THEORIES FOR LAND TRAVEL
The fish ultimately succeeded were those that developed features that made them better fishes.
Lobe-finned fishes
are the group that eventually made evolutionary changes to what we now know as tetrapods.
there are two types:
lungfish
and
crossoptergians
when more tetrapods started to appear at 340 Ma
There was a branching of two groups
Amphibians - Laid unshelled eggs
mammals, dinosaurs, and reptiles laid amniotic eggs.
This is an evolutionary tree for the earliest tetrapods.
It starts out with the lobe-finned fish and then branches into two with amphibians branching off by itself to the left.
