Further studies on Boreonectes Angus, 2010, with a molecular phylogeny of the Palaearctic species of the genus

Abstract

Karyotypes are given for Boreonectes emmerichi (Falkenström, 1936) from its type locality at Kangding, China, and for B. alpestris (Dutton & Angus, 2007) from the St Gotthard and San Bernardino passes in the Swiss Alps. A phylogeny based on sequence data from a combination of mitochondrial and nuclear genes recovered western Palaearctic species of Boreonectes as monophyletic with strong support. Boreonectes emmerichi was placed as sister to the north American forms of B. griseostriatus (De Geer, 1774), although with low support. The diversity of Palaearctic species of the B. griseostriatus species group is discussed.

A re-examination of the West European species of Boreonectes Angus, 2010, with particular reference to B. multilineatus (Falkenström, 1922) (Coleoptera, Dytiscidae)

“… multilineatus are given by Foster et al (2016) . The only other records for this species are from the Faroe Islands, the material in this case being identified by DNA analysis ( Angus et al 2017 ). Irish B.…”

“… alpestris e paratype ♂, Italy, Dolomites, Falcade, shown as fig. 2f by Dutton and Angus (2007) f, g ♂, Italy, Gran Paradiso, Colle del Nivolet e plain f C-banded, shown as fig.1b, c by Angus et al (2017) h, i ♀, Switzerland, Ticino, San Bernardino pass h plain i C-banded, shown as fig. 1d, e by Angus et al (2017) j paratype ♀, Switzerland, Ticino, Medeglia, plain, shown as fig.…”

“…The West European species of Boreonectes show a striking diversity of karyotypes, in sharp contrast to their genetic (DNA) differences which are very slight ( Angus et al 2017 ). The two studied southeast European species ( B.…”

“…The West European species of Boreonectes show a striking diversity of karyotypes, in sharp contrast to their genetic (DNA) differences which are very slight (Angus et al 2017). The two studied southeast European species (B. macedonicus (Georgiev, 1959) and B. riberae (Dutton et Angus, 2007)) are slightly more distant genetically and the Tibetan B. emmerichi (Falkenström, 1936) much more so, in fact closer to American "griseostriatus", although its karyotype is very similar to that of B. macedonicus (Angus et al 2015).…”