, especially over the receding side of each varix, is bent downward, becoming adherent to the following lamellae, with the result, in some areas, that only oblique pits are apparent. Color is uniformly white in the specimens we have seen.
Radwin, G.E. & D'Attilio, A., 1976. Murex Shells of the World. An Illustrated Guide to the Muricidae.

Distribution

Known to us only from the Bahamas and Panama (Gertman, 1969).
Radwin, G.E. & D'Attilio, A., 1976. Murex Shells of the World. An Illustrated Guide to the Muricidae.
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 Pterotyphis pinnatus (Broderip, 1833)]
Data retrieved on: 23 November 2013

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