title: Description of two new actinosporean types from a brook of Fuji Mountain, Honshu, and from Chitose River, Hokkaido, Japan.
abstract: Actinospore infection of oligochaetes living in the mud of 3 freshwater biotopes in Japan was studied. Using the cell-well plate method, a new aurantiactinomyxon type was found in 0.77% of the examined Tubifex tubifex oligochaete specimens from a brook near Yamanashi Prefectural Fisheries Experimental Station on Fuji Mountain. In 0.14% of Lumbriculus variagetus collected from Chitose River, near Chitose Salmon Hatchery, a new siedleckiella type was found, while at the same time 8.1% of the Lumbriculus spp. oligochaetes released triactinomyxons of Myxobolus arcticus. Of the examined Rhyacodrilus komarovi oligochaetes collected from the Mena River system, Hokkaido, 0.2, 0.6, 0.5 and 0.8% were infected with echinactinomyxon, neoactinomyxum and 2 types of triactinomyxon spores, respectively, and described in our previous paper. The oligochaetes released actinospores for several weeks. Actinospore infection showed high intensity in positive oligochaetes in the case of all the actinosporean types. Two of the actinospore types (aurantiactinomyxon and siedleckiella) presented here have not been previously described.
authors.affiliation: Veterinary Medical Research Institute, Hungarian Academy of Sciences, Hungaria krt. 21, 1143 Budapest, Hungary. szekely@vmri.hu
authors.forename: Csaba
authors.initials: C
authors.lastname: Székely
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yokoyama
authors.forename: Shigehiko
authors.initials: S
authors.lastname: Urawa
authors.forename: Tarmo
authors.initials: T
authors.lastname: Timm
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ogawa
mesh_terms: D000818:Animals; D017756:Aquaculture; D056890:Eukaryota / Q000145:classification* / Q000302:isolation & purification; D005393:Fish Diseases / Q000469:parasitology; D019015:Geologic Sediments / Q000469:parasitology; D007564:Japan; D009835:Oligochaeta / Q000469:parasitology*; D017683:Oncorhynchus / Q000469:parasitology; D010802:Phylogeny; D011529:Protozoan Infections, Animal / Q000469:parasitology; D033761:Spores, Protozoan / Q000302:isolation & purification