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Contents: Redescription of “Orthosternarchus tamandua” (Boulenger, 1898) (Gymnotiformes, Apteronotidae), with reviews of its ecology, electric organ discharges, external morphology, osteology, and phylogenetic affinities; A new species of S. Amer. ghost knifefish (Apteronotidae: “Adontosternarchua”) 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 family Cylindrotomidae (Diptera): newly recorded for Mongolia; Palearctic freshwater mussel (Mollusca: Bivalvia: Unionoida) diversity and the Comparatory Method as a species concept; Decoding Asymmetrics in Reproductive Character Displacement; Studies on the North American Protura I: catalogue and atlas of the Protura of N. Am.; Terrestrial slugs in strip mined and unmined forested land, Tuscarawas County, OH; Epplithic diatoms (Bacillariophyceae) from cloud forest and alpine streams in Bolivia, S. Am.; Fossil catfishes of the families Doradidae and Pimelodidae (Teleostei: Siluriformes) from the Micene 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 “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 regeion (Gryllidae: Eneopterinae). Illus.
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