Phylogenetic relationships of the family Gryporhynchidae (Cestoda: Cyclophyllidea) inferred through SSU and LSU rDNA sequences
Por:
Ortega-Olivares, M. P., Garcia-Varela, M.
Publicada:
1 nov 2019
Resumen:
Tapeworms of the family Gryporhynchidae are endoparasites of fish-eating
birds distributed worldwide. Currently the family contains 16 genera
classified on the basis of the morphology of the rostellar apparatus,
rostellar hooks and strobilar anatomy. However, the phylogenetic
relationships among the genera are still unknown. In this study,
sequences of the near complete 18S (SSU) and 28S (LSU) from rDNA of 13
species of gryporhynchids (adult specimens) representing eight genera
(Cyclustera, Dendrouterina, Glossocercus, Gryporhynchidae gen. sp.,
Neovalipora, Paradilepis, Parvitaenia, Valipora) and one species of
metacestode from fish (Neovalipora) were generated. Additionally,
sequences of metacestodes of the genera Amirthalingamia,
Neogryporhynchus, Paradilepis, Parvitaenia and Valipora from Africa
recently added to the GenBank database were analysed. Phylogenetic
relationships were inferred using maximum-likelihood (ML) and Bayesian
inference of each (SSU and LSU) dataset. The phylogenetic analyses
indicated that the family Gryporhynchidae is a well-supported
monophyletic group within the Cyclophyllidea. The trees inferred with
SSU and LSU datasets had similar topologies and suggested that the
genera Glossocercus (two species sequenced) and Paradilepis (four spp.)
are monophyletic. In contrast, Dendrouterina, Parvitaenia and Valipora
are paraphyletic, suggesting that the species composition of these
genera should be critically reviewed. Interestingly, species of the
genera that use the same groups of definitive hosts such as herons
(Ardeidae), cormorants (Phalacrocoracidae) and ibis (Threskiornithidae)
are together in the phylogenetic tree, even though they differ markedly
from each other in some morphological characters, especially shape and
size of rostellar hooks.
Filiaciones:
Ortega-Olivares, M. P.:
Univ Nacl Autonoma Mexico, Dept Zool, Inst Biol, Ave Univ 3000,Ciudad Univ, Cuidad De Mexico 04510, Mexico
Garcia-Varela, M.:
Univ Nacl Autonoma Mexico, Dept Zool, Inst Biol, Ave Univ 3000,Ciudad Univ, Cuidad De Mexico 04510, Mexico
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