Plekocheilus (Eurytus) oligostylus Pilsbry, 1939

Breure, Abraham S. H. & Avila, Valentin Mogollon, 2016, Synopsis of Central Andean Orthalicoid land snails (Gastropoda, Stylommatophora), excluding Bulimulidae, ZooKeys 588, pp. 1-199: 14

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Plekocheilus (Eurytus) oligostylus Pilsbry, 1939


Taxon classification Animalia Stylommatophora Amphibulimidae

Plekocheilus (Eurytus) oligostylus Pilsbry, 1939  Figs 10 A–B, 14

Plekocheilus oligostylus  Pilsbry 1939: 3, fig. 6.

Plekocheilus jimenezi  ; Richardson 1995: 315 (references, excl. synonymy).

Plekocheilus (Eurytus) jimenezi oligostylus  ; Breure and Borrero 2008: 6.

Type locality.

“Colombia”, see remarks.

Type material.

ANSP 170696, lectotype (Baker, 1963).


Shell relatively large, solid, with oblique series of more or less spirally arranged reddish-brown spots, evenly and dense granulation, suture somewhat descending in front, aperture ovate.


Shell height 71.0, diameter 47.0 mm.


Ecuador, Prov. Napo, Nachiyacu; ibid., Sarayacu; ibid., valley Río Quijos; Prov. Pastaza, Puyo; ibid., Mera (all Breure and Borrero 2008).


Eastern Cordillera real montane forests [NT0121].


Clench and Turner (1962: 109) have pointed out that the original locality was erroneous; the type locality should be Nachiyacu. This taxon has been synonymized by Richardson (1995) with Plekocheilus (Eurytus) jimenezi  , but without any comments. The shape of the aperture in the type specimen may not be entirely typical; it does not show the ascending suture behind the lip typical of Plekocheilus (Eurytus) jimenezi  , and the aperture is different in shape. Tentatively we have retained this taxon as a separate species, as it may be sympatric with Plekocheilus (Eurytus) jimenezi  , awaiting further studies in the area.