Cyclopedus anselini, Gargominy & Muratov, 2012

Gargominy, Olivier & Muratov, Igor V., 2012, New taxa of land snails from French Guiana, Zoosystema 34 (4), pp. 783-792 : 785-786

publication ID

https://doi.org/ 10.5252/z2012n4a7

persistent identifier

https://treatment.plazi.org/id/03968781-8D02-FFBE-FF19-FBE3FDCAFAB8

treatment provided by

Felipe

scientific name

Cyclopedus anselini
status

sp. nov.

Cyclopedus anselini View in CoL n. sp.

( Fig. 2 View FIG )

TYPE MATERIAL. — Holotype: French Guiana, Réserve naturelle des Nouragues, Nouragues field station (c. 4°05’N, 52°41’W; N10 square), 140 m a.s.l., T. E. J. Ripken & O. Gargominy, 11.XI.1997, leaf litter on lateritic soil in a natural forest gap ( INVMAR21029 ), MNHN 25066 About MNHN GoogleMaps . Paratypes: same data as holotype, 1 specimen used for SEM photographs, MNHN 25067 About MNHN . — Same data, but M12 square, 08.XI.1997, leaf litter on lateritic soil ( INVMAR21021 ), 1 specimen, MNHN 25138 About MNHN . — Same data, but N15 square, 155 m a.s.l., 15.XI.1997, leaf litter in buttresses of tree (tree code N-15-138) ( INVMAR21038 ), 1 specimen, MNHN 25139 About MNHN GoogleMaps .

OTHER MATERIAL EXAMINED. — Same data as paratype MNHN 25139, 3 damaged shells ( MNHN).

TYPE LOCALITY. — Nouragues field station (c. 4°05’N, 52°41’W), Réserve naturelle des Nouragues, French Guiana.

ETYMOLOGY. — This species is dedicated to Anselin Baradat for the most powerful bond that ties him with the first author.

DIAGNOSIS. — A small South American cyclophoroid species (less than 3.5 mm in height and less than 4.2 mm in diameter) characterised by its unique teleoconch sculpture of fine impressed dots arranged in spiral lines. Operculum almost circular, without any visible steps on both sides, with elevated translucent lamellae expanded at the summit and connected to the succeeding whorl, thus forming a completely closed channel in cross section.

DESCRIPTION (HOLOTYPE)

Shell small (height 3.2 mm, major diameter 3.7 mm), umbilicate,dextral,broadly conical with straight outline, elevated, rather thin, light corneous, semi-translucent. Whorls 3.9, 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 four varices (discontinuity in growth) in the first 3+ whorls; 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 almost detached from it. Peristome almost complete, simple, acute,not reflected.Umbilicus open, 5.5times smaller than major diameter, V-shaped.

Operculum almost circular (1.8× 1.7 mm), corneous, externally concave and internally convex,spirally coiled having the elevated translucent lamellae expanded at the summit and connected to the succeeding whorl, thus forming completely closed channel in cross section.

HABITAT. — Primary forest,under leaf litter on lateritic soil.

REMARKS

The holotype is somewhat juvenile but was chosen as the operculum was available. In fully grown specimens, the aperture is clearly delineated from the penultimate whorl although not detached.

By comparison with species listed by Torre et al. (1942), Cyclopedus anselini n. gen., n. sp. seems to be the smallest known cyclophoroid in the western hemisphere.

Clade STYLOMMATOPHORA Schmidt, 1855 View in CoL Super-family TESTACELLOIDEA Gray, 1840 Family SPIRAXIDAE Baker, 1939 View in CoL Subfamily SPIRAXINAE Baker, 1939 View in CoL

T

Tavera, Department of Geology and Geophysics

MNHN

Museum National d'Histoire Naturelle

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Neocyclotidae

Genus

Cyclopedus

Loc

Cyclopedus anselini

Gargominy, Olivier & Muratov, Igor V. 2012
2012
Loc

SPIRAXIDAE

Baker 1939
1939
Loc

SPIRAXINAE

Baker 1939
1939
Loc

STYLOMMATOPHORA

Schmidt 1855
1855
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