Plekocheilus (Eurytus) jimenezi ( Hidalgo, 1872 )

Borrero, Francisco J. & Breure, Abraham S. H., 2011, The Amphibulimidae (Mollusca: Gastropoda: Orthalicoidea) from Colombia and adjacent areas, Zootaxa 3054, pp. 1-59 : 43

Plekocheilus (Eurytus) jimenezi ( Hidalgo, 1872)

( Figs 15 A–B)

Bulimus jimenezi Hidalgo 1872: 93 , pl. 5 figs 2–3. Type locality: Ecuador, San José de Monti. Syntype MNCN 15.05/1066. Plekocheilus jimenezi (Hidalgo) ; Richardson 1995: 315 (references, synonymy).

Plekocheilus oligostylus Pilsbry 1939: 3 , fig. 6. Type locality: Ecuador, Prov. Napo, Nachiyacu [teste Clench & Turner 1962, see remarks below]. Lectotype ANSP 170696 ( Baker 1963).

Material. “ Colombia:” ANSP 170696 (lectotype of P. oligostylus Pilsbry ; type locality should be Ecuador, Nachiyacu , teste Clench and Turner 1962). Ecuador. Napo, near Baeza, Rio Quijos, Rio Napo Basin, ~ 1500 m, 80 km W Quito, A.M. Olalla leg.: DMNH 141635; Nachiyacu : DMNH 128642; Topo: DMNH 128688; Pastaza, Mera: DMNH 128644, USNM 598480; Puyo: DMNH 49367, DMNH 128667, USNM 598481; Prov. Pichincha: DMNH 128673. “El Oriente” [see remarks], E. Brundage (?) leg./1937: USNM 628797.

Remarks. This Ecuadorian species resembles the Colombian P. gibbonius ( Lea, 1838) but differs in that some specimens are less globose, it usually has a comparatively thinner shell, the upper part of the columella expands in P. gibbonius , and P. jimenezi has a thinner peristome. All Colombian specimens labeled as P. oligostylus proved to be misidentified, probably induced by the arguably erroneous locality of the type specimen (see also remarks under P. nachiyacu ). Available records do not suggest an overlapping distribution for these two species since P. gibbonius has not been recorded from southern Colombia. While the precise localities available for P. jimenezi do not include the most northern Ecuadorian provinces, doubt about its range remains as we have not been able to locate Hidalgo’s type locality. Further, “El Oriente” (= The East) refers to a vast region of Ecuador—mainly the “Amazonian basin”—including parts of up to six different provinces. In addition to the single recorded elevation (1500 m), the remaining localities range from ~ 600 to 2760 m. The specimen figured by Parkinson et al. (1987: pl. 14) as this species is P. gibbonius .

Figures

FIGURE 15. Plekocheilus (Eurytus). A – B. P. (E.) jimenezi (Hidalgo, 1872), lectotype of oligostylus Pilsbry, ANSP 170696 (H 71 mm). C – D. P. (E.) taylorianus (Reeve, 1848), lectotype BMNH 1874.12. 11.271 (H 57.5 mm), photo P. Crabb. E – F. P. (E.) cardinalis (Pfeiffer, 1853), lectotype ZMB 112721 (H 42 mm), photo L. Matias. G – H. P. (E.) castaneus (Pfeiffer, 1845), ANSP 78580 (H 65 mm). I – J. P. (E.) doliarius (Da Costa, 1898), lectotype BMNH 1907.11. 21.117 (H 55.5 mm), photo P. Crabb. K – M. P. (E.) lugubris (Dunker, 1882), MZSP 49310 (H 56 mm). N – O. P. (E.) incognitus spec. nov., holotype UAM (H 56 mm).