Thaumastus alausiensis Cousin, 1887

Breure, Abraham S. H., 2011, Annotated type catalogue of the Orthalicoidea (Mollusca, Gastropoda) in the Royal Belgian Institute of Sciences, Brussels, with descriptions of two new species, ZooKeys 101, pp. 1-50 : 5-6

Thaumastus alausiensis Cousin, 1887 Figs 10 A–B, 10i

Thaumastus alausiensis Cousin 1887: 228, pl. 4 fig. 13.

Peronaeus (Lissoacme) alausiensis (Cousin); Breure 1975b: 1141, pl. 6 fig. 4 (lectotype designation).

Bostryx alausiensis (Cousin); Breure 2008: 244, figs 1-5.

Type locality.

[Ecuador] "sur le versant du mont Hacu, entre Achapallas et la rivière Sula, sur le territoire Alausi, province de Chimborazo".

Label.

"Racu, descente de Achupalla / au Rio Sula", in Cousin’s handwriting.

Dimensions.

"long. 25 mm; diam. 9 à 10 mm"; figured specimen H 25.2, D 11.0, W 8.2.

Type material.

RBINS/MT2333, paralectotype; MT2334, 12 paralectotypes (partly juvenile), Cousin leg. (Dautzenberg coll.).

Remarks.

The material which Breure (1975) used to select a lectotype, came from the Jousseaume collection and originated from Cousin. However, the locality was imprecise ( “Équateur” [Ecuador]). At that time, no other material from Cousin was known. In RBINS, material originating from Cousin and exactly corresponding to the type locality has been found. Therefore it may now be questioned if the Jousseaume material was validly regarded as the prime type material. However, in the inventory of Cousin’s collection, a total of 30 specimens is mentioned and it cannot be excluded that Jousseaume’s material originated from the Cousin collection.

Current systematic position.

Bulimulidae , Bostryx alausiensis (Cousin, 1887).