Microcotyle arripis

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

Microcotyle arripis
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Monogenea
Order: Mazocraeidea
Family: Microcotylidae
Genus: Microcotyle
Species:
M. arripis
Binomial name
Microcotyle arripis
Sandars, 1945

Systematics

Microcotyle arripis was first described by Sandars in 1945 based on 51 specimens from the gills of the Australian herring Arripis georgianus (Arripidae) off Western Australia.[1] It was redescribed and illustrated from the type host and locality,.[2][3][4] All authors noted minor differences in their redescriptions.[2][3][4]

A sequence of the species' 28S rRNA gene has been published.[4]

Description

Microcotyle arripis has the general morphology of all species of Microcotyle, with a symmetrical elongated body tapered posteriorly and anteriorly, comprising an anterior part which contains most organs and a posterior part called the haptor. The haptor is symmetrical, not well delimited from body proper and bears 35 pairs of clamps, arranged as two rows, one on each side. The clamps of the haptor attach the animal to the gill of the fish. There are also two buccal suckers at the anterior extremity. The digestive organs include an anterior, terminal mouth, a circular muscular pharynx situated very close to the oral suckers, an oesophagus bifurcating a little distance behind the genital atrium and a posterior intestine with two lateral branches that penetrates the haptor and are provided with numerous secondary branches. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium opening a little distance behind the pharynx, armed with numerous conical spines, a medio-dorsal vagina, a single S-shaped ovary and 23 testes posterior to the ovary, of irregular shape and fit closely against one another.[1]

Diagnosis

According to Sandars (1945), Microcotyle arripis most closely resembles Microcotyle caudata, Microcotyle truncata, Microcotyle fusiformis, and Microcotyle sebastis. It can be distinguished from these species by different measurements.[1]

Hosts and localities
The type-host of Microcotyle arripis is the Australian herring Arripis georgianus

The type-host is the Australian herring Arripis georgianus (Arripidae). The type-locality is off Western Australia.[1] There are other records.[2][3][4]

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. PDF at BHL
  2. 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
  3. Williams, Alan (1991). "Monogeneans of the families Microcotylidae Taschenberg, 1879 and Heteraxinidae Price, 1962 from Western Australia, including the description of Polylabris sandarsae n. sp. (Microcotylidae)". Systematic Parasitology. 18 (1): 17–43. doi:10.1007/BF00012221. ISSN 0165-5752.
  4. Catalano, Sarah R.; Hutson, Kate S.; Ratcliff, Rodney M.; Whittington, Ian D. (2010). "Redescriptions of two species of microcotylid monogeneans from three arripid hosts in southern Australian waters". Systematic Parasitology. 76 (3): 211–222. doi:10.1007/s11230-010-9247-x. ISSN 0165-5752.
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