These head shields were wider than the rest of the body, and they sometimes tended toward extravagance, as in the case of Boreaspis, a fish that sported a large spike sprouting from its face.

这些头盾比身体的其他部分更宽，它们有时会显得过于奢华，例如北吻鱼， 这是一种脸上长着一根大刺的鱼。