Class Gastropoda Cuvier, 1795
Family Rissoidae Gray, 1847
Genus Pusillina Monterosato, 1884
Species Pusillina sulzeriana (Risso, 1826)
Pusillina sulzeriana (Risso, 1826)
Very common in the surroundings of San Gimignano (Siena). Pliocene (Piacenzian).
Gastropoda Rissoidae Pusillina Pusillina sulzeriana Pliocene
Original Description – Descrizione originale
(O.D.) A. Testa opaca, glabra, nitida; anfractubus setem, transversim costatis, costis convexis, intertitiis lineis angustis impressis sculptis.
Cette espèces, qui portera le nom du savant docteur Sulzer, es opaque, lisse, luisante; à sept tours de spire costulés en travers; les côtes sont convexes, avec les interstices sculptés de lignes fort étroites. Long. 0,005. Se trouve subfossile.
Conchiglia piccola, robusta, formata da 6-7 giri convessi, separati da suture poco profonde. I giri della teleoconca sono ornati da 14-16 coste assiali, assenti sui primi giri, robuste, poco arcuate e separate da intervalli altrettanto ampi. Strie spirali più o meno profonde, più marcate sulla periferia dell’ultimo giro. Ultimo giro alto 2/3 dell’altezza totale con coste obliterate presso l’apertura e sulla base. Apertura grande, subcircolare e posteriormente ristretta. Labbro esterno semplice, tagliente internamente liscio. Bordo columellare liscio con callo poco esteso (Chirli 2006).
Shell small but robust, formed by 6-7 convex whorls, separated by shallow sutures. Teleoconch with axial ornamentation consisting in 14-16 ribs, absent on the first whorls, strong, slightly arched and separated by equally wide intervals. Spiral threads more or less deep, more evident on the periphery of the last whorl. Last whorl 2/3 of the total height with ribs obliterated at the aperture and on the base. Large, subcircular and posteriorly restricted oral opening. External lip, internally smooth, simplex with cutting edge. Smooth columellar border with slightly extended callus.
Bibliographic references and some more common synonyms
1826 Alvania sulzeriana – Risso, 1826: p. 145, n. 365, pl. 9, fig. 124
1895 Rissoia (Apicularia) sulzeriana v. villavernensis – Sacco, p. 21, fig. 46
1895 Rissoia (Apicularia) sulzeriana v. sublaevis – Sacco, 21, fig. 47
1895 Rissoia (Apicularia) sulzeriana v. perlaevis – Sacco, 21, fig. 48
2006 Pusillina sulzeriana – Chirli, p. 49, pl. 22, figs 8-12
2008 Pusillina sulzeriana – Chirli & Linse, p. 72, pl. 18, figs 6a-c
2021 Pusillina sulzeriana – Chirli & Forli, p. 61, pls 44, 45, figs. B1-15, A1-10
Remarks
In WoRMS is placed in Genus Rissoina d’Orbigny, 1841
Stratigraphic distribution
Pliocene – very common in Italy. Pleistocene – Italy and Greece (Rhodes).
References
Chirli C. (2006). Malacofauna Pliocenica Toscana – Caenogastropoda. Vol. 5, pp. 144, 46 Plates.
Chirli C. & Linse U. (2011). The Pleistocene Marine Gastropods of Rhodes Island (Greece). Tavarnelle, The authors. 447 pp.; 90 plates.
Risso A. (1826). Histoire naturelle des principales productions de l’Europe méridionale et particulièrement de celles des environs de Nice et des Alpes Maritimes, vol. 4. Paris: Levrault. vii + 439 pp., pls 1-12. , available online at https://biodiversitylibrary.org/page/50455192
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Acknowledgements
Si ringrazia l’amico Carlo Chirli (Tavarnelle, Firenze) per la concessione all’uso di alcuni suoi testi. See also Edizioni Danaus.
