Acrilla affinis

Acrilla affinis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Superfamily:	Epitonioidea
Family:	Epitoniidae
Genus:	Acrilla
Species:	†A. affinis
Binomial name
	†Acrilla affinis; (Deshayes, 1861)
Synonyms
	† Amaea (Acrilla) affinis (Deshayes, 1861) superseded combination; † Scalaria affinis Deshayes, 1861 superseded combination;

Acrilla affinis is an extinct species of sea snail, a marine gastropod mollusk in the family Epitoniidae, the wentletraps.^[1]

Description

(Original description in French) This is an elongated, turriculated, narrow shell, with fifteen to sixteen convex whorls, joined by a fairly deep but not canaliculated suture. The surface is decorated with a large number of longitudinal, thin, equal and regular ribs. They are straight for the greater part of their length, but reaching the vicinity of the suture, their lower end bends sharply, forming a small auricle. At the opposite end, they stop abruptly at the suture. The rather narrow interstices of the ribs show under the magnifying glass very fine transverse striations, obsolete, but of admirable regularity. The body whorl is short and subglobose. It carries at the base a disc with an angular edge entirely hidden by the suture, while in the multilamella it overflows and produces a small bulge in the suture. On this disc, small radiating and curved ribs can be seen, between which very fine concentric streaks can be seen. A circular aperture with continuous edges ends the body whorl. ^[2]

Distribution

Fossils have been found in Eocene strata in Seine-et-Marne, France.

References

^ WoRMS. "Acrilla affinis (Deshayes, 1861) †". World Register of Marine Species. Retrieved 14 March 2024.
^ Deshayes, G. P. (1861-1864). Description des animaux sans vertèbres découverts dans le bassin de Paris pour servir de supplément à la Description des coquilles fossiles des environs de Paris comprenant une revue générale de toutes les espèces actuellement connues. Tome deuxiéme. Mollusques acéphalés monomyaires et Brachiopodes. Mollusques céphalés, Première partie. 1-968, pls 1-62. Paris, Baillière. This article incorporates text from this source, which is in the public domain.

External links

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[WoRMS-1] WoRMS. "Acrilla affinis (Deshayes, 1861) †". World Register of Marine Species. Retrieved 14 March 2024.

[2] Deshayes, G. P. (1861-1864). Description des animaux sans vertèbres découverts dans le bassin de Paris pour servir de supplément à la Description des coquilles fossiles des environs de Paris comprenant une revue générale de toutes les espèces actuellement connues. Tome deuxiéme. Mollusques acéphalés monomyaires et Brachiopodes. Mollusques céphalés, Première partie. 1-968, pls 1-62. Paris, Baillière. This article incorporates text from this source, which is in the public domain.

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