Cyclopedus, Gargominy & Muratov, 2012

Gargominy, Olivier & Muratov, Igor V., 2012, New taxa of land snails from French Guiana, Zoosystema 34 (4), pp. 783-792 : 784-785

Genus Cyclopedus n. gen.

TYPE SPECIES. — Cyclopedus anselini n. sp. by monotypy.

ETYMOLOGY.— From the Greek, “cyclo-” for circle, which refers to the perfect spire of the shell and is related to the names of other genera in this super-family, “-pedus” for child, which refers to the small size of the shell. Cyclopède is also a dedication to the French humorist Pierre Desproges.

DIAGNOSIS. — Genus characterised by the small shell size and unique teleoconch sculpture of fine impressed dots arranged in spiral lines. Operculum similar to that of Ptychocochlis Simpson, 1895 in having elevated translucent lamellae expanded at the summit and connected to the succeeding whorl, thus forming a completely closed channel in cross section. However, in Ptychocochlis these lamellae form visible steps on the outer surface of the operculum, while in Cyclopedus n. gen. this surface is flat. DESCRIPTION

Shell small (height from 3.0to 3.5mm,major diameter from 3.6 to 4.2 mm), umbilicate, dextral, broadly conical with straight outline, elevated, rather thin, light corneous, semi-translucent. Whorls 3.8-4.0, regularly rounded with a deep straight suture all the way to the aperture. Protoconch two whorls, with eight spiral flat ribs.Protoconch/teleoconch transition distinct because of change in microsculpture and discontinuity of growth. Surface of teleoconch with growth lines and occasional varices (discontinuity in growth); sculpture of fine impressed dots arranged in spiral lines irregularly spaced from 0.1 to 0.75 mm and inconspicuous ribs (about 40 on the body whorl) separated by 5-10 growth lines.Aperture circular, not cut by penultimate whorl and clearly delineated but not detached from it in fully grown specimens.Peristome complete,simple,acute,not reflected.Umbilicus open, 5.5 times smaller than major diameter, V-shaped.

Operculum almost circular (about 1.8 mm in diameter), corneous, externally concave and internally convex,without any visible steps on both sides,spirally coiled, with elevated translucent lamellae expanded at the summit and connected to the succeeding whorl, thus forming completely closed channel in cross section.