Yumura, N., K. Adachi, M. Nitta, Y. Kondo, S. Komeda K. Wakabayashi, J. Fukuchi, G.A. Boxshall & S.Ohtsuka. (2022). Exploring evolutionary trends within the Pennellidae (Copepoda: Siphonostomatoida) using molecular data. Systematic Parasitology. 99(4): 1-13. .May 2022.
Yumura, N., K. Adachi, M. Nitta, Y. Kondo, S. Komeda K. Wakabayashi, J. Fukuchi, G.A. Boxshall & S.Ohtsuka
2022
Exploring evolutionary trends within the Pennellidae (Copepoda: Siphonostomatoida) using molecular data.
Systematic Parasitology
99(4): 1-13. .May 2022
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The family Pennellidae comprises ectoand mesoparasitic copepods on marine ?shes. Although a preliminary scheme of phylogenetic relationships of pennellids based on morphological characters exists, it is dif?cult to objectively de?ne character states because of their highly modi?ed bodies and reduced appendages. This molecule-based study analysed phylogenetic relationships among seven genera and 12 species of pennellids, using 18S and 28S ribosomal DNA sequences in order to infer evolutionary trends within the family. Our molecular analysis recovered three clades (Clade-I, Peniculus; Clade-II, Haemobaphes-Lernaeocera-Phrixocephalus-Exopenna-Lernaeenicus radiatus; and Clade-III, Pennella-Lernaeenicus spp.). This result was congruent with some of the morphology-based phylogenetic relationships previously proposed but did not support a sister group comprising Exopenna, Phrixocephalus and Pennella. The second and third offshoots after the divergence of Clade-I species are characterized by reduced body tagmosis and changes in lifestyle from ectoparasites to mesoparasites. In some gi
