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In the stem-derivational perfective-imperfective opposition of Slavic the role of prefixes and suffixes has to be assessed jointly. The article evaluates the diachronic backdrop and parameters appropriate for classificatory categories. Special attention is paid to the criteria applied by aspectologists to determine aspect pairs and to aspect triplets. The assessment ends up with a paradox resulting from Maslov's criteria of 'trivial pairednessʼ, which require not only identical lexical meaning, but an ontology for which telic events are the sole basis in the derivation of aspect pairs.

Species. --- Classification.

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"The Neotropical lycaenid hairstreak genus Paraspiculatus is unusual because of a high frequency of sympatry in the Upper Amazon Basin coupled with negligible interspecific variation of male genitalic structures and absence of male secondary sexual traits. Male sexual structures are postulated to promote species recognition by females and to contribute to reproductive isolation, for which reason a high incidence of sympatry in Paraspiculatus would not be expected. A revision of Paraspiculatus was feasible because we increased the number of study specimens more than five-fold (by the extensive use of rotting fish as a bait for males) and sequenced the "barcode" part of the mitochondrial gene CO1 for almost all species. We recognize 19 Paraspiculatus species based on male wing patterns, of which ten are newly described and registered with ZooBank. We partition the 19 species into ten species complexes, which are monophyletic in all analyses of morphological characters, CO1 sequences, and a combined dataset. Male Paraspiculatus are attracted to traps baited with rotting fish in eastern Ecuador, but elsewhere this attraction is less frequent or absent. Using the behavior of other eumaeines as context, we briefly discuss these observations with respect to Paraspiculatus biology. Ten of 19 Paraspiculatus species are sympatric in the Upper Amazon Basin below 1,250 m. Five of these sympatric species are from a single species complex. This instance of apparent in situ diversification is responsible for much of the sympatric diversity in Paraspiculatus in the Upper Amazon Basin."--Provided by publisher.

Paraspiculatus --- Coexistence of species

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Alabama Wildlife, Volume 5 offers a comprehensive update and provides a wealth of new information concerning changes and developments relative to the conservation status of wild animal populations of the state that have occurred in the decade since publication of the previous four volumes in 2004. Enhancements include the addition of any new or rediscovered taxon, species priority status changes, and taxonomic changes, plus the addition of the crayfishes, which were left out previously because so little was known about these understudied taxa. A complete taxonomic checklist is included, which lists each imperiled taxon along with its priority designation followed by detailed species accounts. The eighty-four crayfish species accounts are comprised of a physical description (including a photograph, when available), distribution map, habitat summary, key life history, ecological information, basis for its status classification, and specific conservation and management recommendations. This revised expansion of the Alabama Wildlife set will be helpful to those seeking to broaden their knowledge of Alabama's vast wildlife resources and will greatly influence future studies in the conservation of many of the imperiled species. The University of Alabama Press originally released a set of four volumes titled Alabama Wildlife in 2004. The series consisted of A Checklist of Vertebrates and Selected Invertebrates (Volume 1), Imperiled Aquatic Mollusks and Fishes (Volume 2), Imperiled Amphibians, Reptiles, Birds, and Mammals (Volume 3), and Conservation and Management Recommendations for Imperiled Wildlife (Volume 4). However, Alabama Wildlife, Volume 5 offers an all-inclusive and complete update of these four previously published volumes, making it the single resource required for all those working with or interested in Alabama's wild animals.

Vertebrates --- Endangered species --- Vertebrata --- Chordata --- Endangered animal species --- Endangered animals --- Endangered wildlife --- Threatened animal species --- Threatened animals --- Threatened species --- Threatened wildlife --- Vanishing species --- Vanishing wildlife --- Wildlife, Endangered --- Wildlife, Threatened --- Wildlife, Vanishing --- Species --- Wildlife conservation --- Rare animals

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Bull trout --- Endangered species --- Wildlife recovery --- Conservation

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Paraspiculatus --- Coexistence of species --- Amazon River Watershed.