Paracomitas protransenna

Paracomitas protransenna is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.[1]

Paracomitas protransenna
Original image of a shell of Paracomitas protransenna
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Neogastropoda
Superfamily: Conoidea
Family: Pseudomelatomidae
Genus: Paracomitas
Species:
P. protransenna
Binomial name
Paracomitas protransenna
(P. Marshall & R. Murdoch, 1923)
Synonyms[1]

† Surcula protransenna P. Marshall & Murdoch, 1923

Description

The length of the shell attains 13 mm, its diameter 5 mm.

(Original description) The small shell is narrowly fusiform. The spire is turreted. The shell contains seven or eight whorls. It shows a strongly projecting rounded keel at middle on the spire-whorls, concave above and below, on the body whorl a well-marked concave area below keel followed by a second keel less pronounced, anterior to this rather abruptly contracted. The aperture and siphonal canal are slightly longer than the spire. The protoconch consists of about 1½ smooth whorls, the lower distinctly carinate, apex blunt. The sutures are linear, margined above and below, variable, some examples indistinct. Sculpture—spirals con sist of numerous fine lines on the keel and above and below it, indistinct in some specimens, on the body whorl usually more pronounced. The axials consist of growthlines only, variable in strength, arcuate between the keel and suture above. The aperture is small, ovate and produced into a long siphonal canal. The outer lip is angled at the keel, thence concave followed by a convexity, and beneath this rapidly narrowing to the siphonal canal. The columella is narrowly callused, straight in the middle portion, narrowing and slightly twisted to the left.[2]

Distribution

This extinct marine species is endemic to New Zealand.

References
  1. MolluscaBase (2018). Paracomitas protransenna (P. Marshall & R. Murdoch, 1923) †. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=831513 on 2019-01-06
  2. P. Marshall & R. Murdoch, Some Tertiary Mollusca, with Descriptions of New Species.; Transactions and Proceedings of the Royal Society of New Zealand , vol. 54, 1923
  • Maxwell, P.A. (2009). Cenozoic Mollusca. pp 232–254 in Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch
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