Finding Nemo! Description of a New Species of Branchial Fish Parasitic Cymothoid, Elthusa Schioedte and Meinert, 1884 (Crustacea: Isopoda), infesting Callionymus filamentosus Valenciennes, 1837 from the Northern Indian Ocean.

Autor: Aneesh PT; Blue Innovation Division, Seto Inland Sea Carbon Neutral Research Center, Graduate School of Integrated Sciences for Life, Hiroshima University, Takehara, Hiroshima, 725-0024, Japan. aneesh@hiroshima-u.ac.jp., Helna AK; Department of Aquatic Biology and Fisheries, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala, 695 581, India. helnahere@gmail.com.; Regional Forensic Science Laboratory, Govt. of Kerala, Kannur, Kerala, 670002, India. helnahere@gmail.com., Raj S; Department of Aquatic Biology and Fisheries, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala, 695 581, India.; Wildlife Information Liaison Development, 12, Thiruvannamalai Nagar, Saravanampatti-Kalapatti Road, Saravanampatti, Coimbatore, Tamil Nadu, 641035, India.; Travancore Nature History Society (TNHS), MBRRA, Mathrubhumi Road, Vanchiyoor, Trivandrum, Kerala, 695035, India., Kumar AB; Department of Aquatic Biology and Fisheries, University of Kerala, Karyavattom, Thiruvananthapuram, Kerala, 695 581, India.
Jazyk: angličtina
Zdroj: Acta parasitologica [Acta Parasitol] 2024 Mar; Vol. 69 (1), pp. 358-369. Date of Electronic Publication: 2023 Dec 16.
DOI: 10.1007/s11686-023-00745-3
Abstrakt: Purpose: Specimens of Elthusa from trashfish of the Indian SW coast were described as a new parasitic cymothoid, Elthusa nemo sp. nov., (Crustacea: Isopoda). Later, the branchial cavity of the Blotchfin dragonet Callionymus filamentosus Valenciennes, 1837 were documented as its micro- and macro-habitat (host).
Methods: Fresh/live specimens of unidentified cymothoid samples were collected from the trash fishes obtained from Neendakara (08°30.0' N 76°53.30' E) fish landing centre, Kollam district, Kerala state, southwest coast of India. After a long search for the host species, we recovered the isopod from the branchial cavity of the deep-sea fish Callionymus filamentosus Valenciennes, 1837 (Callionymiformes: Callionymidae). The new species is described and illustrated based on ovigerous females.
Results: Elthusa nemo sp. nov., has the following sets of combinations of characters: body slightly twisted, elongated, dorsal surfaces smooth, nearly twice as long as greatest width; pleon short, ~ 14% body length, 0.8 times as wide as pereon maximum width; widest at pleonite 2 and narrowest at pleonite 1; only pleonite 1, laterally overlapped by pereonite 7 posterolateral expansion and coxa 7; presence of appendix masculina on pleopod 2; uropods 0.8 times as the length of pleotelson; antenna with two plumose setae on article 4.
Conclusion: Elthusa nemo sp. nov., is the sixth species of the genus known from Indian waters.
(© 2023. The Author(s) under exclusive licence to Witold Stefański Institute of Parasitology, Polish Academy of Sciences.)
Databáze: MEDLINE