Chamalycaeus logtakensis (Godwin-Austen, 1914)

Chamalycaeus logtakensis (Godwin-Austen, 1914)

Fig. 8

Alycaeus logtakensis Godwin-Austen, 1914: 394–395 View in CoL , pl. 155 fig. 6.

Alycaeus tanghali Godwin-Austen, 1914: 401 View in CoL , pl. 137 figs 3, 3a–b. Syn. nov.

Alycaeus logtakensis View in CoL – Gude 1921: 209–210.

Alycaeus ( Alycaeus) logtakensis View in CoL – Ramakrishna et al. 2010: 48.

Dicharax (?) logtakensis View in CoL – Páll-Gergely et al. 2020: 94 View Cited Treatment .

Chamalycaeus tanghali View in CoL – Páll-Gergely et al. 2020: 46 View Cited Treatment .

Diagnosis

The low R3 without conspicuous swelling distinguishes this species from all congeners of this species group.

Type material examined

INDIA • 1 syntype of A. logtakensis ( Fig. 8A–E); on a low hill, Logtak Lake , Munipur; Godwin-Austen coll.; “figured”; NHMUK 1903.7 About NHMUK .1.2639 • 6 syntypes of A. tanghali ; Munipur; figured by Godwin-Austen; NHMUK 1903.7 About NHMUK .1.2671 ( Fig. 8F–J) .

Type localities

“Logtak Lake, Munipur (No. 2639 B.M. Coll.), on a low hill near the northern shore” ( A. logtakensis ); “Munipur. Exact locality not recorded; somewhere on the northern side of the valley” ( A. tanghali ).

Differential diagnosis

The most similar species is C. sculpturus , but that species has a less fringed aperture and a more rounded body whorl.

Remarks

There are no conchological differences between A. logtakensis and A. tanghali , and they are both from central Manipur State. Their descriptions were published in the same work but A. tanghali appeared a few pages later, therefore A. logtakensis is chosen to be the valid name. Godwin-Austen (1914) compared A. tanghali only with A. sculptilis .

Alycaeus logtakensis was included in the genus Dicharax because no spiral striation was observed on the corroded syntype ( Páll-Gergely et al. 2020). However, re-examination of the syntype of A. logtakensis revealed spiral striation on the teleoconch. Chamalycaeus tanghali was already classified in Chamalycaeus due to spiral striation on the teleoconch.