First Record of Flesh-burrowing, Fish Parasitic Isopod Genus Ichthyoxenos Herklots, 1870 (Isopoda: Cymothoidae) from India with Morphological Description of a New Species

Santanu Mitra *

Crustacea Division, Zoological Survey of India, Fire Proof Spirit Building, 27 Jawaharlal Nehru Road, Kolkata-700016, West Bengal, India.

Parimita Chowdhury

Crustacea Division, Zoological Survey of India, Fire Proof Spirit Building, 27 Jawaharlal Nehru Road, Kolkata-700016, West Bengal, India.

*Author to whom correspondence should be addressed.


Abstract

A new species of parasitic Isopod of the genus Ichthyoxenos Herklots, 1870, is described here based on six specimens collected from the oxbow lake at Purbashtali, of East Burdwan District of West Bengal, India. This cymothoid genus is recorded for the first time from India.  The new species, Ichthyoxenos aneeshi sp. nov., can be easily separated from its congeners by its distinguishing morphological characters i.e., rounded body structure; semicircular head; eyes rectangular; pereonite 1 lateral margin straight; mandible broad, molar process covered in pectinate scales, maxilla 1 with 3 setae, maxilla 2 with three segments, maxilliped comprises 4 articles; antennules shorter than antenna, comprises 7 articles, reaches only middle of the eye; antenna hardly reaches up to the distal margin of pereonite 1; antennae comprises 9 articles, terminal article without setae; pereonite 3-7 posterior margin concave; pereonite 4 widest, pereonite 7 shortest; pleotelson 0.8 times as long as maximum width, free edge straight to gently convex, median part slightly concave, longitudinal dorso-median ridge prominent; uropodal endopod and exopods without serration, subequal. Detailed morphological description along with a comparison with nearest congeners is provided in this paper; short ecological observations are also incorporated here.  This is the 24th species of the genus Ichthyoxenos, Herklots, 1870.

Keywords: Crustacea, West Bengal, cymothoidae, new species, taxonomy


How to Cite

Mitra , S., & Chowdhury , P. (2024). First Record of Flesh-burrowing, Fish Parasitic Isopod Genus Ichthyoxenos Herklots, 1870 (Isopoda: Cymothoidae) from India with Morphological Description of a New Species. UTTAR PRADESH JOURNAL OF ZOOLOGY, 45(11), 136–147. https://doi.org/10.56557/upjoz/2024/v45i114080

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References

Bruce NL. The genera Catoessa, Elyhusa, Enispa, Ichthyoxenus, Idusa, Livoneca and Norileca n. gen. (Isopoda: Cymothoidae), crustacean parasites of marine fishes; with descriptions of eastern Australian Species. Records of the Australian Museum. 1990; 42(3):247-300.

Martin MB, Bruce NL, Nowak BF. Redescription of Ichthyoxenus puhi (Bowman, 1962) (Isopoda, Cymothoidae), parasite of the moray eel, Gymnothorax griseus (Lacepede, 1803) from Mauritius. Crustaceana. 2014;87(6):654-665. DOI: 10.1163/15685403-00003315

Aneesh PT, Hadfield KA, Smit NJ, Bijukumar A. A new genus and species of fish parasitic cymothoid isopod (Crustacea) from Indian waters, with a key to the branchial-attaching cymothoid genera. Marine Biology Research; 2020. 1-20. DOI: 10.1080/17451000.2020.1851032

Ravichandran S. Infestation of isopod parasite Lironeca puhi in slender needle fish Strongylura leiura. Research Journal in Parasitology. 2007; 2, 87–93. DOI: 10.3923/jp.2007.87.93.

Ravichandran S, Vigneswaran P, Rameshkumar G. A taxonomic review of the fish parasitic isopod family Cymothoidae Leach, 1818 (Crustacea: Isopoda: Cymothoidea) of India. Zootaxa. 2019;4622(1):99. DOI. org/ 10.11646/ zootaxa.4622.1.1

Aneesh PT, Helna AK, Raj S, Kumar AB. Description of Elthusa aquabio sp. n. (Crustacea: Isopoda: Cymothoidae), a branchial fish parasitic isopod from Indian waters. Journal of Natural History. 2023; 57(21-24):1193-1205. Available:https://doi.org/10.1080/00222933.2023.2242099

Schioedte JC, Meinert F. Symbolaead Monographiam Cymothoram Isopodum Crustaceorum familiae IV. Cymothoidae. Trib. II. Cymothoinae. Trib. III. Livonecinae. Naturhistorisk Tidsskrift. 1884;14(3):221-.454.

Tsai ML, Dai CF. Ichthyoxenus fushanensis, new species (Isopoda: Cymothoidae), parasite of the fresh-water fish, Varicorhinus barbatulus, from northern Taiwan. Journal of Crustacean Biology. 1999;19(4):917-923.

Harada I. Studies on the freshwater fauna of Formosa. Ill. Note on a new Ichthyexonus parasitic on Carassius duratus L. Journal of the Society of Tropical Agriculture, Taiwan. 1930;2:264-269.

Brusca RC. A monograph on the isopoda Cymothoidae (Crustacea) of the eastern pacific. Zoological Journal of the Linean Society. 1981;73:117-199.

Yamano H, Yamaguchi T, Hosoya K. A new host record of Ichthyoxenus amurensis (Crustacea: Isopoda: Cymothoidae) from the Amur bitterling Rhodeus sericeus (Cypriniformes: Cyprinidae), Limnology. 2011;12: 103-106.

Chang Y, Lin Y, Chuang L. Notes on a new host of Icthyoxenus fushaensis; an endemic species of freshwater fish, candidia barbatus, in Taiwan. Tawiania. 2006;51(1):68-70.

Herklots JA. Deux nouveaux genres de Crustaces vivant en parasites sur des poisons-epicththys et icthyoxenos. Archives Neerlandaises des Sciences exactes et naturelles. 1870;5:120-137.

Yii SC. Notes on the Chinese Ichthyoxenus (Parasitic Isopoda) with the description of a new species. Bulletin of the Fan Memorial Institute of Biology (Zoology). 1935;6:71-80.

Richardson H. The isopod genus Ichthyoxenus Herklots, with description of a new species from Japan. Proceedings of the United States National Museum. 1913; 45:559-562.

Ahmed MM. New Isopoda (Flabellifera) from Iraq and Arabian Gulf III. Ichthyoxenus asymmetrica sp. nov. Bulletin of the Iraqi Natural History Museum. 1970;4:33-36.