Smenodonta janeirensis (Pfeiffer, 1852)

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: SCOLODONTIDAE

ESPÉCIE: Smenodonta janeirensis (Pfeiffer, 1852)

Tamanho médio: 9 mm

Distribuição: Rio de Janeiro

Localidade tipo: Rio de Janeiro, Brasil

Nome original: Helix janeirensis L. Pfeiffer, 1852

Sinônimos: Entodina janeirensis (Pfeiffer, 1852); Systropia (Entodina) janeirensis (Pfeiffer, 1852); Systrophia janeirensis; Streptaxis crossei L. Pfeiffer, 1867; Streptartemon crossei

Redescrição:

(Roosen, Salvador & Breure, 2025): “Shell small, width c. 10 mm, conical, with a stepped spire. Whorls 7–8, tightly coiled, with an angulation forming a shoulder. Suture well marked. Protoconch 2½ whorls, smooth; transition to teleoconch distinct. Teleoconch sculptured by strong, regularly-spaced, prosocline ribs that extend from the whorl angulation to the suture; faint ribbing may also be present immediately around umbilicus. Body whorl bend abapically immediately before the aperture in adults. Peristome slightly thickened and reflected. Aperture narrow, prosocline, D-shaped. Apertural barriers: basal/palatal barrier very weak; palatal tooth; parietal barrier long, bearing its own transversal plicae. Umbilicus c. 20% of shell width, deep.”

Fotos: (1,2) Natural History Museum, London: SYNTYPE de Helix janeirensis L. Pfeiffer, 1852, NHMUK 1859.5.2.1, Rio de Janeiro, doador John MacGillivray, expedição: Voyage of H.M.S. Rattlesnake, i.1847; (3) Museu Nacional de História Natural, Paris. SYNTYPE de Streptaxis crossei L. Pfeiffer, 1867; MNHN-IM-2000-30920

Fontes:

Descrição original: (como Helix janeirensis L. Pfeiffer, 1852) Pfeiffer, L. (1852). Neue Heliceen. Zeitschrift für Malakozoologie. 8 (8): 127-128. Cassel [between October and December]., disponível online em https://www.biodiversitylibrary.org/page/16300627
página(s): 128

Simone, L. R. L. (2006). Land and Freshwater Molluscs of Brazil. Editora Gráfica Bernardi, FAPESP. São Paulo, 390 pp. página(s): 224

Roosen, Salvador & Breure, 2025. Revision of the genera of Scolodontidae, part 3: Entodina Ancey, 1887, Keranella gen. nov., Martinella Jousseaume, 1887, †Patagocharopa Miquel & P.E. Rodriguez, 2016, Polygyratia Gray, 1847, Ridleyconcha Christensen, 2020, Smenodonta gen. nov., Systrophia L. Pfeiffer, 1855, and Zilchistrophia Weyrauch, 1960. Journal of Conchology. Vol. 45, no. 3

Salvador, Rodrigo & Miranda, Marcel & Santos, Fernanda & Oliveira, Cléo & Arruda, Janine & Cavallari, Daniel & Gomes, Suzete & La Pasta, Ariel & Pena, Meire & Ovando, Ximena & Rosa, Rafael & Salles, Anna Caroline & Santos, Sonia & Simone, Luiz & Marcondes Machado, Fabrizio. (2024). Checklist of the terrestrial gastropods of Brazil. Journal of Conchology. 45. 142-185

Molluscabase: https://www.molluscabase.org/aphia.php?p=taxdetails&id=1424829