Jourdane J
Ann Parasitol Hum Comp. 1976 Jul-Aug;51(4):421-32.
Pseudoleucochloridium soricis develops to the sporocyst stage in the digestive gland of the terrestrial Pulmonate Cepaea hortensis. The cercaria, microcercous in type, is liberated and actively penetrates a second terrestrial pulmonate where development to the free metacercarial stage takes place in the pericardial cavity. Ecologically, the cycle of P. soricis in the Pyrenees, exhibits two characteristics which require particular attention: --the transmission of the parasite to the second host, which, although experimentally possible, and with equal success, in two species of Helicide (C. hortensis and Euomphalia strigella) occurs in the wild preferentially in E. strigella. The differing trophic behaviour of the two molluscs is thought to be the factor responsible for this selection;--the level of infection in shrews appears to be extremely low (never more than 1%) in all sampling areas, a character which contraste with the persistantly high level of infection in the second host (at least 50%). This epidemiological character points to the probable evolution of P. soricis in a definitive host (almost certainly a Bird) which has not yet been discovered.
伪嗜酸性粒细胞梨形虫在陆生肺螺科的庭园蜗牛的消化腺中发育到孢蚴阶段。尾蚴为微尾型，逸出后主动侵入另一种陆生肺螺，在其心包腔中发育到游离后尾蚴阶段。在生态方面，比利牛斯山脉的伪嗜酸性粒细胞梨形虫循环表现出两个需要特别关注的特征：——寄生虫向第二宿主的传播，尽管在实验中两种扁卷螺（庭园蜗牛和细纹真肺螺）都有可能且成功率相同，但在野外优先发生在细纹真肺螺中。两种软体动物不同的摄食行为被认为是造成这种选择的因素；——在所有采样区域，鼩鼱的感染率似乎极低（从不超过1%），这一特征与第二宿主持续的高感染率（至少50%）形成对比。这种流行病学特征表明伪嗜酸性粒细胞梨形虫可能在一个尚未被发现的终末宿主（几乎肯定是一种鸟类）中进化。
