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Contents: Redescription of “Orthosternachus tamandua” (Boulenger, 1898) (Gymnotiformes, Apteronotidae), with reviews of its ecology, electric organ discharges, external morphology, osteology, and phylogenetic affinities; A new species of S. Am. ghost knifefish (Apteronotidae: “Adontosternarchus”) from the Amazon Basin; Discovery of African roots for the Mesoamerican Chiapas catfish, “Lacantunia enigmatica,” requires an ancient intercontinental passage; Changes and additions to the N. Am. lichen Mycota - VI; The crane fly family Cylindrotomidae (Diptera): newly recorded for Mongolia; Palearctic freshwater mussel (Mollusca: Bivalvia: Unionoida) diversity and the Comparatory Method as a species concept; Decoding Asymmetries in Reproductive Character Displacement; Studies on the N. Am. Protura 1: catalogue and atlas of the Protura of N. Am., description of new species, key to the species of Eosentomon; Terrestrial slugs in strip mined and unmined forested land, Tuscarawas County, Ohio; Epilithic diatoms (Bacillariophyceae) from cloud forest and alpine streams in Bolivia, S. Am.; Fossil catfishes of the families Doradidae and Pimelodidae (Teleostei: Siluriformes) from the Miocene Urumaco Formation of Venezuela; First phantom crane flies (Diptera, Ptychopteridae) from Baltic Amber (Eocene); Tetrapod tracks from the Mauch Chunk Formation (middle to upper Mississippian) of Pennsylvania; Reassessment of the phylogenetic relationships among “Anondonta,” “Pyganodon,” and “Utterbackia” (Bivalvia: Unionoida) using mutation coding of allozyme data; New cricket species from the Fiji Islands (Orthoptera: Grylloidea); “Mexitettix” and “Mexacris,” two new genera of grasshoppers from eastern Mexico (Acrididae: Melanoplinae); New species of “Cardiodactylus” from the western Pacific region (Gryllidae: Encopterinae). Illus.
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