Topic
Brychius elevatus
About: Brychius elevatus is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 9 citations.
Papers
TL;DR: The Nearctic species of Brychius Thomson, 1859 (Coleoptera: Haliplidae) were revised by examining adult and larval specimens, finding that vicariance has played an important role in the present distribution, where species were once widespread in cool mountainous glacial streams, then became restricted to geographically isolated regions with the retreat of the glaciers and the extinction of intervening populations.
Abstract: The Nearctic species of Brychius Thomson, 1859 (Coleoptera: Haliplidae) were revised by examining adult and larval specimens. Brychius albertanus Carr 1928 is a junior subjective synonym of Brychius hornii Crotch 1873. Descriptions of adults and larvae (excluding B. pacificus), distribution data, and a key to adults are provided for all Nearctic species. From a reconstructed phylogeny of all species of Brychius, B. hornii + B. hungerfordi is the sister-group to Brychius elevatus Panzer 1794 + Brychius glabratus Villa 1833; and these combined are the sister group to Brychius pacificus Carr, 1928. Species of Brychius are hypothesized to have arisen and diversified on Laurasia during the Jurassic Period. Brychius hornii and B. hungerfordi originated in the Tertiary Period before the formation of the Rocky Mountains, ca. 50 to 100 million years ago. It is thought that vicariance has played an important role in the present distribution, where species were once widespread in cool mountainous glacial st...
6 citations
30 Jun 2006
TL;DR: It is suggested that the X0 sex chromosome system, the most common in the Adephaga, is plesiotypic for Haliplidae, and that the XY systems are a synapomorphy of the family, and are neo-XY in origin.
Abstract: The karyotypes of 15 European species of Haliplidae are described and illustrated. The sex chromosomes are X0 in Brychius elevatus and Peltodytes caesus, and XY in 13 species of Haliplus . The number of autosome pairs is 16 in Peltodytes caesus , 19 in Brychius elevatus , 17 in Haliplus (Liaphlus) fulvus, 15 in H. (L.) variegatus , 14 in H. (L.) flavicollis , 11 in H. (L.) laminatus , 9 in H. (L.) mucronatus , and 11 in H. (Haliplidius) obliquus and H. (H.) confinis , H. (Neohaliplus) lineatocollis and five species of H. (Haliplus). It is suggested that the X0 sex chromosome system, the most common in the Adephaga, is plesiotypic for Haliplidae, and that the XY systems are a synapomorphy of the family, and are neo-XY in origin. There is no good evidence of Xyp systems of the type found in Polyphaga. The diversity of karyotypes shown by species of the subgenus Liaphlus is contrasted with the near uniformity shown by other groups. Interspecific differences between karyotypes are noted.
3 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2007 | 1 |
| 2006 | 1 |