Editorial Type:
Article Category: Research Article
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Online Publication Date: 09 Oct 2020

A New Sisorid Catfish of the Genus Exostoma Blyth from the Chindwin-Irrawaddy Drainage in Northeastern India (Teleostei: Siluriformes)

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Page Range: 545 – 550
DOI: 10.1643/CI-19-248
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A new species of glyptosternine catfish of the genus Exostoma is described from the Chakpi River, a tributary of the Chindwin-Irrawaddy drainage in northeastern India. The new species can be distinguished from congeners of the Chindwin-Irrawaddy drainage except E. chaudhurii and E. vinciguerrae in having an adipose fin confluent (vs. separate) with the upper procurrent caudal-fin rays. It differs from E. chaudhurii in having anastomosing, rounded (vs. parallel) striae on the anterolateral surfaces of the lips and from E. vinciguerrae in having shorter adipose-fin base (29.1–32.3% SL vs. 35.4–39.4). This is the sixth species of Exostoma known from the Chindwin-Irrawaddy drainage.

Copyright: © 2020 by the American Society of Ichthyologists and Herpetologists
Fig. 1.
Fig. 1.

Exostoma dujangensis, holotype, ZSI FF 8152, 72.0 mm SL. Dorsal, lateral, and ventral views.

Fig. 2.
Fig. 2.

Exostoma dujangensis, holotype, ZSI FF 8152, 72.0 mm SL. Dorsal and ventral views of head.

Fig. 3.
Fig. 3.

Map showing type locality of Exostoma dujangensis.

Fig. 4.
Fig. 4.

Dujang stream, type locality of Exostoma dujangensis.

Fig. 5.
Fig. 5.

Ventral views of mouths showing striae on the anterolateral surfaces of the lips: (A) Exostoma dujangensis, holotype, ZSI FF 8152, 72.0 mm SL; (B) E. chaudhurii, ZSI F 9741/1, 53.0 mm SL.

Contributor Notes

1 Zoological Survey of India, Freshwater Fish Section, 27 J.L. Nehru Road, Kolkata, India; Email: (BS) bdshangningam@gmail.com; and (LK) lkzsi5@yahoo.com. Send reprint requests to BS.
Received: 06 Jun 2019
Accepted: 24 Apr 2020
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