The width of the body proper exhibits a noticeable variation in that it is wider towards the anterior end and tapers towards the posterior end. When it comes to the posterior spines, they display a degree of inequality in length. Specifically, the left spine is shorter than the right one in the majority of cases. However, there are instances where the left spine is completely absent, even when the right spine is well-developed. Furthermore, in some situations, both posterior spines are entirely absent. It is important to note that these spines can have varying lengths, contributing to the diversity observed in this characteristic. This variability in the width of the body and the presence and length of the posterior spines highlights the range of morphological features within this species.