Endothyrella aborensis (Gude, 1915)

Pall-Gergely, Barna, Budha, Prem B., Naggs, Fred, Backeljau, Thierry & Asami, Takahiro, 2015, Review of the genus Endothyrella Zilch, 1960 with description of five new species (Gastropoda, Pulmonata, Plectopylidae), ZooKeys 529, pp. 1-70 : 17-19

Taxon classification Animalia Pulmonata Plectopylidae

Endothyrella aborensis (Gude, 1915) Figure 12

Endothyrella aborensis 1915 Plectopylis (Endoplon) aborensis Gude: Records of the Indian Museum, 8: 511-512, Plate 42, Fig. 3 a–d. ["Between Renging and Rotung, 2200 ft., Abor country."].

Endothyrella aborensis 2013 Endothyrella aborensis , - Páll-Gergely & Hunyadi: Archiv für Molluskenkunde, 142 (1): 5.

Types.

According to the original description, two shells, an adult and a juvenile were collected and finally deposited in the Indian Museum (inventory numbers: 5998 and 6135). Specimen reference collections in the Indian Museum were transferred to the ZSI following foundation of the ZSI in 1916. The ZSI supplied us with two photos of an adult shell under the name of Plectopylis aborensis , which they considered as one of the type specimens. These photos, however, clearly showed a different specimen than the one figured in Gude (1915). No other information could be obtained from the ZSI.

Diagnosis.

Shell small, sinistral, almost flat, widely umbilicated; callus strong; palatal plicae Z or L-shaped; there are two parietal lamellae, a short upper plica which is in contact with the posterior lamella, and a long lower plica which reaches the peristome.

Measurements

(in mm): D: 14, H: 6.5 (according to the original description).

Differential diagnosis.

The species was not examined by us, but according to the original description the species differs from all congeners by the short and uniquely shaped palatal plicae, which are depressed Z-shaped, or the lower branch of the “Z” is elongated. See also Table 5.

Distribution.

Known from the type locality only (approximately 28°10'N, 95°13'E) (Figure 10).

Remarks.

So far, this is the only Endothyrella species with two well-developed lamellae. The parietal lamellae show a very unusual arrangement which has not been ob served in any other species of Plectopylidae . The two parietal plicae can be the result of teratological duplication which has been reported for some species ( Gude 1908b: 347).