Systematic Parasitology

, Volume 75, Issue 3, pp 159–179 | Cite as

Three new species, Lamellodiscus tubulicornis n. sp., L. magnicornis n. sp. and L. parvicornis n. sp. (Monogenea: Diplectanidae) from Gymnocranius spp. (Lethrinidae: Monotaxinae) off New Caledonia, with the proposal of the new morphological group ‘tubulicornis’ within Lamellodiscus Johnston & Tiegs, 1922

Article

Abstract

Three new species of Lamellodiscus are described from four (including two undescribed) species of Gymnocranius off New Caledonia, South Pacific. All three species have a similar body anatomy and morphology of the haptoral hard parts and are distinguished on the basis of the male copulatory organ (MCO). Lamellodiscustubulicornis n. sp. (type-host: G. grandoculis; other host: Gymnocranius sp. B) has an MCO with a tube and horn; L. magnicornis n. sp. (type-host: G. grandoculis; other hosts: G. euanus, Gymnocranius sp. A and Gymnocranius sp. B) has an MCO with a long horn and a membrane; L. parvicornis n. sp. (type-host: G. euanus; other hosts: G. grandoculis and Gymnocranius sp. B) has an MCO with a small horn and a membrane. Lamellodiscus epsilon Yamaguti, 1968 is redescribed based on the type-specimens (from Monotaxis grandoculis off Hawaii). Lamellodiscus sp. is recorded from Gnathodentex aureolineatus off New Caledonia. All these five species have lamellodiscs that exhibit a unique characteristic: the second lamella forms an almost closed circle, in contrast to all other described species of Lamellodiscus in which the second lamella has the form of one or two crescents. Lamellodiscus spp. are usually classified in two groups, the ‘ignoratus’ and ‘elegans’ groups, according to the structure of the lamellodisc; we propose a new ‘tubulicornis’ group for these five species. In addition to their lamellodisc structure, species of the tubulicornis group are also characterised by their egg (elongate in contrast to tetrahedral in the two other groups) and their hosts (monotaxine lethrinids as opposed to mainly sparids). The generic diagnosis of Lamellodiscus given by Amine & Euzet (2005) is amended to include species with elongate eggs.

Résumé

Trois nouvelles espèces de Lamellodiscus sont décrites de quatre espèces de Gymnocranius (y compris deux non décrites) de Nouvelle-Calédonie, Pacifique Sud. L’anatomie du corps et la morphologie des pièces sclérifiées du hapteur sont similaires chez les trois espèces, qui sont distinguées par leur organe copulateur mâle (OCM). Lamellodiscus tubulicornis n. sp. (hôte-type: G. grandoculis; autre hôte: Gymnocranius sp. B) a un OCM avec tube et corne. L. magnicornis n. sp. (hôte-type: G. grandoculis; autres hôtes: G. euanus, Gymnocranius sp. A, Gymnocranius sp. B) a un OCM avec longue corne et membrane. L. parvicornis n. sp. (hôte-type: G. euanus; autres hôtes: G. grandoculis, Gymnocranius sp. B) a un OCM avec petite corne et membrane. Lamellodiscusepsilon Yamaguti, 1968 est redécrit à partir des spécimens-types (de Monotaxis grandoculis, Hawaï). Lamellodiscus sp. est mentionné de Gnathodentex aureolineatus en Nouvelle-Calédonie. Ces cinq espèces ont des lamellodisques qui montrent une caractéristique originale: la deuxième lamelle forme un cercle presque clos, au contraire des autres espèces décrites de Lamellodiscus chez lesquelles la deuxième lamelle a la forme d’un ou de deux croissants. Les espèces de Lamellodiscus sont habituellement classées en deux groupes ‘ignoratus’ et ‘elegans’, en fonction de la structure des lamellodisques. Nous proposons un nouveau groupe ‘tubulicornis’ pour ces cinq espèces. En plus de la structure de leurs lamellodisques, les espèces du groupe tubulicornis sont aussi caractérisées par leurs œufs (allongés au lieu de tétraédriques dans les deux autres groupes) et leurs hôtes (Lethrinidae Monotaxinae au lieu de majoritairement Sparidae). La diagnose du genre Lamellodiscus par Amine & Euzet (2005) est changée pour inclure des espèces à œuf allongé.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  1. 1.Équipe Biogéographie Marine Tropicale, Unité Systématique, Adaptation, Évolution (CNRS, UPMC, MNHN, IRD)Institut de Recherche pour le DéveloppementNouméa CedexNew Caledonia

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