Lilloiconcha laevigata, Hausdorf, 2005

Hausdorf, Bernhard, 2005, The genus Lilloiconcha in Colombia (Gastropoda: Charopidae), Journal of Natural History 39 (30), pp. 2795-2808 : 2802-2803

Lilloiconcha laevigata sp. n.

( Figures 2 , 6, 7 , 16–20 , 21 )

Diagnosis

Lilloiconcha laevigata differs from Lilloiconcha costulata in the lack of ribs and the on average larger shell with more whorls. It also differs from other Lilloiconcha species in the lack of ribs.

Shell ( Figures 2 , 6, 7 )

Depressed conical-globular; with 4–4.25 convex whorls; protoconch with indistinct microscopical spiral striae; teleoconch with a reticulate pattern consisting of fine growth-striae and dense microscopical spiral threads; brownish corneous with reddish brown transverse stripes; body whorl rounded; aperture almost circular; upper insertion of the peristome not descending towards the aperture; suture impressed; peristome sharp, neither expanded nor thickened; umbilicus wide, taking about 22–30% of the shell diameter.

Measurements

La Calera, 0.5 km towards Bogotá (n 520): D53.223.7 mm, Ø53.5¡ 0.1 mm; H52.122.5 mm, Ø52.3¡ 0.1 mm; D/H51.3821.64, Ø51.50¡0.06.

Anatomy ( Figures 16–20 )

Only the radula of one paratype from La Calera, 0.5 km towards Bogotá ( ZMH 4068 ) could be examined. The tricuspid central teeth are narrower and shorter than the adjacent lateral teeth. The slender central cusps of the central teeth are more than twice as long as the side cusps. The central cusp of the tricuspid lateral teeth is shifted backwards. It is connected with the large and strongly curved side cusps with a low bridge which begins between the bases of the side cusps with an apparent extra denticle, sometimes with two tips. Towards the periphery the endocone of the lateral teeth increases and approximates the mesocone. At the transition to the marginal teeth extra denticles develop next to the ectocone so that the marginal teeth are multicuspid .

Etymology

The specific epithet refers to the comparatively smooth (Latin laevigatus) shell which characterizes the species.

Type locality

Colombia, Cundinamarca: La Calera, 0.5 km towards Bogota´, farm Las Cabreras, Vereda San Rafael, Andean forest , N slope, 2840 m altitude, 04 ° 429300N, 73 ° 589200W .

Distribution ( Figure 21 )

Lilloiconcha laevigata is known from Andean forests at 2820–3430 m altitude in the Departamento Cundinamarca in Colombia. Lilloiconcha laevigata and Lilloiconcha costulata occur sympatrically at the type locality of both species near La Calera.

Material

Colombia, Cundinamarca: La Calera, 0.5 km towards Bogota´, farm Las Cabreras , Vereda San Rafael , 2820–2840 m altitude, 04 ° 429300N, 73 ° 589200W (holotype ZMH 4792 , leg. B. Hausdorf, 11 March 2000, measurements: D 53.6 mm, H 52.5 mm; UNAL; ZMH 4020 , 4036 , 4068 ); Subachoque towards radar station at El Tablazo, chusque forest, S slope, 3430 m altitude, 05 ° 009390N, 74 ° 119380W ( ZMH 4284 ) .

Figures

Figure 21. Distribution of Lilloiconcha species in central Colombia (29-squares). L. costulata, sp. n. ($), L. laevigata, sp. n. (q), and L. gordurasensis (Thiele) (m).

Figures 1–3. Lilloiconcha spp. from Colombia, shells. (1) Lilloiconcha costulata, sp. n., Colombia, Cundinamarca: La Calera, 0.5 km towards Bogotá (holotype ZMH 4793). (2) Lilloiconcha laevigata, sp. n., Colombia, Cundinamarca: La Calera, 0.5 km towards Bogotá (holotype ZMH 4792). (3) Lilloiconcha gordurasensis (Thiele), Colombia, Boyaca´: Barbosa, 5 km towards Arcabuco (ZMH 4185). Scale bar: 1 mm.

Figures 4–9. Lilloiconcha spp. (4, 5) Lilloiconcha costulata, sp. n., Colombia, Cundinamarca: La Calera, 0.5 km towards Bogotá (holotype ZMH 4793): (4) protoconch; (5) sculpture of the body whorl. (6, 7) Lilloiconcha laevigata, sp. n., Colombia, Cundinamarca: La Calera, 0.5 km towards Bogotá (holotype ZMH 4792): (6) protoconch; (7) sculpture of the body whorl. (8, 9) Lilloiconcha gordurasensis (Thiele), Colombia, Boyaca´: Barbosa, 5 km towards Arcabuco (ZMH 4185): (8) protoconch; (9) sculpture of the body whorl. Scale bars: 0.1 mm (4, 6, 8); 0.05 mm (5, 7, 9).

Figures 13–20. Lilloiconcha species from Colombia, radulae. (13–15) Lilloiconcha costulata, sp. n., Colombia, Cundinamarca: La Calera, S of Entrada Fabrica de Cemento Samper (paratype ZMH 4083): (13) central and adjacent lateral teeth; (14, 15) lateral teeth. (16–20) Lilloiconcha laevigata, sp. n., Colombia, Cundinamarca: La Calera, 0.5 km towards Bogotá (paratype ZMH 4068): (16, 17) central and adjacent lateral teeth; (18) outer lateral and first marginal teeth; (19) marginal teeth; (20) marginal and outer lateral teeth. Scale bars: 2 mm (13–16); 5 mm (17–20).