Other fragments of the pectoral girdle, such as an interclavicle and clavicles, are also preserved. It also differed from M. bassanii in the construction of its interclavicle. The shoulder girdle is fairly light, with a narrow interclavicle, clavicle, and scapular blade. The interclavicle is hypothesized to be cartilaginous. It consisted of an incomplete basicranium and an incomplete interclavicle, but was destroyed during WW2. The interclavicle is absent in marsupials and placental mammals. The T-shaped interclavicle is similar to Ophiacodon and is well preserved. The simple and oval-shaped interclavicle is bisected by a low ridge and covered in grooves. In the shoulder girdle, the interclavicle was small and T-shaped. The interclavicle, on the other hand, develops through intramembranous ossification of the skin. An interclavicle is a bone which, in most tetrapods, is located between the clavicles. Likewise, the interclavicle was flat and mushroom-shaped, with a long and thin "stem".