Symptychiella bilamellata H. Nordsieck, 2005

CLASSE: GASTROPODA: TERRESTRE

FAMÍLIA: CLAUSILIIDAE

ESPÉCIE: Symptychiella bilamellata H. Nordsieck, 2005

Tamanho médio: 13 – 16 mm

Ocorrência: Peru (San Martin)

Localidade tipo: Peru, San Martin, “path from Palestina to Cueva Huacharos de Palestina (ca. 23 km NW Rioja”

Altitude: 950 m

Nome original: Symptychiella (Symptychiella) bilamellata H. Nordsieck, 2005

Subespécies:

(1) Symptychiella bilamellata bilamellata H. Nordsieck, 2005

(2) Symptychiella bilamellata costulata H. Nordsieck, 2010

(3) Symptychiella bilamellata laevigata H. Nordsieck, 2010

(4) Symptychiella bilamellata gracilicosta H. Nordsieck, 2010

Descrição original de Symptychiella bilamellata bilamellata:

(Nordsieck, 2005): “Shell with ± attenuated apical part, whorls rounded, especially upper ones, protoconch blunt, not broader than following whorls, after first half whorl indistinctly rib-striated; yellowish-brown, in part with indistinct lighter subsutural band; teleoconch whorls densely and regularly ribbed, in part more densely on the lower whorls, riblets especially below the suture white, riblets on the neck coarser and more widely spaced, in part lengthwise white; body whorl narrowed, lamina ill-defined, neck rounded, somewhat inflated, basal keel and subsutural swelling indistinct; aperture descending, turned outward, roundish-oval to oval-piriform, yellowish-
brown inside; superior lamella of different height, short, spiral lamella rudimentary, developed as ± indistinct callosity connected with or separated from superior lamella;

inferior lamella high in position, ascending with a weak spiral, moderately high or high inwards, in front lowered on the columellar edge and ending, inner part of inferior lamella separated, but not running to the suture; subcolumellar lamella descending to the lunellar, lower end separated from lunella, in oblique view visible far inwards; lunellar dorsal-dorsolateral or dorsolateral in position, principal plica rudimentary, developed as weak plica above upper palatal plica, mostly weaker than the latter, in part indistinct;

upper palatal plica of different length, continuous with lunella by an angle, lunella hardly arcuated, in part weak or missing, posterior lower palatal plica mostly missing, if weakly developed, connected with lunella by an angle; clausilium plate in oblique view fully visible, extended into the sutural angle, in part leaving a gap at the palatal side, distally somewhat pointed, occasionally with outer corner”

Fotos:

(1-4) Forschungsinstitut und Naturmuseum Senckenberg:

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

(2) HOLOTYPE de Symptychiella bilamellata costulata, SMF 333559, “Peru, Dept. San Martin, Cueva Aguas Verdes (km 400 road Olmos-Moyobamba, right side off road) (1140 m)”, 24.i.2007, leg. Hemmen, 13.0mm

(3) HOLOTYPE de Symptychiella bilamellata laevigata, SMF 329326, “Peru, Dept. San Martin, path along river from village Aguas Claras to Cuevas de Aguas Claras (100 km NW Moyobamba) (above cave, 1020 m)”, 22.i.2007, leg. Hemmen, 14.3mm

Figura: (Nordsieck, 2010):

(21) Symptychiella bilamellata laevigata, HOLOTYPE SMF 329326, “Peru, Dept. San Martin, from Aguas Claras to Cuevas de Aguas Claras (1020 m)”, 22.i.2007, leg. Hemmen, 14.35 mm;

(22) Symptychiella bilamellata costulata, HOLOTYPE SMF 330169a, “Peru, Dept. San Martin, Cueva Aguas Verdes (1140 m)”, 24.i.2007, leg. Hemmen, 13.0 mm;

(23) Symptychiella bilamellata gracilicosta, HOLOTYPE SMF 330877, “Peru, Dept. San Martin, Cueva Huacharos de la Encanada (910 m)”, 6.x.2007, leg. Hemmen, 13.65 mm;

(24) Symptychiella fratermajor, HOLOTYPE SMF 329324, “Peru, Dept. San Martin, from Aguas Claras to Cuevas de Aguas Claras (950 m)”, 12.X.2007, leg. Hemmen, 16.2 mm;

(25) Symptychiella acuminata, HOLOTYPE SMF 330878, “Peru, Dept. San Martin, from Nueva Cajamarca to Cerro Mirador (925 m)”, 13.x.2007, leg. Hemmen, 17.4 mm

Fontes:

Descrição original: (como Symptychiella (Symptychiella) bilamellata H. Nordsieck, 2005) 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): 213, fig. 21

Nordsieck, H. (2010). New taxa of the subfamilies Neniinae and Garnieriinae (Gastropoda: Stylommatophora: Clausiliidae). Archiv für Molluskenkunde, 139 (1): 45-69, 4 pls. Frankfurt am Main.
página(s): 56, fig. 21

Senckenberg. Collection Mollusca SMF. Occurrence dataset https://doi.org/10.15468/ohuexz accessed via GBIF.org on 2025-12-13. https://www.gbif.org/occurrence/208063004

Molluscabase: https://molluscabase.org/aphia.php?p=taxdetails&id=1291697