Dicharax habiangensis (Godwin-Austen, 1914)

Fig. 54

Alycaeus habiangensis Godwin-Austen, 1914: 374, pl. 138 figs 2, 2a–b.

Alycaeus generosus Godwin-Austen, 1914: 374, pl. 138 figs 8, 8a–b. Syn. nov.

Alycaeus (Dicharax) habiangensis – Gude 1921: 254.

Alycaeus (Cycloryx) generosus – Gude 1921: 279.

Chamalycaeus (Dicharax) habiangensis – Ramakrishna et al. 2010: 61.

Cycloryx generosus – Ramakrishna et al. 2010: 71.

Dicharax generosus – Páll-Gergely et al. 2020: 63.

Dicharax habiangensis – Páll-Gergely et al. 2020: 63.

Type material examined

INDIA • holotype (single shell mentioned in the original description: Fig. 54A–E) of A. habiangensis; Habiang Garo, W. Khasi; Godwin-Austen leg.; NHMUK 1903.7.1.2649 • 2 syntypes of A. generosus (Fig. 54F–J); Khasi Hills, Godwin-Austen coll.; NHMUK 1903.7.1.2566 .

Type localities

“Habiang Garo, on the West Khasi border” ( A. habiangensis); “Khasi Hills” ( A. generosus).

Differential diagnosis

Both D. subculmen and D. diagonius have a longer R2, a ribbed R1, and a less bulging R3. See also under D. nitidus .

Remarks

The only difference between the two syntypes of A. generosus and the single, subadult syntype of A. habiangensis is the very slightly shallower R3 dent of the latter, suggesting that they represent the same species. The original description of A. habiangensis immediately followed that of A. generosus, and in the face of the nearly identical shells, they were not compared with each other; except for the umbilical view, they were not illustrated from the same views. We selected A. habiangensis to be the accepted name because it is known from a more precise locality than A. generosus .