Thaumastus chalamarcaensis Breure & Mogollón, 2025

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: MEGASPIRIDAE

ESPÉCIE: Thaumastus chalamarcaensis Breure & Mogollón, 2025

Tamanho médio: 47 mm

Ocorrência: Peru (Cajamarca)

Localidade tipo: Peru, Departamento de Cajamarca, “Chota Province, Chalamarca District, Centro Poblado
Mayor El Verde, Cerro Sugarorco”

Altitude: 2989 – 3052 m

Nome original: Thaumastus (Thaumastiella) chalamarcaensis Breure & Mogollón, 2025

Etimologia: o nome da espécie é uma referência à localidade tipo

Descrição original:

(Breure & Mogollón, 2025): “Shell up to 47.2 mm, 1.97 times as long as wide, elongate, rather solid; rimate. Sculptured with irregularly spaced, thickened growth-striae, in between with weaker incrassate striae, and spiral rows of oblong granules, especially on the upper part of the last two whorls. Protoconch sculptured with axial riblets, which become wavy, anastomosing and irregularly broken up into bead-like to oblong granules on the second whorl. Towards the transition to the teleoconch the granules become more densely spaced.

Colour pinkish-violet with brownish, axial streaks, intermingled with yellowish in an irregular pattern, overlaying the brown, especially on the last whorls. A dark yellow-browish girdle at the periphery underneath the light yellow axial streaks. Whorls 5.5, somewhat convex, the last one 0.57 the total length, spire with straight sides; suture well impressed and slightly crenulate. Aperture 1.37 times as long as wide, 0.50 the total height, inverse ear-shaped, the length axis slightly deviating from the shell axis. Peristome thin, pink-violet, the columellar margin broadly triangular and reflected over the narrow umbilicus, columella with a convexity at the transition to the parietal wall, parietal callus with a pink-violet hue, transparent.”

Fotos: (1) the Florida Museum of Natural History, Gainesville, EUA: HOLOTYPE de Thaumastus chalamarcaensis, UF 583750, “Chalamarca District, Centro Poblado Mayor El Verde, Cerro Sugarorco”, 2989–3052 m, V. Mogollón leg. 20.ii.2018, 47.2mm

Figura: Breure & Mogollón, 2025: (63–65) diferentes vista do HOLOTYPE; (66) escultura da protoconcha; (67) espécime vivo na localidade tipo

Fontes:

Descrição original: Breure, A. S. H. & Mogollón Ávila, V. (2025). Notes on and descriptions of Peruvian Orthalicoidea (Gastropoda, Eupulmonata). Folia Conchyliologica. 76: 7-44.
páginas(s): 29

MolluscaBase: https://molluscabase.org/aphia.php?p=taxdetails&id=1836038