Taxon classification Animalia Pulmonata Plectopylidae

Endothyrella affinis (Gude, 1897) Figure 13G

Endothyrella affinis 1897b Plectopylis affinis Gude: Science Gossip, 3: 276, figs 41 a–d . ["Khasia Hills, Assam"].

Endothyrella affinis 1897g Plectopylis affinis, - Gude: The Journal of Malacology, 6: 46-48, fig. 3.

Endothyrella affinis 1899c Plectopylis (Endothyra) affinis, - Gude: Science Gossip, 6: 148.

Endothyrella affinis 1899d Plectopylis (Endothyra) affinis, - Gude: Science Gossip, 6: 175, 176.

Endothyrella affinis 1914b Plectopylis (Endothyra) affinis, - Gude: The Fauna of British India …: 73, 84-85, figs 34 a–d .

Types.

India, Khasia Hills, ex Fulton, NHMUK 1922.8.29.36 (syntype, Figure 13G); Khasia Hills, NHMUK 1901.4.25.41-43 (3 syntypes).

Additional material examined.

India, Khasi Hills, NHMUK 1892.9.22.1-4 (4 specimens); India, NHMUK 1916.3.15.1-2/2 ("showing immature armature"); Khasi Hills, Assam, coll. Salisbury ex coll. Beddome, NHMUK 20150130/3; Khasi Hills, NHMUK 20150131/3; Cherra, leg. Godwin-Austen, NHMUK 20150132/1 juvenile shell; N-Vorderindien, Khasi-Berge, coll. C. R. Boettger 1911, SMF 118096/1 (labelled as “cotype”); Cherrapoonjee, coll. Jetschin ex coll. Gude 1900, SMF 118095/2; India, Khasi Hills, NHMW 34233/2; Khasi Hills, coll. Möllendorff, SMF 150107/3; Khasi-Berge, coll. Möllendorff, ex coll. Gude, SMF 9279/4; Khasi Hills, coll. Bosch ex coll. Rolle, SMF 172074/2; N. O(?) Indien, coll. Steenberg, ZMUC-GAS-1811/1; no locality, coll. Jousseaume, MNHN 2012-27051/2; no locality, coll. Jousseaume, MNHN 2012-27048/29 (strongly shouldered, relatively small shells together with typical ones).

Diagnosis.

Shell small, sinistral, yellowish, with narrow umbilicus, conical dorsal surface and shouldered body whorl; hairs are arranged in four rows on the body whorl; callus strong, middle palatal plicae usually divided in the middle; the posterior fragments are oblique, the anterior ones are rather straight; parietal wall with a single, slightly curved lamella with short denticles posteriorly, one above and one below, and a horizontal lower plica which may be divided in the middle.

Measurements

(in mm): D: 9.7-10.9, H: 5.4-5.7 (n = 4, SMF 9279); D: 8.5-10.6, H: 5.1-5.6 (n = 3, MNHN 2012-27048).

Differential diagnosis.

See under Endothyrella plectostoma, Endothyrella sowerbyi and Endothyrella tricarinata and Table 5.

Distribution.

The species is recorded from the Khasi Hills only (Figure 11).