Folia Parasitologica 68:008 (2021) | DOI: 10.14411/fp.2021.008

Morphological and genetic description of two new species of philometrid nematodes (Philometridae) parasitic in needlefishes (Belonidae) from estuaries of Florida, USA

František Moravec ORCID...1, Micah D. Bakenhaster2, Seifu Seyoum2, Michael D. Tringali2
1 Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic;
2 Fish and Wildlife Research Institute, Florida Fish and Wildlife Conservation Commission, St. Petersburg, Florida, USA

Two new species of philometrid nematodes (Philometridae) from needlefishes (Belonidae) in Florida are described based on morphological and genetic characteristics: Philometra aequispiculata sp. n. (males and females) collected from the ovary of Strongylura marina (Walbaum) (type host) and Strongylura notata (Poey), and Philometra notatae sp. n. (females) from the swimbladder of S. notata. Both species are described and illustrated based on light and scanning electron microscopical examinations. Morphologically, P. aequispiculata sp. n. differs from all congeners mainly in the unique structure of the distal tip of the gubernaculum, whereas P. notatae sp. n. is mainly characterised by the presence of eight markedly large cephalic papillae of the outer circle in gravid and subgravid females, the body length of the gravid female (54 mm) and by the absence of caudal projections. Molecular characterisation of the new species was assessed from phylogenetic analysis of mitochondrial cytochrome c oxidase I (COI) and SSU rRNA small-subunit ribosomal RNA (SSU) sequences among closely related philometrids by way of Bayesian inference. Phylogenetic reconstructions based on COI and SSU sequences show each of the new species comprise discrete ancestor-descendent lineages.

Keywords: Parasitic nematode, Philometra, Barracudia, marine fish, Strongylura, Atlantic Ocean, North America, Tampa Bay, Apalachicola Bay, integrated taxonomy

Received: July 2, 2020; Revised: December 3, 2020; Accepted: December 7, 2020; Published online: April 13, 2021  Show citation

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Moravec, F., Bakenhaster, M.D., Seyoum, S., & Tringali, M.D. (2021). Morphological and genetic description of two new species of philometrid nematodes (Philometridae) parasitic in needlefishes (Belonidae) from estuaries of Florida, USA. Folia Parasitologica, 68, Article 2021.008. https://doi.org/10.14411/fp.2021.008
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