Acrilla semicostata

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

Acrilla semicostata
Shell of † Acrilla semicostata (specimen at MNHN, Paris)
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Superfamily: Epitonioidea
Family: Epitoniidae
Genus: Acrilla
Species:
†A. semicostata
Binomial name
†Acrilla semicostata
(J. Sowerby, 1814)
Synonyms
  • † Amaea (Acrilla) semicostata (J.Sowerby, 1814) superseded combination
  • † Scalaria semicostata J. Sowerby, 1814 superseded combination

Description

(Original description) The seven whorls are contiguous. The spire is transversely striated with numerous, slightly raised ribs. The lower part of each whorl is smooth and naked. The ribs scarcely cover two-thirds of each whorl. [2]

Distribution

Fossils of this marine species have been found in Eocene strata in Val-d'Oise, France and in Barton on Sea, Great-Britain.

References
  1. WoRMS. "Acrilla semicostata (J. Sowerby, 1814) †". World Register of Marine Species. Retrieved 16 March 2024.
  2. Sowerby, J. (1812-1815). The mineral conchology of Great Britain; or coloured figures and descriptions of those remains of testaceous animals or shells, which have been preserved at various times and depths in the earth (Vol. I). London, privately published, pp. i-vii, 9-234 + index This article incorporates text from this source, which is in the public domain.
  • Cossmann (M.) & Pissarro (G.), 1907 - Iconographie complète des coquilles fossiles de l'Éocène des environs de Paris, t. 2, p. pl. 1-9 (
  • Le Renard (J.) & Pacaud (J.-M.), 1995 - Révision des Mollusques paléogènes du Bassin de Paris. 2 - Liste des références primaires des espèces. Cossmanniana, t. 3, vol. 3, p. 65-132


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