Astraspis prehistoric fish, illustration. The oldest-known American vertebrate, Astraspis had a distinctive headshield and tapering body. The upper half of the shield had five conspicuous longitudinal ridges and numerous polygonal plates. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / DK IMAGES |
Taille de l’image : | 3851 px × 2723 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |