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Morphological and molecular characterization of selected species of Hysterothylacium (Nematoda: Raphidascarididae) from marine fish in Iraqi waters

Published online by Cambridge University Press:  02 March 2017

M. Ghadam ,
M. Banaii ,
E.T. Mohammed ,
J. Suthar  and
S. Shamsi
M. Ghadam
Affiliation:
School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, New South Wales 2678, Australia Department of Aquatic Animal Health, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
M. Banaii
Affiliation:
Marine Fisheries, Marine Science Center, University of Basrah, Iraq
E.T. Mohammed
Affiliation:
Marine Fisheries, Marine Science Center, University of Basrah, Iraq
J. Suthar
Affiliation:
School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, New South Wales 2678, Australia
S. Shamsi*
Affiliation:
School of Animal and Veterinary Sciences, Charles Sturt University, Wagga Wagga, New South Wales 2678, Australia
*
*Fax: +61 2 69334887 E-mail: [email protected]
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Abstract

Hysterothylacium species are perhaps the most abundant and diverse group of marine ascaridoids; however, their life cycle and specific identification in larval stages in many parts of the world, particularly in Iraqi marine waters, have not been completely understood. In this study three members of the genus Hysterothylacium collected from Khor Abdulla in Iraq are morphologically described, genetically characterized and their relationship with other closely related taxa are compared and discussed. A new Hysterothylacium larval type in the fourth stage of development is described, and morphological and molecular evidence (based on the sequences of internal transcribed spacers) are provided for its distinction from previously known fourth-stage Hysterothylacium larval types. Based on the sequence data it is suggested that the new larval type, which herein was assigned as Hysterothylacium larval type XVI, is H. persicum which was previously reported from the close proximity in Bandar Abbas, Iran. In addition, two other taxa, including Hysterothylacium larval type XV and H. reliquens, have been found in the present study, for which new hosts are reported. This study provides some insights into the taxonomy and systematics of these parasites, not only in this region but also for similar studies elsewhere.

Type
Research Papers
Information
Journal of Helminthology , Volume 92 , Issue 1 , January 2018 , pp. 116 - 124
Copyright
Copyright © Cambridge University Press 2017 

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