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Volume 27, Issue 3 – 30 September 2021

Volume 27, Issue 3 – 30 September 2021
New Scientific publication – started delivery on September 30, 2021

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Santoshkumar Abujam, Budhin Gogoi, Arup Nama Das, Debangshu Narayan Das & Shyama Prasad Biswas: Esomus nimasowi, a new species of flying barb (Cypriniformes: Danionidae) from Assam, north-eastern India, pp. 81-92


Esomus nimasowi, a new species of flying barb, is described from the Phongloso stream (a small tributary of the Kopili River) at Wasubil village in Dima Hasao district, Assam north-eastern India. The new species differs from its congeners including Esomus danrica, Esomus bengalensis and Esomus thermoicos in having a shorter maxillary barbel just reach 1/3rd of pectoral-fin length (vs. maxillary barbel very long, extending to mid of pectorals or ventral fin insertion or slightly beyond anal-fin origin); tip of pectoral fin just reach origin of pelvic fin when adpressed (vs. distinctly crossed beyond pelvic fin base). The new species can be distinguished from its congener except E. bangalensis by the absence (presence) of lateral line in E. danrica (incomplete) and in E. thermoicos (complete) and it also differs from its congeners except E. danrica in having lesser predorsal scales (15-16 vs. 17-20). Further, it differs from all congers by the unique combination of the following characters: pre-ventral length (48.6-54.6% SL), pre-anal length (70.2-75.1% SL), dorsal-fin length (21.0-23.4% SL), ventral-fin length (18.0-20.5% SL), length of ventral- fin base (3.2-4.2% SL), caudal peduncle depth (11.1-11.8% SL), pectoral fin to ventral fin distance (19.5-24.0% SL), eye diameter (24.8-29.2% SL), interorbital distance (31.7-41.6% SL), maxillary barbel (114.9-140.9% SL) and pectoral fin branched ray (i,8-9).

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Esomus nimasowi n. sp., FO69, collected at 26.763378, 90.460972. on the 13.01.2013. India. Photo by H. Bleher.


Jayasimhan Praveenraj, Tejas Thackeray, Anil Mohapatra, Annam Pavan-Kumar: Rakthamichthys mumba, a new species of Hypogean eel (Teleostei: Synbranchidae) from Mumbai, Maharashtra, India, pp. 93-102


Rakthamichthys mumba a new species of synbranchid, hypogean, eel is described from Mumbai City, Maharashtra, India, based on morphological and genetic analysis. It differs from all other species of the genus Rakthamichthys by a combination of characters viz., absence of eyes, jaws equal in forward extent, gill aperture crescentric shaped, cephalic-lateralis system distinct with prominent cephalic pores and a vertebral count of 164 (80-83 preanal + 81-84 caudal vertebrae). The new species differs from a pair-wise sequence of 21.6-22.8% in the COI gene sequence from other members of the genus Rakthamichthys.

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Rakthamichthys mumba, holotype, EBRC/ZSI/F12822, 265 mm SL. Photo by T. Thackeray.

Tyson R. Roberts: Megaleporinus prochiloides new species from Bolivia, a close relative of Prochilodus and Ichthyoelephas (Anostomidae and Prochilodontidae, Characiformes), pp. 103-112


The new species Megaleporinus prochiloides is based on an uncatalogued adult specimen from eastern Bolivia but otherwise without locality data in the teaching collection of the fish collection of the Museo de Historia Natural Noel Mercado Kempf in Santa Cruz, Bolivia (MNKP). It differs from all other species of Megaleporinus in having greatly enlarged mouth and lips strongly resembling those in Prochilodus and Ichthyoelephas. Its linearly striped coloration also occurs in all species of these genera without other distinctive coloration or marks on its head, body or fins. Juveniles are likely to have large midlateral dark spots on the posterior half of the body as in juvenile Megaleporinus macrolepidotus.

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Megalporinus prochiloides, holotype, MHNK, Bolivia, lateral view.

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Megaleporinus prochiloides new species from Bolivia, a close relative of Prochilodus and Ichthyoelephas

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Volume 27, Issue 2 – 31 May 2021

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