- The mandibles are usually lost, the labrum is reduced to a narrow transverse sclerite, and the labium is a small flap ( though its palps retain quite large).
- The kind of the sclerite base preservation,usually as phosphatic steinkern,shows that it is easier to be phosphatized than the mineralized sclerite wall,which suggests that the base is histologically different from the latter.
骨片的基部通常保存为磷质内核 ,表明它比骨片壁更容易磷酸盐化 ,在组织学上它与骨片壁不同。
- sclerite Bony upper layer lying on the fibrillary plate of a teleost scale.
- adfrontal suture