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Acta Parasitologica

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Volume 62, Issue 2 (Jun 2017)

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Redescription of Philometra margolisi Moravec, Vidal-Martínez et Aguirre-Macedo, 1995 (Nematoda: Philometridae), a gonad-infecting parasite of the red grouper Epinephelus morio (Serranidae) in the Gulf of Mexico

František Moravec
  • Corresponding author
  • Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic
  • Email:
/ Micah D. Bakenhaster
  • Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, 100 Eighth Avenue Southeast, St. Petersburg, Florida 33701, USA
/ Erin H. Leone
  • Center for Biostatistics and Modeling, Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, 1105 Southwest Williston Rd. Gainesville, Florida 32601, USA
Published Online: 2017-04-18 | DOI: https://doi.org/10.1515/ap-2017-0049

Abstract

The insufficiently known nematode species Philometra margolisi Moravec, Vidal-Martínez et Aguirre-Macedo, 1995 (Philometridae) is redescribed based on light and scanning electron microscopical (SEM) examinations of specimens collected from the gonad of the type host, the red grouper Epinephelus morio (Valenciennes) (Serranidae, Perciformes), in the northern Gulf of Mexico off Florida, USA. Also, new prevalence data for females of P. margolisi were derived from 188 fish, and a subset of these (n = 38) were used to determine prevalence and intensity of male nematodes. The male of this species was studied with SEM for the first time, which revealed some new, taxonomically important morphological features. The male posterior end had a V-shaped caudal mound, four pairs of minute adanal papillae, a pair of large papillae located posterior to the cloacal aperture and a pair of very small phasmids. The distal end of the gubernaculum is unique among all gonad-infecting species of Philometra parasitizing serranids in that its ventral surface is flat, smooth, without the usual two longitudinal grooves; the dorsal lamellate structures on the gubernaculum are also different in this species. In contrast to data in the original species description, the body length of gravid females of P. margolisi was 132–280 mm. Overall prevalence for male nematodes (76.3%) was much higher than for females (15.4%), and female nematode prevalence was higher in samples collected during host spawing season than out of season (27.1% and 3.3%, respectively).

Keywords: Nematode parasite; Dracunculoidea; marine fish; USA; seasonal occurrence

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About the article

Received: 2016-11-16

Revised: 2017-01-20

Accepted: 2017-01-26

Published Online: 2017-04-18

Published in Print: 2017-06-01



Citation Information: Acta Parasitologica, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2017-0049. Export Citation

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