Cycloryx major ( Godwin-Austen, 1893 )

Cycloryx major ( Godwin-Austen, 1893)

Figs 26, 27F–J

Alycaeus ( Dioryx) granum var. major Godwin-Austen, 1893: 594 View in CoL .

Alycaeus ( Cycloryx) mangutensis Godwin-Austen, 1914: 377–378 View in CoL , pl. 146 figs 5, 5a.

Alycaeus ( Cycloryx) graphicus var. variabilis Godwin-Austen, 1914: 403–404 View in CoL , pl. 146 fig. 4. Syn. nov. Alycaeus ( Cycloryx) thompsoni Godwin-Austen, 1914: 404 View in CoL , pl. 146 figs 3, 3a. Syn. nov.

Alycaeus ( Cycloryx) mangutensis View in CoL – Gude 1921: 282.

Alycaeus ( Cycloryx) thompsoni View in CoL – Gude 1921: 285.

Cycloryx mangutensis View in CoL – Ramakrishna et al. 2010: 72.

Cycloryx thompsoni View in CoL – Ramakrishna et al. 2010: 74.

Pincerna major View in CoL – Páll-Gergely et al. 2020: 179 View Cited Treatment .

Pincerna graphica variabilis View in CoL – Páll-Gergely et al. 2020: 179 View Cited Treatment .

Pincerna thompsoni View in CoL – Páll-Gergely et al. 2020: 183 View Cited Treatment .

Diagnosis

This species can be recognized by the dense R1 ribbing, the regular ribbing on R3, and the angle below the umbilicus, formed by the reflected outer peristome.

Type material examined

INDIA • 8 syntypes of A. major ( Fig. 26A–E); Mangat Valley , Jiantia Hills; Godwin-Austen leg.; NHMUK 1903.7 About NHMUK .1.2518 • 17 syntypes of A. graphicus var. variabilis ( Fig. 26F–J); Lhota Naga; NHMUK 1903.7 About NHMUK .1.2607 • 1 syntype of A. thompsoni ( Fig. 26K–O); Munipur; Godwin-Austen coll.; NHMUK 1903.7 About NHMUK .1.2550 .

Additional material examined

INDIA – Mizoram • 1 empty shell ( Fig. 27F–J); Blue Mountain, Lawngtlai district ; 22.727° N, 93.135° E; 1400 m a.s.l.; 27 Jan. 2019; N.A. Aravind leg.; Ar 53; NZSI LM1716 View Materials GoogleMaps .

Type localities

“Mangut Valley, Jaintia Hills” ( A. major ); “Lhota Naga ” ( A. graphicus var. variabilis ); “Munipur” ( A. thompsoni ).

Differential diagnosis

Cycloryx graphicus has more widely-spaced ribs than C. major , and the outer peristome does not form a sharp angle below the umbilicus in that species.

Remarks

The specimen from Blue Mountain is practically identical to the type specimens of P. major in all shell characters (size, shape, rib density). Specimens labelled as “ A. graphicus var.” from the Burroi Gorge, Dafla Hills (NHMUK 1903.07.1.2598) are also identical, although most specimens are larger.

Although slightly larger, A. thompsoni and A. graphicus var. variabilis also have similar traits. Therefore, they are treated as synonyms of Cycloryx major .