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Trematodes from Red Sea fishes: Pachycreadium lethrini sp.nov. [Opecoelidae Ozaki, 1925] and Pseudometadena aegyptensis sp.nov. [Cryptogonimidae Ward, 1917], with a review of their genera

100%

Hassanine R. M. E.-S.

Acta Parasitologica

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2006

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tom 51

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nr 3

EN

Specimens of the fishes Lethrinus nebulosus Forsskål (Lethrinidae) and Diplodus noct Valenciennes (Sparidae) were caught in the Red Sea off the coast of Sharm El-Sheikh, South Sinai, Egypt. Ten (33%) and 12 (24%) of these fishes, respectively, were found to harbour intestinal trematodes. L. nebulosus was parasitised by Pachycreadium lethrini sp. nov. (Opecoelidae) and D. noct by Pseudometadena aegyptensis sp. nov. (Cryptogonimidae). P. lethrini sp. nov. is unique in having distinctly unequal testes, contiguous gonads arranged obliquely in the right side of hindbody and a small egg size. However, it differs from each of the other three species of the genus in several other features: from P. gastrocotylum (Manter, 1940) Manter, 1954 in having a smaller sucker ratio and vitelline follicles terminating anteriorly at the level of intestinal bifurcation; from P. carnosum (Rudolphi, 1819) Cortini et Ferretti, 1959 in having a smaller body, a smaller sucker ratio, a genital pore situated ventrally to the anterior border of pharynx, a pretesticular ovary and vitelline follicles extending anteriorly to the level of intestinal bifurcation; and from P. lerneri Sogandares-Bernal, 1959 in having a larger body, a smaller sucker ratio and an unlobed ovary. P. angolensis Aleshkina et Gaevskaya, 1985 is considered an invalid species in Pachycreadium. P. aegyptensis sp. nov. is similar to P. celebesensis Yamaguti, 1952, but mainly differs in having a larger pharynx, a much shorter oesophagus, extensive vitelline acini and a shorter seminal vesicle. Pachycreadium Manter, 1954 and Pseudometadena Yamaguti, 1952 are briefly reviewed.

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Proctocaecum blairi sp. nov. [Digenea, Cryptogonimidae] from the freshwater crocodile, Crocodylus johnstoni, in Northern Territory, Australia

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Tkach V. V. , Snyder S. D.

Acta Parasitologica

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2010

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tom 55

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nr 3

240-244

EN

Proctocaecum blairi sp. nov. is described from specimens found in the intestine of an Australian freshwater crocodile, Crocodylus johnstoni, from Northern Territory, Australia. The most important diagnostic features of the new species are the body proportions and size, the position of the pharynx (relative length of the prepharynx and oesophagus), the relative length and position of the vitelline fields, and the number, shape and size of the circumoral spines. The new species is morphologically most similar to Proctocaecum atae, P. elongatum, P. crocodili, P. gairhei and Acanthostomum slusarskii. It differs from all of these species in having a much longer prepharynx, and differs from both P. atae and P. crocodili in having a much longer body and posteriorly situated vitelline fields. Proctocaecum blairi sp. nov. differs from P. elongatum in having a shorter body, a greater forebody to hindbody ratio, a much smaller ventral sucker, and a higher number of circumoral spines (23 vs 21 in P. elongatum). The new species differs from P. gairhei in possessing a much larger body length:width ratio and an ovary separated from the anterior testis by a seminal receptacle. Acanthostomum slusarskii lacks a gonotyl and has fewer circumoral spines than the new species. Proctocaecum blairi sp. nov. is the third species of Proctocaecum and the fourth cryptogonimid species known from crocodiles in Australia.

3

Topography and ultrastructure of the tegument of Aphallus tubarium (Rodolphi, 1819) Poche, 1926 (Digenea: Cryptogonimidae), intestinal parasite of the common Dentex dentex (Linnaeus 1758) from Valinco Gulf

80%

Antonelli L. , Quilichini Y. , Foata J. , Marchand B.

