Molecular phylogeny of the Hydroscaphidae (Coleoptera: Myxophaga) with description of a remarkable new lineage from the Guiana Shield

摘要: The phylogeny of the aquatic beetle family Hydroscaphidae is inferred from one mitochondrial (COI) and five nuclear (18S, 28S, wingless, arginine kinase CAD) genes. Bayesian, maximum likelihood parsimony analyses were conducted on a combined dataset that included representatives all three described hydroscaphid genera, new species uncertain placement, myxophagan families Sphaeriusidae, Torridincolidae Lepiceridae. All strongly supported set nearly identical trees in which (i) monophyly its constituent genera affirmed, (ii) cosmopolitan genus Hydroscapha sister to remaining exclusively Neotropical (iii) new, morphologically aberrant taxa Guiana Shield form monophylum separate any genus. Here, we review each including description Confossa Short, Joly, Garcia & Maddison gen.n. accommodate species: C. sculptura sp.n., C. falcata sp.n. C. minima possesses remarkable perforated abdominal surface hypothesize serves as respiratory plastron. We also present key catalogue family.