
Symar |

The Serpent Herald Skald in Legacy of the First World gains a limited form selection of Wild Shape, namely, Reptiles and Aquatic animals only.
Aquatic is an actual subtype I can search for, but Reptiles seems to be a vague descriptor relying on real-world information.
I'm going to do some of my own digging, and update as I come across decent choices, but if anybody has anything compiled for wildshape already, I'd love to see it.
And of course, this brings up a question, are dinosaurs in Pathfinder considered to be reptiles?

Symar |

As far as Medium Reptiles go for Beast Shape 1, the Monitor Lizard looks like the best bet with a land and swim speed of 30, low-light vision, scent, and a 1d8 bite. We don't get the grab nor poison yet, but that just means it gets slightly better at higher levels. The Giant Gecko seems good if we're after a climb speed instead.
If dinosauroids count: the Dimorphodon is good for a flight speed; and the Deinonychus is the best all-around combat form with 4 natural attacks, low-light vision, and scent, and retains some use at higher levels by gaining pounce and 60 ft speed with Beast Shape 2.

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As far as Medium Reptiles go for Beast Shape 1, the Monitor Lizard looks like the best bet with a land and swim speed of 30, low-light vision, scent, and a 1d8 bite. We don't get the grab nor poison yet, but that just means it gets slightly better at higher levels. The Giant Gecko seems good if we're after a climb speed instead.
If dinosauroids count: the Dimorphodon is good for a flight speed; and the Deinonychus is the best all-around combat form with 4 natural attacks, low-light vision, and scent, and retains some use at higher levels by gaining pounce and 60 ft speed with Beast Shape 2.
The dimorphodon is not a dinosaur and their stat-block calls them reptiles, so you should be good there.
But, the Saurian Shaman mentions their speak with animals works only with Reptiles and Dinosaurs... which leads me to believe they are supposed to be separate. Though, honestly, general creature typing, like reptile or aquatic, is so ill defined that it quickly becomes a matter for table variation.

Symar |

At Large (Beast Shape 2):
The Pteranodon is your flight option for this category with a 2d6 bite isn't awful, but the clumsy flight might be rough.
The Giant Chameleon looks pretty good with a 2d6 bite and the option to tongue instead (assuming you even get the tongue, its listed as both a natural attack which you *do* get, and a special ability which you *don't*.) Even without the tongue, it has a solid land and climb speed.
The Emporer Cobra has decent all around movement, but still, as we're pre-poison, doesn't have much over the chameleon.
The Giant Frilled Lizard is potentially the best option, as it has a 2d6 bite, and a secondary tail attack. Reach is only 5ft, but it carries a climb speed.
Alternatively, the Glyptodon (assuming this is a reptilian creature). Slowish movement, but two 1d10 claws.
If Dinosaurs are a go, then the Megaraptor is the best, hands down.
At Huge (Beast Shape 3):
Saltwater Crocodile isn't awful.
Quetzalcoaltus is your flight option, and with three attacks, is the best one so far.
Gorgosaurus (or Stegasaurs, if dinosasurs) is a decent option for Vital Strike.
Giant Sea Snake is alright with its multi-stat poison and expanded crit range.
And of course, if Dinosaurs, then Allosaurus is the way to go for combat.
Now on to aquatic typed animals.