Microcotyle odacis

Microcotyle odacis is a species of monogenean, parasitic on the gills of a marine fish. It belongs to the family Microcotylidae. [1]

Microcotyle odacis
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Monogenea
Order: Mazocraeidea
Family: Microcotylidae
Genus: Microcotyle
Species:
M. odacis
Binomial name
Microcotyle odacis
Sandars, 1945 [1]
Synonyms
  • Microcotyle (Microcotyle) odacis (Sandars, 1945) Unnithan1971 [2]

Systematics

Microcotyle odacis was first described and illustrated based on 15 specimens from the gills of Odax semifasciatus (Odacidae),[1] (currently Haletta semifasciata). [3] It was placed in the nominal subgenus Microcotyle as Microcotyle (Microcotyle) odacis. [2] However, this combination was later suppressed.[4] M. odacis was redescribed and illustrated from the type-host and locality and the original figures and description of the adult morphology were completed. [5] Some minor differences in measurements and vagina were noted in the redescription. [5]

Morphology

Microcotyle odacis has the general morphology of all species of Microcotyle, with an elongated symmetrical body, comprising an anterior part which contains most organs and a posterior part called the haptor. The haptor is symmetrical, distinctly separated from the rest of the body and bears clamps, arranged as two rows, one on each side (28 on the right and 30 on the left). The clamps of the haptor attach the animal to the gill of the fish. There are also two muscular septated buccal suckers at the anterior extremity. The digestive organs include an anterior, terminal mouth, a subcircular pharynx, an oesophagus bifurcating immediately posterior to the genital atrium and a posterior intestine with two lateral branches provided with numerous secondary branches; both branches enter the haptor. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium, armed with numerous spines, a medio-dorsal vagina, a single incompletely S-shaped ovary consisting of an convoluted tube and 14 testes which are posterior to the ovary. The eggs are oval, with appendages at both poles. [1]

Hosts and localities
The type-host of Microcotyle odacis is the blue weed-whiting, Haletta semifasciata (Odacidae)

The type-host is the blue weed-whiting, Haletta semifasciata (Odacidae). The type-locality is off Australia. [1] Microcotyle odacis was reported again from the-host and locality. [5]

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References
  1. Sandars, D. F. (1945). Five new microcotylids from fish from Western Australian waters. Journal of the Royal Society of Western Australia, 29, 107-135.
  2. Unnithan, R. V. (1971). On the functional morphology of a new fauna of Monogenoidea on fishes from Trivandrum and environs. Part IV. Microcotylidae sensu stricto and its repartition into subsidiary taxa. American Midland Naturalist, 366-398.
  3. Froese, R. and D. Pauly. Editors. (2019). FishBase. Odax semifasciatus Valenciennes, 1840. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=315076 on 2019-01-26
  4. Mamaev, Y. L. (1986). The taxonomical composition of the family Microcotylidae Taschenberg, 1879 (Monogenea). Folia Parasitologica, 33, 199-206. PDF
  5. Dillon, W. A., Hargis Jr, W. J., & Harrises, A. E. (1985). Monogeneans from the southern Pacific Ocean: Polyopisthocotyleids from the Australian fishes. The subfamily Microcotylinae. Zoologicheskiy Zhurnal [1984], 63, (3), 348-359. Translation Series Number 32 of the Virginia Institute of Marine Science, The College of William and Mary, Gloucester Point, Virginia 23062, U.S.A. March, 1985 PDF of English Translation from Russian
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