Morphology and life cycle of Apatemon hypseleotris species novum from Australia including metacercariae viability and excystment.
Experimental infection of pigeon squabs and rats with encysted metacercariae from the Western Carp gudgeon (Hypseleotris klunzingeri) showed them to be infected with a new strigeid trematode, Apatemon hypseleotris. Growth and development of A. hypseleotris in pigeons were significantly higher than in rats. Eggs appeared in pigeon faeces within 7-14 days; miracidia hatched within 15-21 days and in the snail Lymnaea tomentosa released within 21 days. Cercariae experimentally encysted in the leeches Helobdella papillornata (86.7%) and Alboglossiphonia australiensis (73.3%). In fish, encystation occurred in the abdominal cavity (100%) and muscles (40%) of Hypseleotris klunzingeri, in the abdominal cavity (80%) and head (30%) of Gambusia affinis and in the abdominal cavity (62.5%) of Oncorhynchus mykiss but no encystation occurred in Moenkhausia pittieri. Freezing (-7 degrees C for 3-7 days or -21 degrees C for 8-12 hours), chilling (6 degrees C for 12 days), boiling (3 minutes) or salting for 3-5 days of encysted metacercariae did not significantly reduce infectivity. In vitro excystation of metacercariae was achieved using pepsin followed by trypsin and/or bile salts.
Negm-Eldin
M
M
Benha University, Department of Parasitology, Faculty of Vet. Med., Tukh Moushtohour, Egypt.
Davies
R W
RW
D000818:Animals; D001315:Australia / Q000453:epidemiology; D010856:Columbidae; D005243:Feces / Q000469:parasitology; D005393:Fish Diseases / Q000453:epidemiology / Q000469:parasitology*; D007421:Intestine, Small / Q000469:parasitology; D007865:Leeches / Q000469:parasitology; D008018:Life Cycle Stages; D008195:Lymnaea / Q000469:parasitology; D010473:Perciformes / Q000469:parasitology*; D015995:Prevalence; D051381:Rats; D013045:Species Specificity; D014200:Trematoda / Q000033:anatomy & histology / Q000254:growth & development* / Q000502:physiology; D014201:Trematode Infections / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*