Lilloiconcha gordurasensis ( Thiele, 1927 )

Hausdorf, Bernhard, 2005, The genus Lilloiconcha in Colombia (Gastropoda: Charopidae), Journal of Natural History 39 (30), pp. 2795-2808 : 2804

Lilloiconcha gordurasensis ( Thiele, 1927)

( Figures 3 , 8, 9 , 21 , 22 )

Endodonta gordurasensis Thiele 1927 p 321 , Plate 26 Figure 19 . Type locality: ‘‘Gorduras’’,

Brazil. Amphidoxa gordurasensis: Jaeckel 1952, p 330 . Radiodiscus (Radiodiscus) gordurasensis: Haas 1959, p 365 , 366. Austrodiscus golbachi Hylton Scott 1963, p 51 , Figure 2 . Type locality: ‘‘Quebrada de

Cainzo, Tucumán’’, Argentina. Zilchogyra gordurasensis: Weyrauch 1965, p 122 . Zilchogyra golbachi: Weyrauch 1965, p 122 . Trochogyra (Trochogyra) gordurasensis: Fonseca and Thomé 1993, p 103 . Zilchogyra gordurasensis: Miquel et al. 2004, p 930 .

Diagnosis

Lilloiconcha gordurasensis differs from the other Columbian Lilloiconcha species in the on average smaller, more depressed shell with coarser and denser ribs and a wider umbilicus.

Shell ( Figures 3 , 8, 9 )

Depressed conical-globular; with 3.75–4.25 convex whorls; protoconch with distinct microscopical spiral threads; teleoconch with coarse and regular ribs (10–13 per 1 mm of the body whorl) and a reticulate pattern consisting of fine growth-striae and dense microscopical spiral threads between the ribs; 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 very wide, taking about 34–38% of the shell diameter.

Measurements

Various localities (n 56): D52.523.0 mm, Ø52.8¡ 0.2 mm; H51.521.9 mm, Ø5 1.8¡ 0.2 mm; D/H51.5321.71, Ø51.59¡0.08.

Distribution ( Figures 21 , 22 )

Lilloiconcha gordurasensis was known so far from eastern Brazil, Paraguay and north-western Argentina ( Thiele 1927; Jaeckel 1952; Haas 1959; Hylton Scott 1963; Miquel et al. 2004). In Colombia it was found in Andean forests at 1700–1840 m altitude in the Departamentos Cundinamarca and Boyaca´. The occurrences in Colombia represent the highest localities from which Lilloiconcha gordurasensis has been recorded. The species has also been discovered in the Departamentos San Martín and Huánuco in Peru by Z. Guevara.

Material

Colombia, Cundinamarca: La Mesa, 12 km towards Bogota´, Los Alpes near El Rosario, W slope with forest, 1700 m altitude, 04 ° 409140N, 74 ° 239430W ( UNAL; ZMH 4317 ) . Colombia, Boyaca´: Barbosa, 5 km towards Arcabuco, forest near quarry El Cairo in Vereda Pueblo Viejo , 1840 m altitude, 05 ° 539550N, 73 ° 359080W ( ZMH 4185 ) . Peru, San Martín: Moyobamba, Jepelacio, Carrizal , 22 km SE of Moyobamba, 100 m altitude, 06 ° 139040S, 76 ° 549550W ( ZMH 10004) ; Moyobamba, Jepelacio, Carrizal , 23 km SE of Moyobamba, 200 m altitude, 06 ° 149060S, 76 ° 549520W ( ZMH 10039) ; Rioja, Belén , 29 km SW of Moyobamba, 450 m altitude, 06 ° 129270S, 77 ° 099280W ( ZMH 10070) ; Rioja, Belén , 27 km SW of Moyobamba, 500 m altitude, 06 ° 129260S, 77 ° 099270W ( ZMH 10092) ; Rioja, Florida , 40 km NW of Moyobamba, 500 m altitude, 05 ° 579320S, 77 ° 189420W ( ZMH 10218) . Peru, Huánuco: Río Oro , 5 km SW of Tingo Maria (Parque Nacional Tingo Maria), 550 m altitude, 09 ° 209120S, 76 ° 029120W ( ZMH 10536) . Brazil, Pernambuco: Goyanna , 30 m altitude, 7 ° 339S, 34 ° 599W ( ZMB 90828, specimen to Jaeckel 1952) . Brazil, Minas Gerais: Gordura, 730 m altitude, 20 ° 399S, 46 ° 229W ( SMF 3985 , holotype of Endodonta gordurasensis Thiele, 1927 ) . Brazil, Parana´: Pinhal Prêto, 610 m altitude, 25 ° 379S, 52 ° 279W ( Haas 1959) . Brazil, Santa Catarina: São Carlos, 300 m altitude, 27 ° 049S, 52 ° 599W ( Haas 1959) ; Nova Teutônia, 640 m altitude, 27 ° 119S, 52 ° 239W ( Haas 1959). Brazil, Rio Grande do Sul: São Francisco de Paula, Centro de Pesquisas e Conservação da Natureza Pró-Mata , 891 m, 29 ° 299040S, 50 ° 129590W ( Miquel et al. 2004) . Paraguay, Guaira´: Villarrica, 130 m altitude, 25 ° 459S, 56 ° 269W ( Hylton Scott 1963) . Argentina, Jujuy: Banda de los Perales, San Salvador de Jujuy, 26 ° 109S, 65 ° 189W ( Hylton Scott 1963) . Argentina, Tucumán: Tucumán, 430 m altitude, 26 ° 499S, 65 ° 139W ( MLP, paratype of Austrodiscus golbachi Hylton Scott, 1963 ) ; Quebrada de Cainzo , Tucumán ( MLP, holotype and paratype of Austrodiscus golbachi Hylton Scott, 1963 ) ; Tucumán towards Tafí del Valle, valley of the Río Las Sosas , 600–1400 m altitude ( Weyrauch 1965) .

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).

Figure 22. Distribution of Lilloiconcha gordurasensis (Thiele) in South America (2°-grid).

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).