Abstract A new species of nematode parasite the subfamily Pudicinae (Heligmosomoidea: Heligmonellidae) is described from small intestine Proechimys simonsi (Rodentia: Echimyidae) locality Nova Cintra in municpality Rodrigues Alves, Acre state, Brazil. The genus Pudica includes 15 parasites Neotropical rodents families Caviidae, Ctenomyidae, Dasyproctidae, Echimyidae, Erethizontidae, and Myocast...

Three new species of the genus Stigmaeus Koch, 1836 (Acari: Stigmaeidae) are described from various habitats in Crimea: Stigmaeus kuznetsovi sp. nov. from nests of Microtus socialis (Rodentia: Cricetidae); S. mitrofanovi sp. nov. from galleries of Pityogenes bistridentatus (Coleoptera: Curculionidae) under the bark of Pinus pallasiana, and S. silvestris sp. nov. from rotten log of Pinus pallasi...

Both sexes of a new species of sucking louse Hoplopleura janzeni (Phthiraptera: Hoplopleuridae) are described and illustrated from the Central American ichthyomyine swimming mouse Rheomys raptor (Rodentia: Muridae) collected in Costa Rica. The morphology of the new species is compared with that of Hoplopleura exima Johnson, the only other species of sucking louse known to parasitize an ichthyom...

A number of phylogenetic studies have been performed on the family Sciuridae. This work seeks to validate and extend existing phylogenetic studies of Sciuridae with an analysis of the divergence times of a selected set of species. A total of five genes; 2 mitochrontrial ribosomal RNA genes (12S, 16S), a mitochrontrial protein coding gene (cytb) and two nuclear genes (IRBP, RAG1) were studied ac...

By using DNA sequences of 17 mammalian genes, the generation-time effect is estimated separately for synonymous substitutions and nonsynonymous substitutions. Star phylogenies composed of rodentia, artiodactyla, and primates are examined. The generation-time effect is found to be more conspicuous for synonymous substitutions than for non-synonymous substitutions, by using the methods of (i) Nei...

Social Behavior of Captive Black-Tailed Prairie Dogs (Mammalia, Rodentia) with Changing Numbers of Observers. Eltorai A. E. M., Sussman R. W. – Black-tailed prairie dogs Cynomys ludovicianus (Ord, 1815) are diurnal rodents that live in intricate cities. Their social complexity rivals that of some primates, and, in some respects, resembles the behavior of humans. Due to the rich variety of readi...

For the elucidation of the phylogenetic position of insectivora in eutheria, we have sequenced the cytochrome c oxidase subunit II (COII) gene of mitochondria for three insectivoran species [musk screw (Suncus murinus), shrew mole (Urotrichus talpoides), Japanese mole (Mogera wogura)] and analyzed these amino acid sequences with neighbor-joining (NJ) method and maximum likelihood (ML) method. N...