Chellius piramidalis Vargas-Almonacid & Stuardo, 2007

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: CHAROPIDAE

ESPÉCIE: Chellius piramidalis Vargas-Almonacid & Stuardo, 2007

Tamanho médio: ~3.35 mm

Distribuição: Chile (VIII Región)

Localidade tipo: Chile, VIII Región, Península de Hualpén

Nome original: Chellius piramidalis Vargas-Almonacid & Stuardo, 2007

Etimologia: o nome da espécie é uma referência à forma piramidal da concha

Descrição original:

(Vargas-Almonacid & Stuardo, 2007): “Shell small, pyramidal, shiny light brown coloured with small axial bands of dark brown color regularly distributed among the ribs. Axial sculpture strong, projected by periostracal knife-like structures. Spire convex, with a basal angle of growth regular to rapid, base flat, umbilicated. Apex convex, moderately elevated above the protoconch. Shell with 5 1/2 to 6 1/8 whorls gradually developed in ascendant way. External and internal (umbilical) surfaces covered by 213 and 167 thick, slightly sigmoidal radial ribs, respectively, with basis presenting knife-like crests with an inclination of 45°. Ribs separated at regular intervals by a growth microsculpture formed by 4-11 fine, regularly spaced, secondary radial costellae.

Umbilicus narrow, deep, approximately equal to 1/4 of the largest shell diameter; apparently equivalent to the fecundation chamber of other species. Aperture wider than higher, diagonal, without callosities in the parietal union; peristoma sharp, keel-like resembling a siphostoma. Protoconch smooth, regular, with two whorls abruptly ending where the sculpture begins.”

Fotos: (1) Vargas-Almonacid, P. & Stuardo, J.R. (2007): Universidad de Concepción (UCCC), parátipo, lote não informado na publicação; (2) animal vivo: observação iNaturalist 314886473, Arauco Province, Bio Bio, Chile  Edgardo Flores, 16.ix.2025

Figura: Vargas-Almonacid, P. & Stuardo, J.R. (2007): vistas de um PARATYPE

Fontes:

Descrição original: Vargas-Almonacid, P. & Stuardo, J.R. (2007). Dos géneros nuevos de caracoles terretres (Stylommatophora: Arionacea) de Chile. Revista de Biología Tropical, 55 (2): 693-708.
página(s): 703

Molluscabase: https://molluscabase.org/aphia.php?p=taxdetails&id=1506288