The crawling urhook has replaced it's ancestor, the hookhead urphish. It has developed strong rear lobe-fins supported by a rigid spine-like collagen notochord, which also enables it to slither the upper half of it's body and pull itself along using it's hook and rear fins for pushing power, allowing it to crawl at a slow rate. This has allowed it to become amphibious, increasing it's range of prey and breeding grounds. The most noticeable change in this species, however, is the fact that it's eggs are now laid and buried under damp sand, instead of in water.
Living Relatives (click to show/hide)
These are randomly selected, and organized from lowest to highest shared taxon. (This may correspond to similarity more than actual relation)
