期刊
JOURNAL OF PARASITOLOGY
卷 106, 期 3, 页码 350-359出版社
ALLEN PRESS INC
DOI: 10.1645/19-162
关键词
Bivalvulida; Cyprinella; Cypriniformes; Cyprinidae; Histology; Myxobolidae; Pathology; Phylogeny; Taxonomy; Thelohanellus
类别
资金
- Alabama Department of Conservation
- Alabama Agricultural Research Station
- Georgia Department of Conservation and Natural Resources
- North Carolina Wildlife Resources Commission
- United States Fish and Wildlife Service
- United States Gulf States Marine Fisheries Commission Aquatic Nuisance Species Program
Thelohanellus magnacysta n. sp. (Bivalvulida: Myxobolidae) infects the skeletal muscle of blacktail shiner, Cyprinella venusta Girard, 1856 (Cypriniformes: Cyprinidae) in Bull Creek, Chattahoochee River Basin, eastern Georgia. Although numerous members of Thelohanellus Kudo, 1933 have overlapping myxospore dimensions with the new species, it differs from all nominal congeners by polar filament coil number and polar capsule width as well as by lacking a mucous envelope, iodinophilic vacuole, and sutural markings. With the use of novel primers for Myxozoa, a phylogenetic analysis of the small subunit ribosomal DNA (SSU rDNA) suggests that the new species shares a recent common ancestor with a Glade of cyprinid-infecting species of Myxobolus Biltschli, 1882 (Bivalvulida: Myxobolidae) and Thelohanellus. Consistent with other published research concerning the systematics of Thelohanellus, this result suggested that Thelohanellus and Myxobolus are polyphyletic and need revision. Histological sections of infected blacktail shiners confirmed that myxospores were only found within a plasmodium and only infected skeletal muscle and that plasmodia were encapsulated by a granuloma comprising varying degrees of acute granulomatous inflammation. The new species is the fourth of Thelohanellus reported from North America and the first reported from Cyprinella, as well as the first myxozoan described from the blacktail shiner.
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