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- IOC - Artigos de Periódicos [12776]
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NEONEMATOBOTHRIUM ANNAKOHNAE N. SP. (DIGENEA: DIDYMOZOIDAE) PARASITIZING EUTHYNNUS ALLETTERATUS (PERCIFORMES: SCOMBRIDAE) IN THE SOUTHWEST ATLANTIC OCEAN
Afiliação
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Helmintos Parasitos de Peixes. Rio de Janeiro, RJ, Brasil.
Resumo em Inglês
Purpose Describe a new species of didymozoid digenean Neonematobothrium Yamaguti, 1965 from the operculum of the
scombrid fish, Euthynnus alletteratus (Rafinesque, 1810), in the Southwest Atlantic Ocean off Brazil.
Methods Thirty-four specimens of E. alletteratus were collected in the coastal zone of the state of Rio de Janeiro and
obtained from local fishermen between 2006 and 2018 in the municipal market of São Pedro in Niterói, Brazil. The parasites
were fixed in AFA (93% ethanol 70%, 5% formaldehyde, 2% glacial acetic acid) without pressure, stained with Langeron
alcoholic acid carmine, dehydrated in an alcohol series, cleared in beachwood creosote or clove oil and mounted in Canada
balsam as permanent slides.
Results Neonematobothrium annakohnae n. sp. is a member of the genus based on a combination of the following characteristics:
body free, uncapsulated; body long and dorsoventrally flattened; esophagus surrounded by gland cells; ovary and
vitellarium single, long, narrow and unbranched in the anterior and posterior halves of the body, respectively; uterus with
three loops; and site of infection in subcutaneous tissue of scombrid fish. The new species differs from the two recognized
species of the genus mainly by the size of the body, which is much larger, the shape of the genital pore, which is differentiated
in a structure similar to a small sucker and by esophagus without diverticula.
Conclusions Neonematobothrium annakohnae n. sp. parasite of E. alletteratus from the Southwest Atlantic Ocean, described
herein, represents the third species of Didymozoidae belonging to the genus Neonematobothrium. The two known species
Neonematobothrium kawakawa Yamaguti, 1965 and Neonematobothrium dorsale Yamaguti, 1970 were described from fish
belonging to the same genus of the host from Pacific Ocean. The diagnosis of the genus is enlarged to “esophagus with or
without diverticula”, to fill the characteristics presented by the new species. The description of N. annakohnae n. sp. demonstrates
the need to expand the studies of these interesting and intriguing group of parasites, due to the fact that number of
known didymozoids taxa in the Atlantic Ocean is far from representing the real situation.
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