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Y.Alariea
Taxonomic revision and phylogenetic analysis of the genus Oreodytes Seidlitz (COLEOPTERA: DYTISCIDAE: HYDROPORINAE) based on larval morphology.
The Canadian Entomologist, June 1997, Volume 129, Issue 03: 399-503.
Abstract
The larval morphology of the dytiscid genus Oreodytes Seidlitz was investigated
through a detailed analysis of 16 Nearctic and two Palearctic species. Many
structural features, especially those of chaetotaxy and porotaxy of head
capsule, head appendages, legs, last abdominal segment, and urogomphi, were
found to be useful for taxonomic and phylogenetic comparisons. Within the tribe
Hydroporini, it is proposed that Oreodytes shares a monophyletic origin with
the genera Deronectes Sharp, Scarodytes Gozis, Nebrioporus Regimbart, and
Stictotarsus Zimmermann. A tentative phylogenetic reconstruction of the genus
Oreodytes, based on 29 larval characteristics, is provided. The classification
of members of Oreodytes indicated by larvae is shown to be only partly
reconcilable with the one indicated by adults. Once subdivided into three
species-groups, Oreodytes now comprises four species-groups: the O. picturatus,
O. obesus, O. scitulus, and O. quadrimaculatus species-groups. Oreodytes
quadrimaculatus was found to share a monophyletic origin with the members of
the O. picturatus and O. scitulus species-groups. The taxonomic status of the
genus-name Neonectes J. Balfour-Browne is reconsidered as the larvae of N.
natrix (Sharp) and N. babai Sato are revealed to be most similar m
orphologically to members of the O. scitulus species-group.
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