Species of Tetrancistrum Goto & Kikuchi, 1917 (Monogenea: Dactylogyridae) from the gills of the whitespotted rabbitfish, Siganus canaliculatus (Park) (Perciformes: Siganidae) off Omani coasts, with a description of Tetrancistrum labyrint

Autor:
Al-Jufaili, S.; Palm, H. W. 2017
In:

Systematic Parasitology

Bandangabe: 94
Auflage: 7
ISBN: 1573-5192
DOI: 10.1007/s11230-017-9739-z
Seite: 809 - 818
Jahr: 2017

Einordung:
Institut: Professur Aquakultur und Sea-Ranching

Abstract:
Tetrancistrum labyrinthus n. sp. is
described from the gills of the marine herbivorous
fish Siganus canaliculatus (Park) found in the Western
Indian Ocean (Sea of Oman and Arabian Sea).
Comparative morphological analyses of all previously
described species of Tetrancistrum Goto & Kikuchi,
1917 confirmed the distinct status of T. labyrinthus n.
sp. The new species closely resembles T. suezicum
Paperna, 1972 and T. oraminii Young, 1967 in the
morphology of the male copulatory organ. However, it
can be distinguished by possessing a thin handle-like
anterior basal flange and a compound accessory piece
that is composed of a tapering rod-shaped anterior part
and a large cylindrical, elongated posterior part. The
new species can be further distinguished from other
Tetrancistrum species by its highly sclerotised and
complex disc-shaped vaginal vestibule. This is the first
record of Tetrancistrum from the Sea of Oman and
Arabian Sea, and the fourth of nominal species of
Tetrancistrum known to parasitise Siganus canaliculatus
(Park). In addition, T. indicum Paperna, 1972 is
re-described here with an updated locality record.

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