Dicharax khasiacus ( Godwin-Austen, 1871 )

Dicharax khasiacus ( Godwin-Austen, 1871) View in CoL

Fig. 68

Alycaeus Khasiacus Godwin-Austen, 1871: 90 View in CoL , pl. 3 fig. 4.

Alycaeus duorugosus Godwin-Austen, 1914: 391 View in CoL . Syn. nov.

Alycaeus khasiacus View in CoL – Sowerby 1877: pl. 1, species 8. — Godwin-Austen 1914: 356, 376–377, 393, pl. 143 figs 7, 7a–b.

Alycaeus ( Dicharax) khasiacus View in CoL – Kobelt 1902: 372–373. — Gude 1921: 257–258.

Alycaeus khasiacus View in CoL var. – Godwin-Austen 1914: 356.

Alycaeus ( Dicharax) duorugosus View in CoL – Gude 1921: 249.

Chamalycaeus ( Dicharax) duorugosus View in CoL – Ramakrishna et al. 2010: 59.

Chamalycaeus ( Dicharax) khasiacus View in CoL – Ramakrishna et al. 2010: 62.

Dicharax (?) khasiacus View in CoL – Páll-Gergely et al. 2020: 90 View Cited Treatment .

Dicharax (?) duorugosus View in CoL – Páll-Gergely et al. 2020: 86 View Cited Treatment .

Diagnosis

Dicharax khasiacus is characterized by the rounded outline, the short, smooth R2, and the two, anteriorly situated R3 swellings.

Type material examined

INDIA • 29 syntypes of A. khasiacus ( Fig. 68A–E); Lailangkote, Khasi Hills; NHMUK 1903.7 About NHMUK .1.2650 • 1 syntype of A. duorugosus ( Fig. 68F–J); Burrail; Godwin-Austen coll.; NHMUK 1903.7 About NHMUK .1.2771 .

Additional material examined

INDIA • 4 shells; Jawai , Assam; Oberwimmer coll.; NHMW • 2 shells; same data as for preceding; NHMW 14711 View Materials • 4 shells; Jawai, India; Dr. Leo P. Rušnov coll., ex coll. Dr W. Blume ex coll. W.F. Webb; NHMW 15168 View Materials .

Type localities

“On the highest parts of the Khasi and Jiantia Hills” ( A. khasiacus ); “Burrail Range, Naga ” “Also Angaoluo Trigonometrical Station, No. 2572; South Barak, No. 2629, and Munipur, No. 2654 B.M.” ( A. duorugosus ).

Differential diagnosis

Dicharax lahupaensis has a ribbed R2 (smooth in D. khasiacus ) and a thicker peristome. Dicharax akhaensis is larger, has a shorter R3 swelling, and a less fringed aperture.

Remarks

The single examined syntype of A. duorugosus fits the morphological variability of the 29 syntypes of A. khasiacus ; therefore the former is a junior synonym of the latter.