Material. Antioquia, 16 km (linear distance) ENE Santa Rosa de Cabal, ca. 2500 m, in cloud forest, J. de Jager leg., 1988 (RMNH n.c); ?Antioquia/Cundinamarca,"Antiochia Bogota", W. Reiss leg., 1879 (ZMUZ 512152); Boyaca, lguaque Reserve (MEDINA & ARIAS 2007); Villa de Leiva: Canon de Mamaramo near Carrizal, entrance to Santuario de Flora y Fauna lguaque, Andean forest, 2920 m, B. Hausdorf leg., 2000 (ZMH 4224 [not seen]); Serrania de Las Quinchas, xi.2014 (FEM 155198); Caldas, near Manizales, xii.2015 (FEM 173444-173446); Cauca, Coconuco, 2000-2600 m, xii.2015 (FEM 173105-173106); Nevada del Huila, 2000-2400 m, xi.2014 (FEM 154768); Ibidem, xii.2015 (FEM 173399-173401); Sotara, Paispamba, 1700-2000 m, x.2014 (FEM 153541-153542, 153605);
Altitudinal range. All precise localities known are in the range of 1200-3000 m.
Ecology. The species occurs in Cauca Valley, Magdalena Valley and Cordillera Oriental montane forests ecoregions. From specimens at Cundinamarca locations, the habitat is fragments of primarily secondary Andean forest, ranging from the humid Bogota plateau to dryer mountainous slopes.
Remarks. After careful comparison of the material of both D. convexus and D. plicatoliratus, we fail to see substantial differences, other than in the colour pattern. Therefore, we regard the latter taxon as a junior subjective synonym of D. convexus. Given the high variation within this species, both in colouration (including predominantly axially banded, spirally banded, and unhanded specimens, sometimes in the same lot), and in shell shape (specimens with varying flaring of the peristome at the base, including rather 'spouted' shells), we feel confident that D. fresnoensis (described from a single, subadult specimen), D. tusagasuganus and D. cantatus medinanus (both based on singletons) are also junior subjective synonyms of D. convexus. D. cantatus medinanus was regarded by Pilsbry to be "very similar to the figure of D. cantatus (Rve)", probably a Peruvian species. Although the types of D. cantatus have not been found, we fail to see the similarity with Reeve's figure; the Colombian specimen has a straighter aperture which is retracted at the narrow base. The material from Tolima, Yerbabuena is only tentatively placed here; it has a more spouted aperture and may be a teratological specimen, but it is too worn to make any definite conclusions. The record from Narino, Pasto is doubtful, as the locality is far to the south from the majority of records for this species. From the Cundinamarca specimens (AI), the colouration of the live body is completely dark olive/brown, with clearly defined tubercles, and the eye stalks are the same colour even when fully extended; the end of the tail is white, from a swath of white pigmentation which starts on the sides of the end of the foot and becomes larger dorsally.