Steeriana nivea H. Nordsieck, 2005

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: CLAUSILIIDAE

ESPÉCIE: Steeriana nivea H. Nordsieck, 2005

Tamanho médio: 15.4 – 18.5 mm

Ocorrência: Peru (La Libertad)

Localidade tipo: Peru, “Dept. La Libertad, ca. 25 km from Cajabamba to Huamachuco”

Altitude: 3200 m

Nome original: Steeriana nivea H. Nordsieck, 2005

Etimologia: o nome da espécie é uma referência à concha, do Latim “niveus“, nevado (=snowy)

Descrição original:

(Nordsieck, 2005): “Shell decollated, whorls less rounded; whitish-grey to grey; teleoconch whorls densely ribbed, riblets undulating, lengthwise or incompletely white, below the suture groups of stronger white riblets alternating with non-white weakly sculptured ones, on the neck, especially the dorsal keel, riblets ± coarser; neck with weak broad basal keel and ± distinct dorsal keel, mostly higher than basal keel, ± with subsutural swelling, umbilicus open; aperture protruding, roundish-oval to oval, white to yellowish-grey inside, with expanded peristome; superior lamella high, continuous with spiral lamella by a ± marked curve, in part indistinctly elongated by its side, lamellae at the connection lowered, rarely spiral lamella nearly separated or separated (approaching superior lamella from the side), spiral lamella high;

inferior lamella ascending with a weak spiral, high inwards, in part moderately high, in front lowered on the columellar edge, slightly or not thickened and ± continued to the peristome; subcolumellar lamella descending ± beyond the lunellar, in front ± strengthened, lower end separated from lunella, in oblique view visible far inwards; lunellar dorsal-dorsolateral in position, in part dorsal, principal plica ending dorsolaterally or laterally; upper palatal plica continuous with lunella mostly by a curve, lunella arcuate, posterior lower palatal plica in part shortly developed; clausilium plate in oblique view fully visible, in part leaving a gap at the palatal side, distally ± pointed and bent outward”

Fotos: (1) Forschungsinstitut und Naturmuseum Senckenberg: HOLOTYPE de Steeriana nivea, SMF 328019, Peru, “ca. 25 km from Cajabamba to Huamachuco”, 04.iv.2005, leg. Hemmen

Figura: Nordsieck, 2005:

(15) Steeriana cajamarcana pomabambensis LOOSJES & LOOSJES-VAN BEMMEL, PARATYPE, NNM 56307a, Peru, Dept. Cajamarca, Pomabamba (2150 m), 20.vii.1967, leg. Guerra, 10.85 mm;

(16) Steeriana nivea, HOLOTYPE, SMF 328019, Peru, Dept. La Libertad, ca. 25 km from Cajabamba to Huamachuco (ca. 3200 m), 4.iv.2005, leg. Hemmen, 17.45 mm;

(17) Steeriana cajamarcana solutilabrum, HOLOTYPE, SMF 156209, Peru, Dept. Cajamarca, 3 km NW Cajabamba (2800 m), leg. Weyrauch, 12.7 mm;

(18) Andiniella flammulata flammulata Loosjes, PARATYPE, SMF 156337a, Peru, Dept. Junin, Cerro Huilcashpata near Palca, Rio Tarma (3100 m), leg. Weyrauch, 11.3 mm;

(19) Andiniella flammulata unicolor, HOLOTYPE, SMF 328069, Peru, Dept. Junin, end of Palca town to Tarma (left side off road, 2000 m), 5.iv.2004, leg. Hemmen, 12.3 mm;

(20) Symptychiella annae H. Nordsieck, Peru, Dept. Amazonas, Hualamita 40 km W Rodriguez de Mendoza, I.2002, leg. Butron, 14.1 mm;

(21) Symptychiella bilamellata, HOLOTYPE, SMF 328009, Peru, Dept. San Martin, path from Palestina to Cueva Huacharos de Palestina (ca. 23 km NW Rioja), 26.iii.2005, leg. Hemmen, 14.3 mm;

(22) Symptychiella elegantissima, HOLOTYPE, SMF 328011, Peru, Dept. San Martin, path from Palestina to Cueva Huacharos de Palestina (ca. 23 km NW Rioja), 26.iii.2005, leg. Hemmen, 17.5 mm;

Fontes:

Descrição original: Neubert, E. & Nordsieck, H. (2005). New Southamerican Clausiliidae from the collections of the Florida Museum of Natural History (Gastropoda, Clausiliidae, Neniinae). Bulletin of the Florida Museum of Natural History, 45 (2): 45-62. Gainesville.
página(s): 48, Fig. 2

Nordsieck, H. (2005). Revision of the system of the Peruvian Neniinae (Gastropoda: Stylommatophora: Clausiliidae), with description of new taxa. Archiv für Molluskenkunde. 134 (2): 197-221, 3 pls. Frankfurt am Main.
página(s): 207, fig. 6

Nordsieck, H. (2007). Worldwide Door Snails (Clausiliidae), Recent and Fossil. ConchBooks, Hackenheim, 214 pp.
página(s): 39

Molluscabase: https://molluscabase.org/aphia.php?p=taxdetails&id=1291701