Microcotyle nemadactylus

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

Microcotyle nemadactylus
Scientific classification
Kingdom: Animalia
Phylum: Platyhelminthes
Class: Monogenea
Order: Mazocraeidea
Family: Microcotylidae
Genus: Microcotyle
Species:
M. nemadactylus
Binomial name
Microcotyle nemadactylus
Dillon & Hargis, 1965[1]
Synonyms
  • Paramicrocotyle nemadactylus (Dillon & Hargis, 1965) Caballero & Bravo-Hollis, 1972[2]

Taxonomy

Microcotyle nemadactylus was first described and redescribed by Dillon & Hargis.[1][3] Caballero y Caballero and Bravo-Hollis erected the genus Paramicrocotyle to describe Paramicrocotyle tampicensis and Paramicrocotyle atriobursata off Mexico; they placed within this genus 16 species previously assigned to the genus Microcotyle[4] including nemadactylus.[2] However, Microcotyle nemadactylus was returned to the genus Microcotyle and Paramicrocotyle is considered a junior subjective synonym of Microcotyle.[5]

Description
The tarakihi Nemadactylus macropterus is the type-host of Microcotyle nemadactylus
The Peruvian morwong Cheilodactylus variegatus is also host of Microcotyle nemadactylus

Microcotyle nemadactylus has the general morphology of all species of Microcotyle, with a flat elongated fusiform body comprising an anterior part which contains most organs and a posterior part called the haptor. The haptor is symmetrical and weakly delineated from body proper, bears 94–102 clamps similar in shape and dissimilar in size, 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 small buccal suckers located at the anterior extremity, and with a rim armed with small, sclerotized, toothlike papillae. The digestive organs include an anterior, terminal mouth, a fairly short esophagus, extending to the posterior margin of the genital atrium, a muscular pharynx, and a posterior intestine with two lateral blind-ending branches. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium consisting of an outer muscular rim of radiating fibers and an inner portion armed with numerous spines, with spines, a dorsal vagina, a single tubular folded ovary, and 16–25 follicular testes which are posterior to the ovary. The eggs are fusiform, with filaments at both end.[1]

Differential diagnosis

Microcotyle nemadactylus resembles Microcotyle bassensis from the gills of Platycephalus bassensis off Australia. They differ in measurements and arrangement of the genital atrium and atrial spines.[1]

Etymology

The specific name of this species, nemadactylus, relates to the generic name of the type host fish, Nemadactylus macropterus.[1]

Hosts and localities

The tarakihi Nemadactylus macropterus (Cheilodactylidae) is the type-host of Microcotyle nemadactylus.[1] The species has been first described from fish caught off New Zealand (Timaru, Canterbury and Dunedin, Otago, South Island).[1] It has also been recorded from the type-host from Lakes Entrance, eastern Victoria, Australia[3] and from the Peruvian morwong Cheilodactylus variegatus (Cheilodactylidae).[6]

References
  1. Dillon, William Arthur; Hargis, William Jr. (1965). "Monogenetic Trematodes from the Southern Pacific Ocean: 2. Polyopisthocotyleids from New Zealand Fishes: The Families Discocotylidae, Microcotylidae, Axinidae, and Gastrocotylidae": 251–280. doi:10.1029/AR005p0251. ISSN 2328-9201. Cite journal requires |journal= (help)
  2. Caballero y Caballero, E., & Bravo-Hollis, M. (1972). Monogenea (van Beneden, 1858) Carus, 1863 de peces marinos del litoral Mexicano del Golfo de Mexico y del Mar Caribe.V. Revista de Biología Tropical, 20, 151–165.
  3. 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.
  4. Mendoza-Franco, Edgar F.; Rosado Tun, Mariela del Carmen; Duarte Anchevida, Allan de Jesús; del Rio Rodríguez, Rodolfo E. (2018). "Morphological and molecular (28S rRNA) data of monogeneans (Platyhelminthes) infecting the gill lamellae of marine fishes in the Campeche Bank, southwest Gulf of Mexico". ZooKeys. 783: 125–161. doi:10.3897/zookeys.783.26218. ISSN 1313-2970. PMC 6160863.
  5. Mamaev, Y. L. (1986). The taxonomical composition of the family Microcotylidae Taschenberg, 1879 (Monogenea). Folia Parasitologica, 33, 199–206.
  6. Oliva, M. E., & Luque, J. L. (1998). Distribution patterns of Microcotyle nemadactylus (Monogenea) on gill filaments of Cheilodactylus variegatus (Teleostei). Memórias do Instituto Oswaldo Cruz, 93(4), 477–478.
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