Acta Parasitologica

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2014

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tom 59

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nr 4

EN

The tegument ultrastructure of the intestinal fluke Aphallus tubarium was studied for the first time with the use of scanning and transmission electron microscopy. New details on morphology were recorded. The ultrastructural study revealed that the tegument of A. tubarium had a syncytial organization with a distal cytoplasm lying over a basal matrix and cytons. The surface of the tegument is covered with pectinate spines arranged quincuncially. As anterior-posterior differences were observed, particular attention was given to spines. Spines decrease in size and density from the anterior part of body to posterior part. Two types of sensory structures were identified, uniciliated and dome-shaped. Type 1 sensory receptors were outgrowths bearing groups of papillae with shorter and rigid apical seta visible on the anterior part of body surface, encircling the worm. Type 2 sensory receptors was dome-shaped papillae devoid of cilia, found mainly around the oral sucker. Diagrams of spines and sensory receptors were made to help in understanding the nature of these structures. Surface morphology may prove to be useful in distinguishing Aphallus spp with other Cryptogonimidae.

4

Varialvus gen. nov. [Digenea, Cryptogonimidae], from species of Lutjanidae [Perciformes] off the Great Barrier Reef, New Caledonia and the Maldives

80%

Miller T. L. , Bray R. A. , Justine J.-L. , Cribb T. H.

Acta Parasitologica

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2010

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tom 55

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nr 4

327-339

EN

A survey of the cryptogonimid trematode fauna infecting Indo-West Pacific Lutjanidae (Perciformes) revealed the presence of four new species whose morphological and genetic differences relative to all other known cryptogonimids warrants the proposal of a new genus, Varialvus gen. nov. Species of this new genus were recovered from sites off Heron and Lizard Islands on the Great Barrier Reef, Australia, New Caledonia and Rasdhoo Atoll, Maldives. Varialvus gen. nov. is distinguished from all other cryptogonimid genera by the combination of a fusiform to oval body, the relatively small number of large oral spines, a median ovary which is relatively condensed and highly lobed, opposite to slightly oblique testes, uterine loops that are restricted to the hindbody and extend well posterior to the testes, and vitelline follicles that are mainly in the forebody but may extend from the anterior margin of the ovary to anterior to the intestinal bifurcation. Bayesian inference analysis of partial large subunit (LSU) rDNA sequence data for these species revealed that they formed a monophyletic clade, despite V. charadrus sp. nov. having a distinctly muscular gonotyl, which based on morphological characters alone may have warranted placement in a separate genus in the absence of DNA sequence data. At least one species of Varialvus gen. nov. is apparently widespread in the Indo-West Pacific. Three species, V. lacertus sp. nov., V. jenae sp. nov. and V. angustus sp. nov. have each been found at only one locality, but V. charadrus sp. nov. was recovered from lutjanids off the Great Barrier Reef, New Caledonia and the Maldives, demonstrating a biogeographic range of at least 10,000 kilometres. Siphoderina lutjani (Saoud, Ramadan et Al Kawari, 1988) Miller et Cribb, 2008 is transferred here as V. lutjani (Saoud, Ramadan et Al Kawari, 1988) n. comb. based on morphological and host group agreement with species of Varialvus gen. nov.

5

Digenetic trematodes of marine fishes from Suva, Fiji [Cryptogonimidae] including description of a new species

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Nahhas F. M. , Tran M. , Nguyen T. P.

Acta Parasitologica

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2003

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tom 48

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nr 3

EN

Four species of digenetic trematodes representing the family Cryptogonimidae are reported: Paracryptogonimus acanthostomus Yamaguti, 1934 from Lutjanus fulviflamma (new host and geographic record), P. provitellosus Durio et Manter, 1969 from L. fulvus (new host and geographic record), P. brevicaecum sp. nov. from L. fulvus and Neoparacryptogonimus ovatus (Yamaguti, 1952) from L. fulviflamma (new host and geographic record). Paracryptogonimus brevicaecum can be distinguished from all species of Paracryptogonimus chiefly by its short caeca, and from P. provitellosus occurring in the same fish host, in its spherical shape, the distribution of the vitelline follicles, and the more posterior position of the ovary relative to the testes.

6

Two new cryptogonimid genera [Digenea, Cryptogonimidae] from Lutjanus bohar [Perciformes, Lutjanidae]: analyses of ribosomal DNA reveals wide geographic distribution and presence of cryptic species

80%

Miller T. L. , Cribb T. H.

