Biocca E
Parassitologia. 1980 Dec;22(3):247-55.
The present classification of molluscs, intermediate hosts of Schistosoma in the Mediterranean area (subfamily Bulininae), based on morphological characters of shell, radula teeth and soft anatomy is unsatisfactory. The electrophoretical study of gene-enzyme systems of many strains of different species of genus Bulinus has enabled us in 1979 to split this genus in three well differentiated genera: Bulinus, Physopsis and Isidora (syn. Mandahlbarthia). All the populations of I. truncata at our disposal (from Sardinia, Egypt, Lybia Morocco, etc.) have been genetically studied comparing gene-enzyme systems of each one of them with those of an egyptian reference strain, collected in Giza near Cairo (Egypt). The presence of many genetically well differentiated biotypes has been observed, confirming that Isidora truncata must be regarded as a complex; only in Sardinia have been found 6 genetically differentiated biotypes. The names of the subspecies of Isidora truncata (for instance Isidora truncata, rivularis, etc) have, in our opinion, no taxonomical significance, because it is not possible to identify them morphologically, biologically, serologically, etc. To the contrary the locality of origin of every population of I. truncata complex, followed by the discriminating gene-enzyme systems gives a genetical identification of obvious epidemiological interest.
基于贝壳、齿舌齿及软体解剖学的形态特征，对地中海地区血吸虫中间宿主（泡螺亚科）软体动物的现有分类并不令人满意。对不同种泡螺属许多菌株的基因 - 酶系统进行的电泳研究，使我们在1979年将该属分为三个明显不同的属：泡螺属、拟泡螺属和伊西多拉属（同义词：曼达尔巴尔希亚属）。我们对所掌握的所有截形伊西多拉种群（来自撒丁岛、埃及、利比亚、摩洛哥等）进行了遗传学研究，将它们各自的基因 - 酶系统与从开罗附近吉萨收集的埃及参考菌株的基因 - 酶系统进行比较。已观察到存在许多遗传上明显不同的生物型，这证实截形伊西多拉必须被视为一个复合体；仅在撒丁岛就发现了6种遗传上不同的生物型。我们认为，截形伊西多拉的亚种名称（例如截形伊西多拉、溪流伊西多拉等）没有分类学意义，因为无法从形态学、生物学、血清学等方面对它们进行鉴定。相反，截形伊西多拉复合体每个种群的起源地，再加上有鉴别力的基因 - 酶系统，给出了具有明显流行病学意义的遗传学鉴定。
