Comprehensive analysis of jellyfish Chrysaora pacifica with complete
Here, we firstly sequenced a single rDNA repeat
unit (8,167 bp) from the jellyfish Chrysaora
pacifica. The tandemly repeated rDNA units were found to be the
same as that of typical eukaryotes. Comparative analyses showed that
28S rDNA is highly informative and divergent compared to the 18S.
Phylogenetic analyses revealed that the Semaeostomeae jellyfishes are
separated into each taxonomic group by families and genera. The family
Pelagiidae was in a clade separate from other groups, forming a
monophyletic lineage. All Chrysaora
included here formed a strongly supported clade within the family
Pelagiidae. Chrysaora was
found to be paraphyletic in both 18S and 28S phylogenies. Chrysaora pacifica was clearly
distinct from close relatives C.
melanaster and C.
quinquecirrha. These provide a special reference for rDNA
taxonomy of Pelagiidae jellyfishes and improve understanding of their
molecular phylogenetic relationships.
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