How similar is Pterodactyl to a pteranodon, becauee looking over the 2E Monstrous Manual, they have that creature listed.
Here's a quickie conversion of the pteranodon with strong influences from the quetzalcoatlus)
Pteranodon
Large Beats
Hit Dice: 3d10+9 (25 hp)
Initiative: +2 (Dex)
Speed: Speed 10 ft, Fly 40 ft (Average)
AC: 13 (-1 size, +2 Dex, +1 natural)
Attacks: Bite +6 melee
Damage: Bite 1d8+6
Face/Reach: 5 ft ft by 10 ft/5 ft
Special Attacks: Swallow Whole
Special Qualities: -
Saves: Fort +6, Ref +5, Will +4
Abilities: Str 18, Dex 15, Con 16, Int 1, Wis 17, Cha 11
Skills: Spot +16
Feats: Fly-by Attack, Snatch
Climate/Terrain: Warm forest, hills, and mountains
Organization: Flock (3-18)
Challenge Rating: 3
Treasure: None
Alignment: Always neutral
Advancement: 4-6 HD (Large), 7-9 HD (Huge)
Combat
Swallow Whole (Ex): Can swallow an opponent of at least 2 sizes smaller than self with a successful grapple check (bonus +8). Once inside the dinosaur, the opponent takes 1d4+2 bludgeoning damage and 1d4 acid damage per round from the gizzardd. A successful grapple check is needed to get free. Or a swallowed creature can cut its way out with either claws or a light piercing or slashing weapon) Dealing at least 15 points of damage in this way creates a hole large enough to escape. Once a single creature exists, muscular acton closes the hole, thus another swallowed opponent must cut its own way out. A large pteranodon's gizzard can hold 1 small, 4 Tiny, 16 Diminuitieve or 64 Fine opponents.
Freats: A creature that is flkung by the pteranodon after being snatched travels 30 ft and takes 3d6 damage. If the pteranodon is flying, the creature takes this damage or the appropriate falling damage, whichever is greater.