The analyses of molecular data represent an effective tool for increasing the credibility of taxonomy and facilitate the description of species. Nevertheless, in haemoprotozoa, the growing amount of available sequential data is not matched by the still limited number of well-defined species. We identified four protistan haemoparasites in North Iranian reptiles: two Hepatozoon and two Schellackia species. Hepatozoon colubri and Hepatozoon ophisauri were morphologically identified in their type hosts, their partial 18S rDNA was analyzed, and thorough literature data were included in their redescription. The scarce data on the detected Schellackia spp. did not allow for their formal species description. Using an integrative approach, including morphological and geographical features, host specificity, molecular data, and the data published thus far, we face the following main difficulties hindering reliable diagnosis. (1) The lack of molecular data on well-described and named species. (2) The insufficiency of using only morphological and biological features, or only sequential data without morphology, to perform an absolutely reliable species diagnosis. (3) Typical morphological features are more substantial than metric means. (4) High risk of synonymy is present in taxonomy of blood Protista. (5) Artefacts caused by blood smear processing further complicate the correct morphological determination.

分子数据分析是提高分类学可信度和促进物种描述的有效工具。然而，在血原动物中，可用的顺序数据数量的增长与有限数量的明确定义的物种不匹配。我们在伊朗北部的爬行动物中鉴定出4种原生动物血寄生虫：两种Hepatozoon和两种Schellackia物种。在它们的类型宿主中在形态学上鉴定了乙型肝炎肝菌和肝型肝炎肝菌，分析了它们的部分18S rDNA，并在其重新描述中包括了详尽的文献资料。检测到的鹅肝中缺乏的数据spp。不允许对其正式物种进行描述。使用综合方法，包括形态和地理特征，宿主特异性，分子数据以及迄今为止发表的数据，我们面临以下阻碍可靠诊断的主要困难。（1）缺乏有关详细描述和命名物种的分子数据。（2）仅使用形态学和生物学特征或仅使用无形态学的顺序数据来进行绝对可靠的物种诊断是不够的。（3）典型的形态特征比度量手段更重要。（4）血液Protista分类法中存在同义的高风险。（5）血液涂片处理引起的伪影进一步使正确的形态学测定变得复杂。