Three species of Calydiscoides (Monogenea: Diplectanidae) from five Lethrinus spp. (Lethrinidae: Perciformes) off New Caledonia, with a description of Calydiscoides terpsichore sp. n.

Parasitology International

2012

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Species of the diplectanid monogenean genus Pseudorhabdosynochus are strictly host-specific (specialist), with the exception of P. cyanopodus, which was reported in New Caledonia, South Pacific, from two host species, Epinephelus cyanopodus and E. chlorostigma. We sequenced the COI gene of both host fish species and of their monogeneans. Morphological identification and pairwise distances showed that the two fish species were distinct (difference 6.1-6.6%), but that their monogeneans were not (difference 0-1.5%). A morphological study of sclerotised parts showed that specimens of P. cyanopodus are similar in both fish. Most species of groupers and their associated Pseudorhabdosynochus species are from warm surface waters, but the two groupers E. cyanopodus and E. chlorostigma are usually caught in deep-sea on the outer slope of the coral reef. This suggests that acquisition of a less strict host specificity is an adaptation of P. cyanopodus to deep-sea hosts.

Section: Discussionmentioning

confidence: 99%

Are all species of Pseudorhabdosynochus strictly host specific? — A molecular study

Schoelinck

Cruaud

Parasitology International

2012

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“…It is generally admitted that sparids, centracanthids, lethrinids and nemipterids are closely related within the Sparoidea (Day, 2002;Orrell & Carpenter, 2004;Miller & Cribb, 2007). It is interesting to note ( Table 7) that species of Calydiscoides spp., which are morphologically close to Lamellodiscus, sharing lamellodiscs with closed and crescent-shaped elements, are found in nemipterids and lethrinids (Oliver, 1987;Lim, 2003;Justine, 2007b;Justine & Brena, 2009;Rascalou & Justine, 2007). Within the Lethrinidae, they are found in the Lethrininae (genus Lethrinus) but not in the Monotaxinae (genera Gymnocranius, Gnathodentex or Monotaxis).…”

Section: Discussionmentioning

confidence: 99%

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

Briand

2010

Syst Parasitol

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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). Lamellodiscus tubulicornis 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.

“…They include C. flexuosus (Yamaguti, 1953) Young, 1969C. convolutus (Yamaguti, 1953) Justine, 2007C. japonicus (Pillai et Pillai, 1976) Thoney, 1989;C.…”

Section: Differential Diagnosismentioning

confidence: 99%

“…This structure can provide a variety of measurements. The number of lamellae is 10 in all seven species from lethrinids (Justine 2007b, Rascalou andJustine 2007); for species from nemipterids, it is also 10 in C. flexuosus (see Kritsky et al 2000), C. cymbidioides, C. monogrammae (9-11), C. conus (9-11), C. scolopsidis (9-11) and C. kemamanensis (9-11); it is 7-8 in C. convolutus, and 7 in C. nemipteris and C. limae (Yamaguti 1953, Thoney 1989, Ding and Zhang 1996, Kritsky et al 2000, Lim 2003. Thus it appears that there are only two patterns, with 7 or 10 lamellae, among all the 17 species of the genus.…”

Section: Remarksmentioning

confidence: 99%

“…The genus was later revised (Oliver 1987, Thoney 1989, Lim 2003, and Lim (2003) recently described four new species from nemipterids. Justine (2007b) redescribed the type specimens of all species from lethrinids, described the new species Calydiscoides euzeti Justine, 2007 and transferred Lamellodiscus convolutus Yamaguti, 1953 to the genus as Calydiscoides convolutus (Yamaguti, 1953) Justine, 2007. Rascalou andJustine (2007) studied seven species from various lethrinids and described the new species Calydiscoides terpsichore Rascalou et Justine, 2007.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Calydiscoides limae sp. nov. (Monogenea, Diplectanidae) from Pentapodus aureofasciatus (Perciformes, Nemipteridae) off New Caledonia

Brena

2009

Acta Parasitologica

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Calydiscoides limae sp. nov. is described from the nemipterid Pentapodus aureofasciatus Russell, 2001 caught along the barrier reef off New Caledonia, South Pacific. The new species is characterised by its male copulatory organ, with a distal blade and a lateral spur, and its female sclerotised organ, with a sphere and a thin tube. Its lamellodiscs always have 7 concentric lamellae, with the 3 internal lamellae complete and the 4 peripheral lamellae progressively less and less complete; measurements of the angles occupied by the lamellae in numerous specimens showed that the lamellodisc structure shows little variation among individuals. RésuméCalydiscoides limae sp. nov. est décrit du Nemipteridae Pentapodus aureofasciatus Russell, 2001 pLché le long du récif barriPre de Nouvelle-Calédonie, Pacifique Sud. La nouvelle espPce est caractérisée par son organe copulateur mâle, avec une lame distale et un éperon latéral, et par son organe sclérifié femelle, avec une sphPre et un tube fin. Ses lamellodisques ont toujours 7 lamelles concentriques, avec les 3 lamelles internes complPtes et les 4 lamelles périphériques progressivement de moins en moins complPtes. La mesure des angles occupés par les lamelles chez de nombreux spécimens montre que la structure des lamellodisques est peu variable entre les individus.