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Molecular characterization of two opecoelid trematodes from fishes in the Gulf of Mexico, with a description of a new species of Helicometra

100%

Andres M. J., Ray C. L., Pulis E. E., Curran S. S., Overstreet R. M.

Acta Parasitologica

2014

tom 59

nr 3

The plagioporine opecoelids Helicometra fasciata (Rudolphi, 1819) Odhner, 1902, and Macvicaria crassigula (Linton, 1910) Bartoli, Bray, and Gibson, 1989 have been reported from fishes in expansive geographic regions, disjointed from their type localities. New material of M. crassigula was collected from near its type locality as well as specimens resembling Helicometra fasciata sensu lato from three triglids in the Gulf of Mexico. Comparisons of the ribosomal DNA (rDNA) sequences, comprising the partial 18S rDNA, internal transcribed spacer region (= ITS1, 5.8S, and ITS2), and partial 28S rDNA gene, from M. crassigula and Helicometra fasciata sensu lato in the Gulf of Mexico were made with sequences deposited in GenBank from those species from the Mediterranean Sea. Results reveal that M. crassigula sensu stricto from the Gulf of Mexico is distinct from the two cryptic species of M. crassigula sensu lato from the Mediterranean Sea and Helicometra fasciata sensu lato in this study differs from H. fasciata sequences from the Mediterranean Sea, thus Helicometra manteri sp. nov. is described.

Ultrastructure of spermiogenesis and the spermatozoon of Helicometra fasciata [Digenea, Opecoelidae] a parasite of Labrus merula [Pisces, Teleostei]

100%

Levron C., Ternengo S., Marchand B.

Acta Parasitologica

2003

tom 48

nr 4

Spermiogenesis in Helicometra fasciata is characterized by an unusual flagellar rotation. Indeed, a rotation of the axonemes, higher than 90°, occurs. Nevertheless, the general pattern is the same as in the other digenean trematodes examined. The zone of differentiation presents striated rootlets associated with two centrioles, and an intercentriolar body. The nucleus and mitochondrion migrate in the median cytoplasmic process. An asynchronic proximo-distal fusion takes place. The mature spermatozoon possesses five regions and two axonemes with the 9 + ‘ 1 ’ pattern, nucleus, mitochondrion, glycogen granules and two bundles of parallel cortical microtubules. Despite these features, there are some other peculiarities that distinguish the spermatozoon of H.fasciata. A centriolar derivative and a lateral expansion were observed in the anterior region. To discuss the phylogenetic relationships, comparison is made with Opecoeloides furcatus, the only other opecoeloid for which the reproduction characters were described.

Ograniczanie wyników

2 Acta Parasitologica

1 Andres M. J.

1 Curran S. S.

1 Levron C.

1 Marchand B.

1 Overstreet R. M.

1 Pulis E. E.

1 Ray C. L.

1 Ternengo S.

1 2014

1 2003

Wyniki wyszukiwania

Molecular characterization of two opecoelid trematodes from fishes in the Gulf of Mexico, with a description of a new species of Helicometra

Ultrastructure of spermiogenesis and the spermatozoon of Helicometra fasciata [Digenea, Opecoelidae] a parasite of Labrus merula [Pisces, Teleostei]