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Description
So here they are!
Now I feel quite sorry I didn't color the lower one, but the mouth was so out of perspective that I had doubts I will be able to correct it digitally without photoshop, so I didn't bother, but then I felt so sorry for it to leave it out, that I did it partially in MS Pain' and partially in MS Word. It was a long run but I hope it payed out.

The upper one is named Gracilignathus only, no idea for a specific name... (G. scriptus maybe?)
The lower one now goes by the name of "White sharks' jaw" - Squalognathus albus (because the sketch has been left blank, but it might just be light grey in "real life", or a new speciffic name will take its place)
The different jaws are partially for the fun of playing with the shape of the critters, but the variety here is still reasonable, each of them might prefer a different kind of prey or they each use a different hunting stategy. Also, it was a great opportunity to breathe in a little bit more diversity.
If you failed to find the third pair of legs, look at the oval shapes on the tail fin. They're merely pelvic bone vestiges
They flap the tail sidewise, like sharks, but they breathe air, so they have to return to the surface like whales.
I imagine them to be ovoviviparous, the eggs would be kept inside the body (the cloaca is in the gap between the braincase and jaws) and the eggs will be gradually pushed out.
Then a mechanism similar to the pig-nosed turtle (Carretochelys insculpta) kicks in, the young will hatch immediatelly when the water washes over the eggs and then they will race to the surface to breathe in for the first time.
The young are immediatelly able fo care of themselves, they have to find their way to the top of the foodchain without their parent's help.

Other mesognathid sketches:
[link]
[link]
[link]
[link]
[link]
[link]
[link]
[link]

Description
So here they are!
Now I feel quite sorry I didn't color the lower one, but the mouth was so out of perspective that I had doubts I will be able to correct it digitally without photoshop, so I didn't bother, but then I felt so sorry for it to leave it out, that I did it partially in MS Pain' and partially in MS Word. It was a long run but I hope it payed out.

The upper one is named Gracilignathus only, no idea for a specific name... (G. scriptus maybe?)
The lower one now goes by the name of "White sharks' jaw" - Squalognathus albus (because the sketch has been left blank, but it might just be light grey in "real life", or a new speciffic name will take its place)
The different jaws are partially for the fun of playing with the shape of the critters, but the variety here is still reasonable, each of them might prefer a different kind of prey or they each use a different hunting stategy. Also, it was a great opportunity to breathe in a little bit more diversity.
If you failed to find the third pair of legs, look at the oval shapes on the tail fin. They're merely pelvic bone vestiges
They flap the tail sidewise, like sharks, but they breathe air, so they have to return to the surface like whales.
I imagine them to be ovoviviparous, the eggs would be kept inside the body (the cloaca is in the gap between the braincase and jaws) and the eggs will be gradually pushed out.
Then a mechanism similar to the pig-nosed turtle (Carretochelys insculpta) kicks in, the young will hatch immediatelly when the water washes over the eggs and then they will race to the surface to breathe in for the first time.
The young are immediatelly able fo care of themselves, they have to find their way to the top of the foodchain without their parent's help.

Other mesognathid sketches:
[link]
[link]
[link]
[link]
[link]
[link]
[link]
[link]