Molecular phylogeny of the genus Themisto (Guérin, 1925) (Amphipoda: Hyperiidae) in the Northern Hemisphere
2017; Oxford University Press; Volume: 37; Issue: 6 Linguagem: Inglês
10.1093/jcbiol/rux076
ISSN1937-240X
AutoresAstrid Tempestini, Louis Fortier, Alexei I. Pinchuk, France Dufresne,
Tópico(s)Identification and Quantification in Food
ResumoThe Amphipoda is a highly speciose order of crustaceans with a life cycle characterized by direct development and no larval stage, making them interesting models for studies on marine speciation. The family Hyperiidae Dana, 1852 is a strictly pelagic group of Amphipoda. In northern latitudes, free-swimming hyperiids belonging to the genus Themisto (Guérin, 1825) are important components of marine ecosystems in term of abundance and biomass, but little is known about their genetic relationships. We present the first multi-locus molecular phylogenetic assessment of the Themisto in the Northern Hemisphere. We performed Bayesian and maximum likelihood reconstructions based on three nuclear loci (18S rDNA, 28S rDNA, and Histone 3) and mitochondrial cytochrome oxidase I data on eight specimens of Themisto from the Pacific, Arctic, and Atlantic oceans. We also provide an updated molecular phylogeny of Hyperiidae. Based on our multi-locus phylogeny, we report the presence of cryptic species in the North Pacific. Our results are discussed in the light of marine speciation.
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