Taxonomic revision of the Afrotropical Agabus raffrayi species group with the description of four new species (Coleoptera, Dytiscidae)

被引:2
|
作者
Englund, William F. [1 ]
Njoroge, Laban [2 ]
Bistrom, Olof [3 ]
Miller, Kelly B. [4 ,5 ]
Bilton, David T. [6 ,7 ]
Bergsten, Johannes [1 ]
机构
[1] Swedish Museum Nat Hist, Dept Zool, Box 50007, SE-10405 Stockholm, Sweden
[2] Natl Museums Kenya, Sect Invertebrate Zool, Museum Hill,POB 40658-00100, Nairobi, Kenya
[3] Univ Helsinki, Zool Unit, Finnish Museum Nat Hist, POB 17, FI-00014 Helsinki, Finland
[4] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA
[5] Univ New Mexico, Museum Southwestern Biol, Albuquerque, NM 87131 USA
[6] Univ Plymouth, Marine Biol & Ecol Res Ctr, Sch Biol & Marine Sci, Plymouth PL4 8AA, Devon, England
[7] Univ Johannesburg, Dept Zool, POB 524, ZA-2006 Johannesburg, South Africa
关键词
Afromontane; diving beetles; freshwater; new species; taxonomy; SOUTH-AFRICA; CAPE; EVOLUTION;
D O I
10.3897/zookeys.963.53470
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
We revise the Afrotropical Agabus raffrayi species group, motivated by the discovery of new diversity in Kenya and South Africa. Whilst Agabus is mainly a holarctic genus, the Agabus raffrayi group is restricted to high altitude regions of eastern Africa and temperate parts of South Africa, from where we describe the southernmost Agabus in the world. The following new species are introduced: Agabus anguluverpus sp. nov. from Mount Kenya in central Kenya, Agabus austellus sp. nov. a widespread species in South Africa, Agabus riberae sp. nov. from the Kamiesberg and northeastern Cederberg ranges in the Northern and Western Cape Provinces of South Africa and Agabus agulhas sp. nov. from the Agulhas Plain, Western Cape Province, South Africa. We provide a distribution map, a determination key for males, quantitative measurements of diagnostic characters, habitus photos and detailed photos of male genitalia for all described species in the group, as well as images of diagnostic characters and habitats. The presence or absence of an elongated section between the subapical broadening and the base of the apical and subapicalteeth of the male aedeagus is a useful novel character, first revealed by our study. In contrast with the most recent revision of Afrotropical Agabus, we show that Agabus ruwenzoricus Guignot, 1936 is restricted to eastern Africa; South African records of this species having been based on misidentifications, no species of the group being common to southern and eastern Africa. We speculate that the raffrayi group may display phylogenetic niche conservatism, being restricted, as an originally temperate taxon, to higher elevations in tropical eastern Africa, but occurring at lower altitudes in temperate South Africa.
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页码:45 / 79
页数:35
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