Zilchogyra franzi Weyrauch, 1965

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: CYSTOPELTIDAE

ESPÉCIE: Zilchogyra franzi Weyrauch, 1965

Tamanho médio: 4.3 – 5.4 mm

Distribuição: Argentina (Província de Buenos Aires)

Localidade tipo: Sierra de la Ventana, Província de Buenos Aires, Argentina

Nome original: Zilchogyra franzi Weyrauch, 1965

Redescrição:

(Delhey, Piza & Burela, 2010): “Shell depressed, discoidal flat with 4.3 to 4.9 markedly convex, gradually expanding whorls with deeply channelled sutures; semitranslucent, thin and fragile, with glossy, brownish periostracum. Major diameter ranging from 4.3 to 5.4 mm, shell height from 1.6 to 2.6 mm. Spire almost flat, slightly protruded (5–20% of shell height); most shells with only the first whorls visible in lateral view. Degree of descent of last whorl ranging from 20 to 40%. Protoconch with 1.4 to 1.8 whorls, smooth, sometimes with rudimentary axial ribs in its distal portion.

Teleoconch with axial ribs and intercostal microsculpture consisting of regularly spaced axial striae and weaker spiral lines, visible only under strong magnification. Axial ribs curved and retractive, distally with translucent periostracal projections, observable only in well preserved shells. Last whorl with 45 to 56 ribs (3.1 to 4.4 ribs per mm) and 6 to 14 axial striae in each intercostal space. Aperture subcircular, little excised by the last whorl. Peristome sharp, not expanded. Umbilicus wide, extending over about 36–50% of the shell width. Animal: Body colour greyish and
dotted”

Fotos: (1,2) Delhey, Piza & Burela, 2010: Fundación Miguel Liló, HOLOTYPE FML 1217

Fontes:

Descrição original: Weyrauch, W.K. (1965b) Cinco nuevos Endodóntidos de Argentina y Perú. Neotropica, 11, 105–115

Delhey, V. K.; Piza, J.; Burela, S. (2010). Zilchogyra franzi Weyrauch, 1965 (Gastropoda: Charopidae), a minute landsnail rediscovered in Sierra de la Ventana (Southern Pampas, Argentina). Zootaxa. 2450: 61-64

Molluscabase: https://molluscabase.org/aphia.php?p=taxdetails&id=1347867