Innesoconcha, IREDALE, 1944

Hyman, Isabel T., Caiza, Jennifer & Köhler, Frank, 2023, Dissecting an island radiation: systematic revision of endemic land snails on Lord Howe Island (Gastropoda: Stylommatophora: Microcystidae), Zoological Journal of the Linnean Society 197 (1), pp. 20-75 : 49

INNESOCONCHA IREDALE, 1944

Innesoconcha Iredale, 1944: 325 .

Type species Helix (Microcystis) catletti Brazier, 1872 (by original designation).

Melloconcha Iredale, 1944: 323 .

Type species Melloconcha delecta Iredale, 1944 (by original designation), synon. nov.

Tribocystis Iredale, 1944: 323 .

Type species Tribocystis rosacea Iredale, 1944 (by original designation), synon. nov.

Annacharis Iredale, 1944: 324 .

Type species Annacharis miranda Iredale, 1944 (by original designation), synon. nov.

Synonymy of Tribocystis and Annacharis with Melloconcha follows Smith (1992).

Description

External morphology: Shell small to medium-sized [shell width(hereafter,SW) 3.7–12.0mm, shellheight (hereafter, SH) 1.8–7.8 mm], 4.5–5.5 whorls, glossy, pale golden to dark amber-brown, sometimes with a darker peripheral band. Shell shape discoidal, trochoidal or domed with a low to elevated spire; whorl profile flattened or rounded above and below a rounded to angulate periphery; sutures weakly impressed to strongly channelled. Protoconch sculptured with incised spiral grooves; teleoconch smooth or sculptured with microscopic spiral grooves. Aperture ovately lunate, width greater than height, lip thin; columella smooth or with a small tooth. Internal walls of early whorls complete; umbilicus closed. Right shell lappet long, narrow, finger-shaped; left shell lappet narrow, finger-shaped, sometimes reduced or absent. Caudal horn moderately small to moderately large; caudal foss a horizontal slit in tail.