Pseudaxine

File:Parasite200077-fig4 - Pseudaxine trachuri - drawings of clamps.png]]

Species of Pseudaxine are ectoparasites that affect their host by attaching themselves as larvae on the gills of the fish and grow into adult stage. This larval stage is called oncomiracidium, and is characterized as free swimming and ciliated. The clamps are distributed along one margin of the haptor.{{cn|date=November 2019}} Pseudaxine resemble Axine in having a single row of 20 – 30 clamps on one side of the body. However, it differs from Axine in having their hooks situated at the posterior end of the clamp row.Kearn, G.C., 2005. Leeches, Lice and Lampreys: A Natural History of Skin and Gill Parasites. Springer, Dordrecht, The Netherlands. Pseudaxine also resembles Gastrocotyle in having a single row of clamps on one side, however, in Pseudaxine the haptor is oblique, while in Gastrocotyle the haptor is parallel to the body-axis, and extends to the ovarian zone.{{cite journal|last1=Unnithan|first1=R. Viswanathan|title=On the functional morphology of a new fauna of Monogenoidea on fishes from Trivandrum and environs Part II. Opisthogynidae fam.nov. (Gastrocotyloidea) and Abortipedinae subfam.nov. (Protomicrocotyloidea)|journal=Parasitology|volume=52|issue=3–4|year=2009|pages=315–351|issn=0031-1820|doi=10.1017/S0031182000027190}}

Pseudaxine was established to accommodate Pseudaxine trachuri from the gills of the Atlantic horse mackerel Trachurus trachurus (referred to as Caranx trachurus in the original description), designated as the type species of the genus. It was placed in the Microcotylinae,Palombi, A. (1949). I. Trematodi d'Italia: parte I. Trematodi Monogenetici. Rosenberg.Tripathi, Y. R. (1956). Studies on the parasites of Indian fishes. IV. Trematoda: Monogenea, Microcotylidae. Records of the Indian Museum, 52(2/4), 231-247 in Gastrocotylinae Sproston, N. G. (1946). A synopsis of the monogenetic trematodes. The Transactions of the Zoological Society of London, 25(4), 185-600. then in Arreptocotylidae. Currently, it is included in the Gastrocotylidae.{{cite journal|last1=Hargis|first1=William J.|title=Monogenetic Trematodes of Gulf of Mexico Fishes. Part XIII. The family Gastrocotylidae Price, 1943 (Continued)|journal=Transactions of the American Microscopical Society|volume=76|issue=1|year=1957|pages=1–12|issn=0003-0023|doi=10.2307/3223916|jstor=3223916 }}

Nine species have been described in Pseudaxine:

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• Pseudaxine trachuri Parona & Perugia, 1890
• Pseudaxine vagans Ishii, 1936Ishii, N. (1936). Some new ectoparasitic trematodes of marine fishes. Dobutsugaku Zasshi= Zoological Magazine, 48(8/10), 781-790. (In Japanese). currently included in Allopseudaxine Yamaguti, 1943 Price, E.W. (1962b) Redescription of two exotic species of Monogenetic trematodes and the proposal of a new family. Proceedings Of The Biological Society Of Washington, 75, 295-302. [https://www.biodiversitylibrary.org/page/34571769.pdf PDF] {{open access}}
• Pseudaxine katsuwonis Ishii, 1936 currently included in Allopseudaxinoides Yamaguti, 1965
• Pseudaxine mexicana Meserve, 1938Meserve, F.G. (1938) Some monogenetic Trematodes from the Galapagos Islands and the Neighboring Pacific. Allan Hancock Pacific Expeditions, 2, 31-72. [https://www.biodiversitylibrary.org/page/4164212.pdf PDF] {{open access}} currently included in Mexicotyle Lebedev, 1984
• Pseudaxine indicana Chauhan, 1945 Chauhan, B.S. (1945) Trematodes from Indian Marine fishes Part I. On Some New Monogenetic Trematodes of the Sub-orders Monopisthocotylea Odhner, 1912 and Polyopisthocotylea Odhner, 1912. Indian Acad.Sci.SectionB, 21, 129-159.
• Pseudaxine texana Koratha, 1955 currently considered a junior synonyme of Pseudaxine mexicana Hargis, W. J. JR. 1956b. Monogenetic trematodes of Gulf of Mexico fishes. Part;XII. The family Gastroeotylidae Price, 1943. Bull. Mar. Sci. Gulf and

Caribbean 6: 28-43.

• Pseudaxine bivaginalis Dillon & Hargis, 1965 {{cite book|last1=Dillon|first1=William Arthur|last2=Hargis|first2=William J.|title=Biology of the Antarctic Seas II |chapter=Monogenetic Trematodes from the Southern Pacific Ocean: 2. Polyopisthocotyleids from New Zealand Fishes: The Families Discocotylidae, Microcotylidae, Axinidae, and Gastrocotylidae|series=Antarctic Research Series |year=1965|pages=251–280|issn=2328-9201|doi=10.1029/AR005p0251|isbn=9781118668627 }}
• Pseudaxine triangula Mamaev, 1967 Mamaev, Yu.L. (1967) Pseudaxine triangula sp. n. and Metapseudaxine ventrosicula gen. & sp. n. and their position in

the system of Monogenoidea. Zoologicheskii Zhurnal, 46,

993–998. (In Russian). currently included in Churavera Unnithan, 1968Lebedev, B. I. (1984) System of Monogenea of the suborder Gastrocotylinea. Vladivostok: Academy of Sciences of the USSR, 1–15 pp. (In Russian.)

• Pseudaxine decapteri Yamaguti, 1968 Yamaguti S. 1968: Monogenetic Trematodes of Hawaiian

Fishes. University of Hawaii Press, Honolulu, 287 pp. currently included in Pseudaxinoides Lebedev, 1968 Lebedev, B.I. (1977) Two new species of monogeneans from fishes of Indo-Pacific waters wilh notes concerning the genera Pseudaxine and Pseudaxinoides. Excerta parasitologica en memoria del Dr.Eduardo Caballero y Cabellero., 4, 69-78.

• Pseudaxine kurra Unnithan, 1968 Unnithan, R.V. (1968) on six species of Monogenetic trematodes, parasitic on the gills of marine fishes from the Indian seas. Treubia, 27, 141-164. [http://e-journal.biologi.lipi.go.id/index.php/treubia/article/download/1557/1448.pdf PDF] {{open access}}

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Category:Gastrocotylidae

Category:Monogenea genera

Category:Parasites of fish