Skip header and navigation

3 records – page 1 of 1.

Molecular taxonomy and phylogenetic affinities of two groundwater amphipods, Crangonyx islandicus and Crymostygius thingvallensis, endemic to Iceland.

https://arctichealth.org/en/permalink/ahliterature99748
Source
Mol Phylogenet Evol. 2010 Dec 30;
Publication Type
Article
Date
Dec-30-2010
Author
Etienne Kornobis
Snæbjörn Pálsson
Dmitry A Sidorov
John R Holsinger
Bjarni K Kristjánsson
Author Affiliation
Department of Biology, University of Iceland, Askja, Sturlugata 7, 101 Reykjavik, Iceland.
Source
Mol Phylogenet Evol. 2010 Dec 30;
Date
Dec-30-2010
Language
English
Publication Type
Article
Abstract
The amphipod superfamily Crangonyctoidea is distributed exclusively in freshwater habitats worldwide and is characteristic of subterranean habitats. Two members of the family, Crangonyx islandicus and Crymostygius thingvallensis, are endemic to Iceland and were recently discovered in groundwater underneath lava fields. C. islandicus belongs to a well-known genus with representatives both in North America and in Eurasia. C. thingvallensis defines a new family, Crymostygidae. Considering the incongruences observed recently between molecular and morphological taxonomy within subterranean species, we aim to assess the taxonomical status of the two species using molecular data. Additionally, the study contributes to the phylogenetic relationships among several crangonyctoidean species and specifically among species from four genera of the family Crangonyctidae. Given the available data we consider how the two Icelandic species could have colonized Iceland, by comparing geographical origin of the species with the phylogeny. Regions of two nuclear (18S and 28S rRNA) and two mitochondrial genes (16S rRNA and COI) for 20 different species of three families of the Crangonyctoidea were sequenced. Four different methods were used to align the RNA gene sequences and phylogenetic trees were constructed using bayesian and maximum likelihood analysis. The Crangonyctidae monophyly is supported. C. islandicus appeared more closely related to species from the Nearctic region. C. thingvallensis is clearly divergent from the other species of Crangonyctoidea. Crangonyx and Synurella genera are clearly polyphyletic and showed a geographical association, being split into a Nearctic and a Palearctic group. This research confirms that the studied species of Crangonyctidae share a common ancestor, which was probably widespread in the Northern hemisphere well before the break up of Laurasia. The Icelandic species are of particular interest since Iceland emerged after the separation of Eurasia and North America, is geographically isolated and has repeatedly been covered by glaciers during the Ice Age. The close relation between C. islandicus and North American species supports the hypothesis of the Trans-Atlantic land bridge between Greenland and Iceland which might have persisted until 6 million years ago. The status of the family Crymostygidae is supported, whereas C. islandicus might represent a new genus. As commonly observed in subterranean animals, molecular and morphological taxonomy led to different conclusions, probably due to convergent evolution of morphological traits. Our molecular analysis suggests that the family Crangonyctidae needs taxonomic revisions.
PubMed ID
21195201 View in PubMed
Less detail

Preliminary Analysis of Phylogenetic Relationships of the Asian-Pacific Endemial Subterranean Amphipod Genus Pseudocrangonyx Among Families and Genera of Crangonyctoidean Amphipods Inferred by Partial LSU rDNA Gene Sequences.

https://arctichealth.org/en/permalink/ahliterature261265
Source
Zoolog Sci. 2015 Apr;32(2):178-82
Publication Type
Article
Date
Apr-2015
Author
Dmitry A Sidorov
Andrey A Gontcharov
Source
Zoolog Sci. 2015 Apr;32(2):178-82
Date
Apr-2015
Language
English
Publication Type
Article
Abstract
To analyze the phylogenetic relationships of the genus Pseudocrangonyx within the superfamily Crangonyctoidea, we sequenced a partial LSU rDNA gene from four species (six specimens). The monophyly of Pseudocrangonyx and its affinity to Crymostygius were strongly supported by four reconstruction methods: neighbor-joining, minimum evolution, maximum-likelihood, and Bayesian inference. Current geographical distributions of the taxa studied and their phylogenetic relationships established in our study suggest that members of Pseudocrangonyctidae and Crymostygius diverged from a common Crangonyx-like ancestor in the Arctic Basin region of the northern hemisphere.
PubMed ID
25826067 View in PubMed
Less detail

Studies on subterranean amphipod crustaceans of Primory, Russia. Part 1. Three new species of the genus Pseudocrangonyx from springs and other groundwater habitats in far eastern Russia.

https://arctichealth.org/en/permalink/ahliterature265505
Source
Zootaxa. 2013;3693:547-67
Publication Type
Article
Date
2013
Author
Dmitry A Sidorov
Andrey A Gontcharov
Source
Zootaxa. 2013;3693:547-67
Date
2013
Language
English
Publication Type
Article
Keywords
Amphipoda - anatomy & histology - classification - physiology
Animal Distribution - physiology
Animals
Ecosystem
Female
Groundwater
Male
Russia
Species Specificity
Abstract
Three new species of the subterranean amphipod of the genus Pseudocrangonyx: P. tiunovi sp. nov., P. holsingeri sp. nov., P. sympatricus sp. nov. and male specimen for P. kseniae Sidorov, 2012 from the South Primory, Far East of Russia are described. The species were found in springs and related groundwater habitats of several river systems belonging to the Japan Sea basin. Phylogenetic analysis based on mt-cox1 sequences supported the species distinctness. A key for the South Primory species of Pseudocrangonyx is provided.
PubMed ID
26185866 View in PubMed
Less detail