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The morphology and genetic characterization of Iheringascaris goai n. sp. (Nematoda: Raphidascarididae) from the intestine of the silver whiting and spotted catfish off the central west coast of India

Published online by Cambridge University Press:  17 August 2011

A. Malhotra*
Affiliation:
Department of Zoology, University of Allahabad, Allahabad211002, UP, India
N. Jaiswal
Affiliation:
Department of Zoology, Nehru Gram Bharati University, Allahabad, UP, India
A.K. Malakar
Affiliation:
National Bureau of Fish Genetic Resources, Canal Ring Road, PO Dilkusha, Lucknow, UP, India
M.S. Verma
Affiliation:
National Bureau of Fish Genetic Resources, Canal Ring Road, PO Dilkusha, Lucknow, UP, India
H.R. Singh
Affiliation:
College of Fisheries, G.B. Pant University of Agriculture & Technology, Pantnagar, Uttarakhand, India
W.S. Lakra
Affiliation:
National Bureau of Fish Genetic Resources, Canal Ring Road, PO Dilkusha, Lucknow, UP, India
S.K. Malhotra
Affiliation:
Department of Zoology, University of Allahabad, Allahabad211002, UP, India
S. Shamsi
Affiliation:
School of Animal and Veterinary Sciences, Charles Sturt University, Borooma St, Estella, New South Wales2678, Australia
*

Abstract

In this study a new species of nematode, Iheringascaris goai n. sp., is reported from two fish hosts, including silver whiting, Sillago sihama, and spotted catfish, Arius maculatus, caught off the Central West Coast of India at Goa. The new species can be differentiated morphologically from I. inquies, the most closely related species collected from cohabiting marine fish. The distinguishing characteristics are distinct cuticular striations, a unilateral excretory system, the presence of dentigerous ridges on the inner margin of the lips and the ratio of oesophagus to body length. In males, the ratio of spicules to body length is higher and the number of pre-anal papillae is less in comparison to those in I. inquies. In addition, the tail curves ventrad in males, while in females, the vulva is post-equatorial. The sequence alignment of 18S rDNA and cytochrome c oxidase subunit I with sequences of known species selected from the same superfamily shows a significant difference. The morphological and molecular differences reported here can, therefore, be used to assign the specimen to a new species.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2011

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