Acta Parasitologica

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2007

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tom 52

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nr 2

EN

We describe three new species of Cryptogonimidae belonging to two new genera, Caulanus gen. nov. and Latuterus gen. nov., from the large piscivorous reef fish Lutjanus bohar Forsskål, 1775, recovered from Heron and Lizard Islands off the Great Barrier Reef and Rasdhoo Atoll, Maldives. To support our morphologically based taxonomic approach, three nuclear ribosomal DNA regions (28S, ITS1 and ITS2) were sequenced and analysed to explore the geographic distribution and integrity of the putative species recovered from these widespread localities. Sequencing of the rDNA regions included multiple replicates and revealed three distinct genotypes. Two of the observed genotypes were associated with phenotypically similar specimens of Latuterus, but were each restricted to a single locality, Lizard Island, GBR or Rasdhoo Atoll, Maldives. A posteriori analysis of the associated morphotypes revealed distinct morphological differences and these consistent differences, in combination with the consistent genetic differences led to the recognition of two distinct species in the system. Caulanus is distinguished by having oral spines, caeca which open via ani at the posterior end of the body, tandem testes and uterus that extends from the posterior end of the body to the pharynx. Latuterus is distinguished by lacking oral spines, having multiple/follicular testes, a uterus that is extensive in both fore-and hindbody and vitelline follicles which are confined to the region from the pharynx to oral sucker. Caulanus thomasi sp. nov. had identical sequences for all of the rDNA regions examined from specimens recovered from all three localities, indicating that this species has a wide Indo-Pacific distribution. The species reported here are evidently restricted to Lutjanus bohar because they were never found in large numbers of other lutjanid species sampled at the same localities.

7

Eight new species of Siphoderina Manter, 1934 [Digenea, Cryptogonimidae] infecting Lutjanidae and Haemulidae [Perciformes] of Australia

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Miller T. L. , Cribb T. H.

Acta Parasitologica

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2008

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tom 53

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nr 4

EN

We report nine species, eight of which are new, of cryptogonimids belonging to Siphoderina Manter, 1934 from the intestine and pyloric caeca of five species of Lutjanidae (Lutjanus adetii, L. argentimaculatus, L. carponotatus, L. fulviflamma and L. russelli) and one species of Haemulidae (Plectorhinchus gibbosus) recovered from Heron and Lizard Islands off the Great Barrier Reef, Moreton Bay and Ningaloo Reef in Western Australia. We also report the metacercariae of two species from an atherinid fish, Atherinomorus capricornensis, from near Heron Island. Morphological analysis of the species reported here was augmented by DNA sequence analyses utilizing data from the internal transcribed spacers (ITS) 1 and 2, large subunit (LSU) and 5.8S nuclear ribosomal DNA to explore the integrity of the species and their biogeographic distributions. The analysis found strong support for the integrity of Siphoderina and found that it is the sister-taxon to Beluesca Miller et Cribb, 2007. Sequencing included multiple replicates and no intraspecific variation was observed between any of the taxa over the rDNA regions examined. Sequence data from the ITS and LSU regions were analysed with that of species of Beluesca, Caulanus Miller et Cribb, 2007, Chelediadema Miller et Cribb, 2007, Latuterus Miller et Cribb, 2007, Neometadena Hafeezullah et Siddiqi, 1970 and Retrovarium Miller et Cribb, 2007 which all also infect lutjanids or haemulids. Some closely related species of Siphoderina infect only distantly related fishes among the haemulids and lutjanids whereas others form clusters in association with clusters of closely related lutjanids. This pattern suggests a history of some co-evolutionary divergence together with significant host switching. Pseudallacanthochasmus Velasquez, 1961 is considered a synonym of Siphoderina and the new combinations S. grandispinus (Velasquez, 1961) n. comb. and S. magnivesiculum (Gaevskaya et Aljoshkina, 1985) n. comb. are proposed. As a result of the new species described here and these new combinations, Siphoderina now contains 43 species, making it by far the largest genus of the Cryptogonimidae.

8

Life cycle of Acanthostomoides apophalliformis [Trematoda, Cryptogonimidae] from Percichthys trucha {Pisces, Percichthyidae] in Patagonia, Argentina

80%

Ostrowski de Nunez M. , Semenas L. , Viozzi G. , Flores V. , Brugni N.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3