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MOLECULAR PHYLOGENY OF THE POND SKATERS (GERRINAE), DISCUSSION OF THE FOSSIL RECORD AND A CHECKLIST OF SPECIES ASSIGNED TO THE SUBFAMILY (HEMIPTERA: HETEROPTERA: GERRIDAE)
Affilliation
Botanical Garden and Museum. Laboratory of Molecular Systematics. Copenhagen, Denmark.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Departamento de Zoologia. Laboratório de Entomologia. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
Australian National Insect Collection. CSIRO Entomology. Canberra, Australia.
Natural History Museum Vienna. Entomological Department. Vienna, Austria.
Universidade Federal do Rio de Janeiro. Instituto de Biologia. Departamento de Zoologia. Laboratório de Entomologia. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Rio de Janeiro, RJ, Brasil.
Australian National Insect Collection. CSIRO Entomology. Canberra, Australia.
Natural History Museum Vienna. Entomological Department. Vienna, Austria.
Abstract
The phylogenetic relationships among selected species and genera of Gerrinae (Heteroptera: Gerridae)
were investigated in a parsimony analysis of 2268 bp of DNA sequence data from the genes encoding
COI+II, 16S rRNA and 28S rRNA. The taxa represented 12 of 15 recognized genera of Gerrinae and
with outgroup taxa from all other subfamilies of Gerridae, including three of five recognized genera of
Eotrechinae, which is considered the sister-group of Gerrinae. The resulting phylogeny shows that
Gerrinae is not monophyletic, since a clade comprising Gerris, Aquarius, Limnoporus, Tachygerris,
Eurygerris and Gigantometra is more closely related to representatives of the subfamily Eotrechinae than
to a clade comprising Limnogonus, Neogerris, Limnometra, Tenagogerris and Tenagogonus. The two
currently recognized gerrine tribes, Tachygerrini and Gerrini, were also paraphyletic, since Eurygerris was
sister-group to Gigantometra, while Tachygerris was sister-group to Limnoporus + Aquarius + Gerris.
Limnogonus and Neogerris were found to be strongly supported sister-taxa, and their sister-group was a
clade comprising Limnometra, Tenagogerris and Tenagogonus, none of which were monophyletic. Finally,
Aquarius chilensis (Berg, 1881) was sister-group to a clade comprising Aquarius amplus (Drake & Harris,
1938), A. remigis (Say, 1832) and A. remigoides (Gallant & Fairbairn, 1993), recognized as the A. remigis
species group, and the entire clade was sister-group to Gerris. Based on the phylogenetic reconstruction,
we outline possible diagnostic character combinations for a future revision of the Gerrinae and discuss the
fossil record. While some of the relationships reinstate earlier ideas, e.g., Limnogonus and Neogerris being
sister groups, many others are poorly supported and poorly diagnosed, and therefore, we retain from
drawing taxonomic conclusions until data is available from the remaining genera, which can support a
future generic revision of the Gerrinae. The updated checklist of species assigned to the subfamily is therefore
based on the established taxonomy.
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