Turbonilla bartolomensis

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Turbonilla bartolomensis
Turbonilla bartolomensis 001.png
Drawing of a shell of Turbonilla bartolomensis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Family: Pyramidellidae
Genus: Turbonilla
Species:
T. bartolomensis
Binomial name
Turbonilla bartolomensis
Bartsch, 1917 [1]
Synonyms

Turbonilla (Pyrgiscus) bartolomensis Bartsch, 1917

Turbonilla bartolomensis is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. [2] [3]

Contents

Description

The yellow shell has a conic shape. Its length measures 5.6 mm. The whorls of the protoconch are decollated. The nine whorls of the teleoconch are appressed at the summit, flattened in the middle, except the last, which is inflated and strongly rounded. The whorls are marked by rather strong, well-rounded axial ribs, which are slightly retractively slanting on the early turns and decidedly so on the later volutions. The intercostal spaces about as wide as the ribs marked by 12 deeply incised spiral pits. Of these the fifth is a mere line, while the first four, the sixth, ninth, and tenth are about twice as wide, and the eighth and ninth and eleventh and twelfth form deep broad pits fully three times the width of the last. The suture is moderately constricted. The periphery of the body whorl is strongly inflated, and well rounded. The base of the shell is short, inflated, and well rounded. It is marked by the continuations of the axial ribs, which extend strongly to the umbilical area, between which poorly defined spiral striations may be seen. The aperture is short and broadly oval. The posterior angle is obtuse. The outer lip is thin, showing the external sculpture within. The inner lip is short, partly reflected, free, and provided with an obsolete oblique internal fold at its insertion. The parietal wall is covered by a very thick callus, which renders the peristome complete. [1]

Distribution

The type specimen was found in the Pacific Ocean off San Bartolome Bay, Baja California

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References

  1. 1 2 P. Bartsch (1917), Descriptions of new west American marine mollusks and notes on previously described forms; Proceedings of the United States National Museum, vol.52; ISSN   0096-3801; p.653
  2. ↑ Rosenberg, G. (2012). Turbonilla bartolomensis Bartsch, 1917. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=575972 on 2012-03-01
  3. ↑ Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064
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