Institute for Experimental Pathology at Keldur, University of Iceland, Reykjavik, Iceland.
J Invertebr Pathol. 2011 Nov;108(3):147-55. doi: 10.1016/j.jip.2011.08.003. Epub 2011 Aug 27.
Examination of three scallop species from three separate locations: Iceland scallop from Icelandic waters, king scallop from Scottish waters and queen scallop from Faroese and Scottish waters, revealed infections of a previously unknown apicomplexan parasite in all three scallop species. Developmental forms observed in the shells appeared to include both sexual and asexual stages of the parasite, i.e. merogony, gametogony and sporogony, which suggests a monoxenous life cycle. Meronts, gamonts, zygotes and mature oocysts were solely found in the muscular tissue. Zoites, which could be sporozoites and/or merozoites, were observed in great numbers, most frequently in muscles, both intracellular and free in the extracellular space. Zoites were also common inside haemocytes. Examination of the ultrastructure showed that the zoites contained all the major structures characterizing apicomplexans. This apicomplexan parasite is morphologically different from other apicomplexan species previously described from bivalves. Presently, its systematic position within the phylum Apicomplexa cannot be ascertained.
对来自三个不同地点的三种扇贝物种（冰岛扇贝来自冰岛水域、海湾扇贝来自苏格兰水域、女王扇贝来自法罗群岛和苏格兰水域）进行检查，结果在所有三种扇贝物种中都发现了一种以前未知的顶复门寄生虫感染。在贝壳中观察到的发育形式似乎包括寄生虫的有性和无性阶段，即裂殖生殖、配子生殖和孢子生殖，这表明其是单宿主生活史。裂殖体、配子体、合子和成熟卵囊仅存在于肌肉组织中。大量的裂殖体（可能是裂殖子和/或滋养体）被观察到，最常见于肌肉组织中，无论是在细胞内还是在细胞外空间中自由存在。裂殖体在血球中也很常见。超微结构检查表明，裂殖体包含了所有顶复门寄生虫的主要结构。这种顶复门寄生虫在形态上与以前在双壳类动物中描述的其他顶复门寄生虫物种不同。目前，它在顶复门门内的系统位置尚无法确定。
