Plekocheilus (Eurytus) castaneus (Pfeiffer, 1845)

Borrero, Francisco J. & Breure, Abraham S. H., 2011, The Amphibulimidae (Mollusca: Gastropoda: Orthalicoidea) from Colombia and adjacent areas, Zootaxa 3054, pp. 1-59 : 45

Plekocheilus (Eurytus) castaneus (Pfeiffer, 1845)

( Figs 14 A, 15G–H)

Bulimus castaneus Pfeiffer 1845: 68 . Colombia, “Vegas of the River Quenden.” Lectotype BMNH 1975279 ( Breure 1978). Plekocheilus castaneus (Pfeiffer) ; Richardson 1995: 306 (references).

Material. Antioquia, La Ceja: DMNH 128687, USNM 517845 (SE Medellín, Daniel leg.), ANSP 166986 (leg./ 1935); Alto de San Miguel, [Municipio de] Caldas: UAM (2045 m, M.I. Gómez leg.), UAM (A. Sierra leg./1997); Caldas, Pensilvania: DMNH 137442, RMNH, UVZ 83012; Cauca, “Cauca:” ANSP 78580, ANSP 91221 (Bonis leg.), RMNH, UMMZ 147705 (ex Fulton); “Cauca Depto.:” UF 206151 [not seen]; “Cauco” [= Cauca]: DMNH 76768; Headwaters of Rio Palo, Central Cordillera, 2900 m, Pittier leg./1906: USNM 251158; Cundinamarca, Bogotá: ZMUZ 511587, ZMUZ 511589 [both not seen]); Guayabetal, on road between Bogotá and Villavicencio: RMNH; Huila, La Plata, Reserva Forestal Meremberg, ~ 2300 m: UVZ 82258 (E. Buttkus leg./1982), UVZ 82300 (Kattan leg./1982), UVZ 83002 (Kattan leg./1983); Nariño, El Palusar [sic, probably El Palmar], 1300 m: NRS 2754, NRS 2755 (both as P. coloratus ); Quindío?, “Vegas of the River Quenden:” BMNH; Risaralda, Santuario de Fauna y Flora Otún-Quimbaya, Corregimiento La Florida, 1850–2250 m: GK; Tolima, “Fresno, near Santa Ana,” Bland leg.: ANSP 66412; “Upper Magdalena Valley” ( Pilsbry 1895 [ 1895 –1896]: 86); El Espinal: DMNH 137440; Toche, ca. 55 km NW Ibagué, 2500 m: NRS 2752 (as P. coloratus ); Valle del Cauca, Hacienda Santelina, Vereda Janeiro, Corregimiento La Magdalena, Buga, 2100 m, V. Rojas leg./1999: UVZ 99100; Buga, road Buga–El Crisol, watershed Rio Guadalajara, 1800–2200 m, I. Cabrera leg./1985: UVZ 85010; Finca El Manzano (Betania), Mpio. Bolívar, 1700 m, Velasco & J.H. Restrepo leg./1984: UVZ 84008; Hacienda Cristales, Municipio Sevilla, road Barragán–Sevilla, 2100 m, Rojas leg./1999: UVZ 99108; Vereda La Débora, 20 km above Trujillo and 4.8 km above Venecia, 2050 m, P. Silverstone leg./1982: UVZ 82048; Cerro El Inglés, El Cairo, Vereda Las Amarillas: UVZ 97020 (2160 m, W. Bolívar leg./1997), UVZ sn13 (2000 m, Rojas leg.); Serranía de Los Paraguas , Alto de Galápagos, C. Murcia leg./1994: UVZ 97016.?, “Andes U.S. Colombia,” ex Redfield Colln: USNM 307389. “ New Granada,” MacAndrew Colln.: BMNH,

Altitudinal range. The localities indicated comprise a range of 1300–2900 m.

Remarks. The type locality is near Fresno, where a “Santa Ana” is located at 05°07’33”N 74°57’09”W. This species is similar to P. gibbonius , particularly when subadult specimens are examined. P. castaneus can be distinguished in having a generally thinner shell, a more oval aperture, and a much weaker columellar fold. In addition, P. castaneus almost always has brown/maroon interior and edges of the peristome, whereas P. gibbonius frequently (but not always) has lighter coloration in both areas. There is partial overlap in the distribution of these species, particularly in central Colombia; however, the records available suggest that P. gibbonius extends further north (i.e., Boyacá, Santander, Magdalena), whereas P. castaneus extends further south (Cauca, Huila).

Figures

FIGURE 14. Plekocheilus distribution. A. P. (Eurytus) gibbonius, P. (E.) cardinalis and P. (E.) castaneus. B. P. (E.) pulicarius, P. (E.) semperi, P. (E.) tetensii and P. (E.) lugubris. C. P. (E.) lynciculus. D. P. (E.) caramitagua. E. P. (Eudolichotis) distortus.