Porphyrobaphe (Porphyrobaphe) iostoma (Sowerby I, 1824)

Breure, Abraham S. H. & Avila, Valentin Mogollon, 2016, Synopsis of Central Andean Orthalicoid land snails (Gastropoda, Stylommatophora), excluding Bulimulidae, ZooKeys 588, pp. 1-199 : 55

Taxon classification Animalia Stylommatophora Orthalicidae

Porphyrobaphe (Porphyrobaphe) iostoma (Sowerby I, 1824) Figs 55 D–F, 56, 84C, 86 A–C

Bulimus iostoma Sowerby I 1824: 58, pl. 5 fig. 1.

Bulimus grevillei Pfeiffer 1875 [1870-1876]: 143, pl. 133 figs 4-5.

Porphyrobaphe iostomus ; Richardson 1993: 118 (references, synonymy); Ramírez et al. 2003: 282.

Porphyrobaphe (Porphyrobaphe) iostoma ; Breure and Borrero 2008: 28.

Type locality.

No type locality given.

Type material.

Not located.

Diagnosis.

Shell with a colour pattern of irregularly spaced spots, partly forming longitudinal streaks, especially on upper whorls, aperture broadly ovate, peristome thick, typically purple but may be whitish, expanded and reflexed.

Dimensions.

Shell height 60.3, diameter 31.7 mm.

Distribution.

Colombia ( Linares and Vera 2012). Ecuador, Prov. El Oro, near Machala; ibid., Chacras; ibid., Santa Rosa; Prov. Esmeraldas, various localities; Prov. Guayas, 5 km N Santa Elena ( Breure and Borrero 2008); Prov. Manabí, Jama (NHMUK 20150529). Peru, Dept. Piura, La Laja ( Schileyko 1999); Dept. Tumbes, Lechugal (Sztolcman leg., Pilsbry 1899: 151); ibid., Matapalo (USNM 666039*).

Ecoregion.

Western Ecuador moist forests [NT0178], Ecuadorian dry forests [NT0214], Tumbes-Piura dry forests [NT0232], South American Pacific mangroves [NT1405].

Remarks.

This is a very characteristic species which can hardly be mistaken. However, the record for Colombia from Linares and Vera (2012), based on unverified material, needs confirmation. The colour pattern may be faded away in living specimens (Fig. 86 A–C).