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Molecular data reveal a tropical freshwater origin of Naidinae (Annelida, Clitellata, Naididae)

Artikel i vetenskaplig tidskrift
Författare Christer Erséus
Ida Envall
Pierre De Wit
Lena Gustavsson
Publicerad i Molecular Phylogenetics and Evolution
Volym 115
Sidor 115-127
ISSN 1055-7903
Publiceringsår 2017
Publicerad vid Institutionen för marina vetenskaper
Institutionen för biologi och miljövetenskap
Sidor 115-127
Språk en
Länkar https://doi.org/10.1016/j.ympev.201...
Ämnesord Naidinae Naididae Molecular systematics 12S rDNA 16S rDNA 18S rDNA 28S rDNA COI ITS Character evolution
Ämneskategorier Biologisk systematik, Evolutionsbiologi

Sammanfattning

The phylogenetic relationships within Naidinae (Annelida, Clitellata, Naididae) were investigated, using six molecular markers, both mitochondrial (12S rDNA, 16S rDNA, the COI gene) and nuclear (18S rDNA, 28S rDNA, the ITS region). Thirty-seven nominal species, representing 16 of the 22 genera recognized in the subfamily, were included, and the Nais communis/variabilis species complex was represented by six different morphotypes. Ten other species of Naididae were selected as outgroups. The data were analysed by Bayesian inference and Maximum Likelihood. The phylogeny corroborates monophyly of the Naidinae, and the separate status of the genus Pristina (Pristininae) and the Opistocystinae. Relationships within Naidinae are largely well supported, but in some parts unexpected: (1) A clade containing the largely tropical genera Dero and Branchiodrilus is sister to the rest of the subfamily, and together with a third tropical genus, Allonais, they form a basal paraphyly. All these genera show morphological adaptations to environmental hypoxia, leading to the conclusion that Naidinae originated in tropical freshwaters. (2) The genera Dero, Nais and Piguetiella are paraphyletic. (3) At least Branchiodrilus, Paranais, Chaetogaster, Nais, Stylaria appear to contain cryptic species. Morphological characters, especially those associated with chaetae, are to a great extent homoplastic within Naidinae, which certainly has contributed to the overall taxonomic confusion of this subfamily.

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