Sibitrema poonui

Sibitrema poonui
	Silhouette of the body of Sibitrema poonui
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Platyhelminthes
Class:	Monogenea
Order:	Mazocraeidea
Family:	Gastrocotylidae
Genus:	Sibitrema
Species:	S. poonui
Binomial name
	Sibitrema poonui; Yamaguti, 1966

Sibitrema poonui is a

gills of a marine fish. It belongs to the family Gastrocotylidae.^[1]

Systematics

Sibitrema poonui was described based on a single specimen from the bigeye tuna Parathunnus sibi (currently named

Thunnus obesus ^[2](Scombridae), and designated as the type species of the genus.^[1]^[3] Mamaev (1967) established a new genus Metapseudaxine for monogeneans similar to Sibitrema.^[4] Metapseudaxine was synonymized with Sibitrema.^[5]^[3]

Sibitrema poonui was described based on 48 specimens from the gills of Cybiosarda elegans and Euthynnus alleteratus off Australia. Australian specimens has a larger body size and differed also in some organ sizes. The differences between the Hawaiian and Australian populations were not significant, especially in view of the identical structure of the genital atrium, the clamps, the hooks and the vaginae.^[3]

Description

Sibitrema poonui has a smooth or partly scalloped, extremely body, consi1stmg of three parts: a long wide anterior part gradually tapering anteriorly in its anterior half or third, a narrow neck, and a long opisthaptor. The body comprises an anterior part which contains most organs and a posterior part called the

intestine that bifurcates in two lateral branches. The intestinal branches are provided with medial and lateral diverticula, joined in posterior part of opisthaptor and extending as a single branch with short diverticula to level of most posterior clamps, or not joined and one branch terminate some distance in front of the other. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium armed with a single circle of curved terminally bifurcated spines, one row of ventrolateral vaginal openings on each side of the body behind the level of gonopore, each opening surrounded by muscles, a foldedovary and numerous large irregularly shaped testes pre, para and post-ovarian. Eggs are fusiform, with filaments at both ends.^[3]

Hosts and localities

The type-host is the bigeye tuna

Thunnus albacares.^[6]^[7]

Sibitrema poonui was first described of fishes caught off Hawaii.^[1] It was reported off Australia,^[3] Ivory Coast and Senegal,^[6] and off Brazil.^[7]

Gallery

Hosts of Sibitrema poonui. All of them are Scombridae.

The bigeye tuna
Thunnus obesus (Scombridae
) is the type host of Sibitrema poonui

The little tunny Euthynnus alletteratus
The leaping bonito Cybiosarda elegans
The yellowfin tuna Thunnus albacares

References

^ ^a ^b ^c ^d Yamaguti, S. (1966). "New monogenetic trematodes from Hawaiian fishes, II". Pacific Science. 20 (4): 419-134.
^ Froese, R. and D. Pauly. Editors. (2019). FishBase. Parathunnus sibi (Temminck & Schlegel, 1844). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=320087 on 2019-03-06
^ ^a ^b ^c ^d ^e ^f Rohde, K (1978). "Monogenea of Australian marine fishes. The genera Dionchus, Sibitrema and Hexastoma". Publ Seto Mar Biol Lab. 24: 349-367
^ Mamaev, Yu. L. (1967). "Pseudaxine triangula sp. n. and Metapseudaxine ventrosicula gen. et sp. n. and their position in the system ofmonogeneans". Zoo. sh. 46 (7): 993-998. (in Russian).
^ Lebedev, B.I. (1968). "Monogenea from fishes of the New Zealand Australian shelf and the South China Sea (Monogenoidea: Gastrocotylidae, Gastrocotylinae)". In: Mamaev, Yu.L. (1968). "Helminths of animals of the Pacific Ocean". Nauka: Moscow. 46-55.
^ ^a ^b Bussieras, J. & Baudin-Laurencin, F. (1973) "Helminth parasites of tropical tunas". Revue d'élevage et de médecine vétérinaire des pays tropicaux. 26 (4): 13-19. (In French) PDF
^ ^a ^b Kohn, A., dos Santos, A. L., & Cohen, S. C. (2003). "Report of two parasites from brazilian tunas". Arquivos de Ciências do Mar. 36 (1–2): 19-22. PDF

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[Yamaguti1966-1] Yamaguti, S. (1966). "New monogenetic trematodes from Hawaiian fishes, II". Pacific Science. 20 (4): 419-134.

[2] Froese, R. and D. Pauly. Editors. (2019). FishBase. Parathunnus sibi (Temminck & Schlegel, 1844). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=320087 on 2019-03-06

[Rohde1978-3] ^ ^a ^b ^c ^d ^e ^f Rohde, K (1978). "Monogenea of Australian marine fishes. The genera Dionchus, Sibitrema and Hexastoma". Publ Seto Mar Biol Lab. 24: 349-367

[4] Mamaev, Yu. L. (1967). "Pseudaxine triangula sp. n. and Metapseudaxine ventrosicula gen. et sp. n. and their position in the system ofmonogeneans". Zoo. sh. 46 (7): 993-998. (in Russian).

[5] Lebedev, B.I. (1968). "Monogenea from fishes of the New Zealand Australian shelf and the South China Sea (Monogenoidea: Gastrocotylidae, Gastrocotylinae)". In: Mamaev, Yu.L. (1968). "Helminths of animals of the Pacific Ocean". Nauka: Moscow. 46-55.

[Bussieras1973-6] Bussieras, J. & Baudin-Laurencin, F. (1973) "Helminth parasites of tropical tunas". Revue d'élevage et de médecine vétérinaire des pays tropicaux. 26 (4): 13-19. (In French) PDF

[Kohn2003-7] Kohn, A., dos Santos, A. L., & Cohen, S. C. (2003). "Report of two parasites from brazilian tunas". Arquivos de Ciências do Mar. 36 (1–2): 19-22. PDF

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