Crassispira oxyacrum

Crassispira oxyacrum
Shells of Crassispira oxyacrum (specimen at MNHN, Paris)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Conoidea
Family:	Pseudomelatomidae
Genus:	Crassispira
Species:	C. oxyacrum
Binomial name
Crassispira oxyacrum (Cossmann, 1889)
Synonyms
Crassispira (Tripla) oxyacrum(Cossmann, 1889) † Drillia (Tripla) oxyacrumCossmann, 1889

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

Description

The length of the shell attains 7 mm; its diameter 2 mm.

(Original description in French) The shell is small and spindle-shaped, with a smooth, conical apex culminating in a minute point. In addition to the embryonic whorls, six convex whorls are present, each displaying a subtle angularity. These whorls are adorned with small, oblique ribs that curve backward towards the right, forming a row of bead-like structures along the lower suture. These ribs are further embellished by five prominent, alternating cords, particularly noticeable at the base of the shell, where the ribs often bifurcate. The body whorl constitutes approximately half the total shell length. The siphonal canal is very short, relatively wide, and twisted. The columella exhibits a slight callus, and the outer lip is notched near the suture. ^[2]

Distribution

Fossils have been found in Eocene strata in the Paris Basin, France.

References

1. MNHN, Paris: Crassispira oxyacrum
2. Cossmann (M.), 1889 Catalogue illustré des coquilles fossiles de l'Éocène des environs de Paris (4ème fascicule). Annales de la Société royale Malacologique de Belgique, t. 24, p. 3-385 This article incorporates text from this source, which is in the public domain .

• Cossmann (M.) & Pissarro (G.), 1913 Iconographie complète des coquilles fossiles de l'Éocène des environs de Paris, t. 2, p. pl. 46-65
• Brébion (P.), 1992 Quelques Cônes et Pleurotomes du Lutétien du Bassin de Paris. Cossmanniana, hors série, vol. 1, p. 1-25
• 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

External links

• MNHN: Drillia (Tripia) oxyacrumCossmann, 1889
• Pacaud J.M. & Le Renard J. (1995). Révision des Mollusques paléogènes du Bassin de Paris. IV- Liste systématique actualisée. Cossmanniana. 3(4): 151-187