NEW STATE, HOST, AND DISTRIBUTION RECORDS OF THE FISH ECTOPARASITE, ARGULUS (BRANCHIURA), FROM ILLINOIS (USA)

Argulus americanus, A. flavescens, A. lepidostei, and A. japonicus are reported from Illinois for the first time. Gizzard shad (Dorosoma cep edianum) is a new host record for A. japonicus, bigmouth buffalo (Icti obus cyprinellus) is a new host record for A. catostomi, and black cra ppie (Pomoxis nigromaculatus) is a new host record for A. stizostethii . Eight species, A. americanus, A. appendiculosus, A. catostomi, A. fl avescens, A. japonicus, A. lepidostei, A. mississippiensis, and A. sti zostethii, have been recorded from 13 Illinois fish species. Ciliated protozoans (Epistylis or Opercularia) were observed on four Argulus sp p., and crustacean shell disease was observed on five species.