The fossil record of lampreys is sparse, and the fossils that do exist are hard to interpret. This new specimen from the Cretaceous Jehol biota of China plugs a 300-million-year gap in the fossil ...

Elongated preorbital and orbital portions (shared with anatomically modern coelecanths); suturally positioned large pores of the supraorbital sensory canal (shared with anatomically modern ...

Since the production of preorbital secretion goes on all the time, the non-territorial adult ♂ ♂ also have to get rid of it and mark relatively frequently. Certain observations as well as the increase ...