Desser S S, Bower S M
Department of Zoology, University of Toronto, Ontario, Canada.
Folia Parasitol (Praha). 1997;44(4):241-7.
Two of 98 native littleneck clams, Protothaca staminea Conrad, from Cooper's Cove, Sooke Basin were infected with an eimeriorin coccidian parasite. Merogonic gamontogonic and sporogonic development were observed in renal tubular epithelial cells. Sporulation of the oocysts occurred within the host. Mature oocysts were spherical mean 41 microns (range 30-44), and contained about 32 subspherical sporocysts (9 x 10 microns), each of which contained 4 sporozoites. Spherical 19 microns (18-20), cyst-like structures and smaller multinucleate bodies, some of which resembled sporocysts, were also seen. A review of the coccidian parasites of bivalves led to the erection of the new genus, Margolisiella (family Eimeriidae Minchin, 1903) to accommodate M. kabatai sp. n., the parasite in Protothaca staminea described herein. Four previously described monoxenous species (Pseudoklossia patellae Debaisieux, P. chitonis Debaisieux, P. tellinovum Buchanan and P. haliotis Friedman, Gardner, Hedrick, Stephenson, Cawthorn et Upton) were also transferred to the new genus. The 2 remaining possibly heteroxenous species (P. pelseneeri Léger and P. glomerata Léger et Duboscq) were retained in the genus Pseudoklossia Léger et Duboscq (family Aggregatidae Labbé, 1899).
从苏克盆地库珀湾采集的98只本地细纹蚶（Protothaca staminea Conrad）中有两只感染了艾美耳球虫寄生虫。在肾小管上皮细胞中观察到了裂殖生殖、配子生殖和孢子生殖发育过程。卵囊在宿主体内发生孢子化。成熟卵囊呈球形，平均直径41微米（范围为30 - 44微米），包含约32个亚球形孢子囊（9×10微米），每个孢子囊含有4个子孢子。还观察到了直径19微米（18 - 20微米）的球形、囊状结构以及较小的多核体，其中一些类似孢子囊。对双壳贝类球虫寄生虫的综述促使建立了新属Margolisiella（艾美耳科，Minchin，1903），以容纳本文描述的细纹蚶中的寄生虫M. kabatai sp. n.。之前描述的四个单宿主物种（Pseudoklossia patellae Debaisieux、P. chitonis Debaisieux、P. tellinovum Buchanan和P. haliotis Friedman、Gardner、Hedrick、Stephenson、Cawthorn及Upton）也被转移到了这个新属。另外两个可能是多宿主的物种（P. pelseneeri Léger和P. glomerata Léger及Duboscq）仍保留在Pseudoklossia Léger及Duboscq属（聚集科，Labbé，1899）中。
