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Araucocharopa gallardoi gen. et sp. n. of Charopidae (Gastropoda: Stylommatophora: Punctoidea) from Southern Chile

2008; Museo Argentino de Ciencias Naturales Bernardino Rivadavia e Instituto Nacional de Investigación de las Ciencias Naturales; Linguagem: Inglês

10.22179/revmacn.10.287

1853-0400

Sergio E. Miquel, Francisco Cádiz Lorca,

Helminth infection and control

Araucocharopa gallardoi gen. et sp. n. of Charopidae (Gastropoda: Stylommatophora: Punctoidea) from Southern Chile. Araucocharopa gallardoi gen. et sp. n. from Southern Chile is described. It is characterized by a small trochoid shell (mean diameter: 1.8 mm), 4 ½ - 5 convex whorls, body whorl subcuadrangular; elevated spire (mean height / diameter: 0.74); adult sculpture of high, prominent and vertical 120 axial ribs; periostracal lamelae growing on the axial ribs; protoconch of 1 ¾ whorls with microsculture consisting of 12 spiral costulae with barely visible irregular rings; semilunate aperture descending basally; umbilicus very narrow. The ringed spiral costulae of protoconch is a distinctive feature into the family Charopidae. As part of the discussion, the protoconchs of type species of Stephanoda and Austrodiscus are described for the first time, the embrionic sculpture of S. dissimilis shows irregular axial and spiral fine ribs, and delicate incisurae; in A. twomeyi the protoconch begins smooth, showing axial ribs crossed by fine spirals costulae, not well separated from teleoconch.