Dicharax jaintiacus (Godwin-Austen, 1871)

Fig. 32

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

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

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

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

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

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

Alycaeus serratus – Godwin-Austen 1914: 400, pl. 144 figs 6, 6a–b. — Gude 1921: 219.

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

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

Dicharax jaintiacus – Páll-Gergely et al. 2020: 65.

Dicharax jaintiacus crassus – Páll-Gergely et al. 2020: 65.

Dicharax (?) serratus – Páll-Gergely et al. 2020: 103.

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 1903.7.1.2686 • 4 syntypes of A. jaintiacus var. crassus in 2 vials (Fig. 32K–O); Nonjinghi, Jaintia; Godwin-Austen coll.; NHMUK 1903.7.1.2752 • 1 syntype of A. serratus (Fig. 32F–J); Laisen Valley, Jiantia Hills; NHMUK 1903.7.1.2487 .

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.