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Genus Ichthyomyzon Girard
Methods of Counting and Measuring and an Evaluation of the Characters
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1)—Michigan Acad adult Ammocoetes concolor averaging bdellium bicolored bicuspid circumorals blackened branchial region Bull castaneus characters circumoral row counted Creaser and Hubbs Creek cuspis cusps Cusps Fig degenerate disk teeth dorsal fin drainage basin Entosphenus Evermann Fish Comm Forbes and Richardson Girard Grant Parish greeleyi hirudo Hist holotype Huron identification Illinois Indiana infraoral cusps Jordan and Gilbert Kirtland Lake Erie Lake Michigan Lake Pepin lamottenii Lampetra lampreys lateral line lateral rows Length of disk Length of eye Length of snout Mississippi River myomeres Neshannock Creek nonparasitic species Ohio River parasitic species paratypes Petromyzon argenteus Petromyzon marinus pigmented range re-examined Reighard Rept River system Row Fig Saint Lawrence River slightly higher spawning species of Ichthyomyzon specimens supraoral cusps synonym synonymy Table teeth in lateral thousandths of total tooth transverse lingual lamina tributary unicolor unicuspis unicuspis and castaneus unicuspis and fossor usually vertebrate Wisconsin Zool