Thecamoeba astrologa n. sp. was isolated from a plant litter sample. This species has a complex locomotive morphology, to a certain extent intermediate between the striate and the rugose morphotype. The shape of the actively moving cell is similar to that of striate thecamoebians, such as T. quadrilineata. However, in a slow movement, they can be easily confused with rugose species, like T. similis. Thecamoeba astrologa normally has peripheral asterisk-like nucleoli, which are unique among known thecamoebids. However, the structure of the nucleus is unusually variable during the growth of the culture and in some cases may become almost a vesicular one. The phylogenetic analysis based on the 18S rRNA gene sequence shows that this species belongs to the clade of thecamoebids, consisting of species possessing vesicular nuclei. This finding indicates that the structure of the nucleus derived from a single or few observations (as it usually happens in faunistic or ecological studies) may not be a reliable character of a thecamoebid amoeba. In some species nuclei may be highly polymorphic and dominating nuclear structure may depend on the age of the culture. Nuclei with constantly or temporarily peripheral nucleoli are now known in both major phylogenetic branches of the genus Thecamoeba.

Thecamoeba astrologa n. sp. 是从植物凋落物样品中分离出来的。该物种具有复杂的机车形态，在一定程度上介于条纹和皱纹形态类型之间。主动移动的细胞的形状类似于条纹毛虫的形状，例如T. quadrilineata。然而，在缓慢的运动中，它们很容易与有皱纹的物种混淆，如T. similis。卡米巴占星术通常具有外围星号状核仁，这在已知的thecamoebids 中是独一无二的。然而，细胞核的结构在培养物的生长过程中是异常变化的，在某些情况下可能几乎变成一个囊泡。基于18S rRNA基因序列的系统发育分析表明，该物种属于camoebids进化枝，由具有囊泡核的物种组成。这一发现表明，从单个或少数观察得出的细胞核结构（正如在动物学或生态学研究中通常发生的那样）可能不是变形虫阿米巴的可靠特征。在某些物种中，细胞核可能是高度多态的，主要的细胞核结构可能取决于培养物的年龄。卡米巴原虫。