New Trematodes from Tasmanian Fishes (Order, Digenea. Family, Allocreadiidae)

Little is known concerning the trematode parasites of Tasmanian fishes. A single species CoitocaecU11'l anas}Jiclis Hickman has been described from pl'ogenetic metacercariae in the Mountain Shrimp, A.nas}Jides tawmaniae Thompson. Members of the genus Coitocaec/Ii/n usually complete their life cycle in a fish. The present paper discusses the status of species belonging to the genus, and describes a new species, Coitocaecum }Jet)'vurn, from specimens of the freshwater fishes, GaZa,a,ias at.tenuatlls J enyns, and Pscucla,ph)'itis 1i1"villii (Cuv, and Val.) , caught in a brackish creek neal' the Bowen Monument at East Risdon. In addition to the above, a new trematode from the purple banded parrot fish, Pseuclolabrl,ls tetricLl8 Rich., is described. The species forms the type of a new genus, and the name Gno.thmnyzon insolens gen. et sp.n. is proposed. FOl'whole mounts specimens were fixed in 90(~ alcohol under slight covel'-glass preO'sure, and stained in borax-carmine or Ehrlich's haematoxylin. For sectioning specimens were fixed in Bouin's solution and the sections were stained in Ehrlich's haematoxylin.