Dicharax jaintiacus ( Godwin-Austen, 1871 )

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

Fig. 32

Alycaeus Jaintiacus Godwin-Austen, 1871: 92–93 View in CoL , pl. 5 fig. 3.

Alycaeus serratus Godwin-Austen, 1874: 148–149 View in CoL , pl. 3 fig. 6. Syn. nov.

Alycaeus jaintiacus var. crassus Godwin-Austen, 1914: 375 View in CoL , pl. 137 figs 5, 5a. Syn. nov.

Alycaeus ( Alycaeus) serratus View in CoL – Kobelt 1902: 351. — Ramakrishna et al. 2010: 51.

Alycaeus ( Dicharax) jaintiacus View in CoL – Kobelt 1902: 372. — Gude 1921: 256.

Alycaeus jaintiacus View in CoL – Godwin-Austen 1914: 375, pl. 143 figs 3, 3a–b.

Alycaeus serratus View in CoL – Godwin-Austen 1914: 400, pl. 144 figs 6, 6a–b. — Gude 1921: 219. Chamalycaeus ( Dicharax) jaintiacus View in CoL – Ramakrishna et al. 2010: 61.

Alycaeus ( Dicharax) jaintiacus var. crassa – Gude 1921: 256–257.

Dicharax jaintiacus View in CoL – Páll-Gergely et al. 2020: 65 View Cited Treatment .

Dicharax jaintiacus crassus View in CoL – Páll-Gergely et al. 2020: 65 View Cited Treatment .

Dicharax (?) serratus View in CoL – Páll-Gergely et al. 2020: 103 View Cited Treatment .

Diagnosis

The elevated spire, rather smooth R1 (with the exception of strong, widely-spaced ribs along the suture), the long R3 swelling with straight anterior part, and the strongly fringed aperture distinguish this species from its congeners.

Type material examined

INDIA • 14 syntypes of A. jaintiacus ( Fig. 32A–E); Nongjinghi, Jaintia Hills; Godwin-Austen leg.; NHMUK 1903.7 About NHMUK .1.2686 • 4 syntypes of A. jaintiacus var. crassus in 2 vials ( Fig. 32K–O); Nonjinghi, Jaintia; Godwin-Austen coll.; NHMUK 1903.7 About NHMUK .1.2752 • 1 syntype of A. serratus ( Fig. 32F–J); Laisen Valley , Jiantia Hills; NHMUK 1903.7 About NHMUK .1.2487 .

Type localities

“in Nongjinghi, Jaintia” ( A. jaintiacus ); “in Nongjinghi, Jaintia, 4563 feet ” ( A. jaintiacus var. crassus ); “Laisen Trigl. station, Munipur Hills” ( A. serratus ).

Differential diagnosis

The most similar is D. obscurus ; for comparisons, see under that species. Species of the Dicharax species group 7 ( D. chennelli and similar species) resemble D. jaintiacus , but the distance between their two peristomes is smaller, their R3 swelling is more inflated and usually have R3 depressions. In contrast, D. jaintiacus has a less inflated R3 without depressions.

Remarks

Dicharax jaintiacus var. crassus is practically identical to the nominotypical form, therefore it is treated here as a junior synonym. Alycaeus serratus is slightly smaller and has a shallower R3 swelling, but all other shell characters are very similar, and they were described from the same geographic region; therefore, Alycaeus serratus is hereby synonymised with D. jaintiacus . Alycaeus serratus was not compared with A. jaintiacus in its original description.