PROTEROMETRA AUTRAINI N-SP (DIGENEA, AZYGIIDAE) FROM MICHIGANS UPPER PENINSULA AND A KEY TO SPECIES OF PROTEROMETRA

Life stages of Proterometra autraini n. sp. (Digenea: Azygiidae) from the Au Train River, Au Train, Michigan are described, with emphasis on the cercarial stage. Progenetic cercariae develop in rediae in the sn ail Elimia livescens and emerge seasonally from mid-summer to mid-autu mn. Cercariae emerge naturally between 1000 and 2100 hr EDT. Adults we re retrieved from several naturally infected fish species. Specimens o f Coitus bairdi (n = 16) displayed the greatest prevalence (75%), mean intensity (7.1), and abundance (5.3) of infection. Experimental infec tions were successful in C. bairdi, Lepomis macrochirus, and Perca fla vescens. The geographical range of this parasite is limited to the por tion of the Au Train River between Au Train Lake and Lake Superior.