Monday, August 21, 2017

[Ichthyology • 2017] Channa pseudomarulius • A Valid Species of Snakehead from the Western Ghats region of Peninsular India (Teleostei: Channidae), with Comments on Ophicephalus grandinosus, O. theophrasti and O. leucopunctatus


Channa pseudomarulius (Günther, 1861)
 subadult, 164 mm SL, Kerala, Pamba River, not preserved.


Abstract

An investigation integrating morphological and molecular data to address the taxonomic status of Indian Channa marulius-like fishes reveals the presence of two species within Indian Rivers. As a consequence, Channa pseudomarulius is resurrected as a valid species and removed from the synonymy of C. marulius. Channa pseudomarulius appears to be restricted to the southern Western Ghats region of peninsular India and can be distinguished from the more widespread C. marulius by fewer lateral-line scales, fewer dorsal- and anal-fin rays, fewer vertebrae, and by a difference of about 8% in mitochondrial cytochrome c oxidase subunit 1 gene sequences. Channa marulius and C. pseudomarulius both possess low levels of genetic diversity across their range suggestive of small historical population sizes. This is especially interesting in the case of C. marulius, which is shown to have a large natural geographical range spanning at least the Indian subcontinent and parts of the Indo-Burman ranges in westernmost Myanmar. The synonymy of Channa marulius with Ophicephalus grandinosusO. theophrasti, and O. leucopunctatus is confirmed based on examination of type specimens. A lectotype is designated for O. grandinosus.

Keywords: Pisces, CO1, DNA barcoding, Integrative taxonomy, Kerala, Morphometry


 

FIGURE 3. Channa pseudomarulius, colouration in life.
Juvenile (A), KUFOS 2017. KUT. 15, ca. 55 mm SL, Kerala, Kuttiyadi river; juvenile (B) ca. 80 mm SL, Kerala, Irrity, not preserved; subadult (C), 164 mm SL, Kerala, Pamba River, not preserved. 

FIGURE 3. Channa pseudomarulius, colouration in life.  Juvenile (A), KUFOS 2017. KUT. 15, ca. 55 mm SL, Kerala, Kuttiyadi river; juvenile (B) ca. 80 mm SL, Kerala, Irrity, not preserved; subadult (C), 164 mm SL, Kerala, Pamba River, not preserved. 

FIGURE 6. Original illustration (A) of Ophicephalus grandinosus reproduced from Cuvier & Valenciennes (1831) and lateral view (B) of lectotype (MNHN A 1959, 564 mm SL). Original illustration (C) of O. theophrasti reproduced from Jacquemont (1839) and lateral view (D) of holotype (MNHN A- 668, 330 mm SL). Reproduction of Sykes' (1841) original illustration of O. leucopunctatus (E). 



Ralf Britz, Eleanor Adamson, Rajeev Raghavan, Anvar Ali and Neelesh Dahanukar. 2017. Channa pseudomarulius, A Valid Species of Snakehead from the Western Ghats region of Peninsular India (Teleostei: Channidae), with Comments on Ophicephalus grandinosusO. theophrasti and O. leucopunctatusZootaxa. 4299(4); 529–545. DOI:  10.11646/zootaxa.4299.4.4

     

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