Neotropical Monogenoidea. 24. Rhinoxenus bulbovaginatus n. sp. (Dactylogyridae, Ancyrocephalinae) from the nasal cavity of Salminus maxillosus (Osteichthyes, Characidae) from the Rio Paraná, Paraná, Brazil

Memórias do Instituto Oswaldo Cruz

Walter A. Boeger²  Marcus V. Domingues²  Gilberto C. Pavanelli¹ 

[1] ,Universidade Federal do Paraná Departamento de Zoologia Curitiba,Brasil

关键词: Dactylogyridae;    Ancyrocephalinae;    Rhinoxenus bulbovaginatus n. sp.;    Salminus maxillosus;    phylogeny;   

DOI  :  10.1590/S0074-02761995000600007

来源: SciELO

【 摘 要 】

Rhinoxenus bulbovaginatus n. sp. is described from the nose of Salminus maxillosus (Characidae) collected in the basin of the rio Paraná, near the city of Porto Rico, state of Paraná, Brazil. The new species can be differentiated from the other three species in the genus by the morphology of the copulatory complex, vagina, and ventral anchor. The sister group relationship of the known species of Rhinoxenus was determined using techniques of Phylogenetic Systematics (Cladism). The resulting cladogram (C.I.=100%) indicates that the new species is most closely related to R. piranhus Kritsky, Boeger and Thatcher, 1988. The other two species of the genus, R. arietinus Kritsky, Boeger and Thatcher, 1988 and R. nyttus Kritsky, Boeger and Thatcher, 1988, both parasites of Anostomidae fishes, have a paraphyletic position in the cladogram, suggesting that the origin of at least one of them can not be associated to cospeciation.

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