Lankesterella corvi n. sp., a Blood Parasite of the English Rook, Corvus f. frugilegus L.*

摘要: SYNOPSIS. Lankesterella corvi n. sp. (Coccidia, Eimeriidae, Cryptosporidiinae) is described from the rook, Corvus f. frugilegus L. in England. It was found 36 of 196 fledged rooks less than 1-year old, but not 25 nestlings or 38 adults. 71 jackdaws (C. monedula spermologus) 110 other birds 16 species. Mature sporozoites were erythrocytes and occasionally blood cells. They 6.2 times 2.5 μ, with a central, band-like nucleus, cytoplasm which failed to stain Giemsa's stain. Gametogonic sporogonic stages, bone-marrow one bird, resembled corresponding stages Eimeria. A fledgling rook infected experimentally by inoculation tissue suspension an bird. Sporozoites appeared its 4 days after inoculation. increase slightly size their lost initial affinity for during next few days. Engorged mites (Ornithonyssus sylviarum) rock contained unchanged no developmental parasite. A canary could be intraperitoneal feeding such mites.