Predaceous Water Beetles (Coleoptera: Adephaga: Dytiscidae, Gyrinidae) Collected Along the Horton and Thelon Rivers in the Arctic Central Barrens of Canada

Predaceous water beetles were collected during expeditions along two northern Canadian rivers during 2000 and 2002. Twelve species of Dytiscidae (including 11 named species and one additional genus identified from a larva) and one species of Gyrinidae are recorded from 20 sites along the Horton and Thelon rivers in the Central Barrens area of the Canadian Arctic. These records represent an extension of the distributions of four species to the northeast in the Northwest Territories (NWT), and two species to the northwest in Nunavut (NU). Oreodytes sanmarkii is reported for NWT and for the mainland of NU for the first time. Ilybius erichsoni, Hydroporus geniculatus, and Gyrinus opacus are reported for NU for the first time. Five species were recorded for the first time from the Southern Arctic ecozone, and one from the Taiga Shield ecozone. The majority of specimens were collected in habitats that were consistent with those previously known for each species

The towering orogeny of New Guinea as a trigger for arthropod megadiversity

Early studies on Melanesian mountain systems provided insights for fundamental evolutionary and ecological concepts. These island-like systems are thought to provide opportunities in the form of newly formed, competition-free niches. Here we show that a hyperdiverse radiation of freshwater arthropods originated in the emerging central New Guinea orogen, out of Australia, about 10 million years ago. Further diversification was mainly allopatric, with repeated more recent colonization of lowlands as they emerged in the form of colliding oceanic island arcs, continental fragments and the Papuan Peninsula, as well as recolonization of the central orogen. We unveil a constant and ongoing process of lineage accumulation while the carrying capacity of the island is about to be reached, suggesting that lineage diversification speed now exceeds that of landmass/new ecological opportunity formation. Therefore, the central orogeny of New Guinea acts as a motor of diversification for the entire region

Hydroporus Foveolatus Heer, 1839 (Insecta, Coleoptera): Proposed Precedence Of The Specific Name Over Hydroporus Nivalis Heer, 1839

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Abstract Five new species of New Guinean Papuadytes Balke are described. Based on distally fused and modified ventral sclerites of the median lobe of the aedeagus, the P. broschii species group is suggested for P. broschii Balke, 1998, P. marinae sp. nov., and P. hintelmannae sp. nov. This group is only known from Papua New Guinea where the species occur allopatrically in different mountain ranges. The other new species are P. atowaso sp. nov., P. munaso sp. nov., and P. vladimiri sp. nov

The towering orogeny of New Guinea as a trigger for arthropod megadiversity

Early studies on Melanesian mountain systems provided insights for fundamental evolutionary and ecological concepts. These island-like systems are thought to provide opportunities in the form of newly formed, competition-free niches. Here we show that a hyperdiverse radiation of freshwater arthropods originated in the emerging central New Guinea orogen, out of Australia, about 10 million years ago. Further diversification was mainly allopatric, with repeated more recent colonization of lowlands as they emerged in the form of colliding oceanic island arcs, continental fragments and the Papuan Peninsula, as well as recolonization of the central orogen. We unveil a constant and ongoing process of lineage accumulation while the carrying capacity of the island is about to be reached, suggesting that lineage diversification speed now exceeds that of landmass/new ecological opportunity formation. Therefore, the central orogeny of New Guinea acts as a motor of diversification for the entire region. © 2014 Macmillan Publishers Limited. All rights reserved.Funding came from Deutsche Forschungsgemeinschaft DFG (BA2152/3-1; 4-1; 7-1; 11-1), the UK DEFRA Darwin Initiative (14054) and the FWF (Fonds zur Förderung der wissenschaftlichen Forschung - the Austrian Science Fund, project P 24312-B17 to H. ShaverdoPeer Reviewe