Coelostylinidae Cossmann, 1909

Hausmann, Imelda M., Nützel, Alexander, Roden, Vanessa Julie & Reich, Mike, 2021, Palaeoecology of tropical marine invertebrate assemblages from the Late Triassic of Misurina, Dolomites, Italy, Acta Palaeontologica Polonica 66 (1), pp. 143-192 : 153

Family Coelostylinidae Cossmann, 1909 Genus Coelostylina Kittl, 1894

Type species: Melania conica Münster, 1841 ; Italy, Late Triassic.

Emended diagnosis.—Shell acute conical, medium-sized; last whorl higher than spire; whorls moderately convex with narrow shoulder; sutures distinctly impressed; whorls smooth or with very faint spiral ornament including spirally arranged micro-pits and furrows; growth lines slightly opisthocyrt to orthocline; base convex, not demarcated from whorl face; base minutely phaneromphalous; aperture higher than wide, with straight columellar lip and convex outer lip; protoconch conical, orthostrophic, smooth; protoconch whorls convex, without shoulder, demarcated from teleoconch by a distinct sinusigera.

Remarks.—The re-investigation of Münster’s (1841) type specimen and the well-preserved material at hand allow a sharper diagnosis of the genus Coelostylina which has been used as a dustbin taxon for many years.