Converting prehistoric animals

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Demiurge, if you're happy with the results, lets move on to the rest of the unconverted sauropods (Cetiosaurus, Mamenchisaurus, Massospondylus).

Also, it might be worth looking at your version of Apatosaurus to the one currently in the CC to see if any modifications are needed.
 

The CC version of the apatosaurus was based on mine, so no worries.

Cetiosaurus
Gargantuan Animal
Hit Dice: 15d8+78 (145 hp)
Initiative: +0
Speed: 30ft (6 squares)
Armor Class: 12 (-4 size, +6 natural), touch 6, flat-footed 12
Base Attack/Grapple: +11/+30
Attack: Tail slam +14 melee (2d8+10)
Full Attack: Tail slam +14 melee (2d8+10)
Space/Reach: 20ft/20ft
Special Attacks: Trample
Special Qualities: Low-light vision, scent
Saves: Fort +16, Ref +9, Will +9
Abilities: Str 24, Dex 11, Con 20, Int 1, Wis 15, Cha 10
Skills: Listen +10, Spot +10, Swim +13
Feats: Alertness, Endurance, Great Fortitude, Iron Will, Toughness
Environment: Warm plains and forest (islands)
Organization: Solitary or pair
Challenge Rating: 7
Treasure: None
Alignment: Always neutral
Advancement: 16-30 HD (Gargantuan), 31-45 HD (Colossal)
Level Adjustment: -

This massive quadruped has a powerful tail, a long neck, and a sloping back.

Cetiosaurs are a species of primitive sauropods that live on beaches and islands.

A cetiosaurus is about 50 feet long, small for a sauropod. They are beachcombers, and their small size might be indicative of a less nourishing diet or reduced risk of predation. They live solitary lives, and most only see other cetiosaurs to mate.

Combat
Cetiosaurs use their tails if threatened like their larger kin, and like them can merely crush smaller creatures in their path.

Trample (Ex): A cetiosaurus can literally run over any creatures in its way that are of Huge or smaller size. Creatures trampled must make a Reflex save (DC 24 half) or take 4d8+10 damage. The save DC is Strength based.


Again, I might boost the natural armor class. Maybe a racial bonus on Swim checks for the coastal environment.
 

Let's make both those modifications. The AC really needs to be a lot higher, even at CR 7, I think. +10 natural armor?
 

Added to Homebrews with those modifications.

Unless my math is off, it looks like it gets one more feat.

"It is estimated to have been about 53 feet (15-16 m) long and to have weighed roughly 24800 kg"

This equates to about 55,000 pounds.
 

Well, we could go with Lightning Reflexes. Or Power Attack, though that's not quite so logical.
 



Mamenchisaurus?

Mamenchisaurus
Hit Dice: 22d8+157 (253 hp)
Initiative: +1
Speed: 30ft (6 squares)
Armor Class: 12 (-8 size, +1 Dex, +9 natural), touch 3, flat-footed 11
Base Attack/Grapple: +16/+42
Attack: Tail slam +18 melee (4d6+15 plus thunderous snap)
Full Attack: Tail slam +18 melee (4d6+15 plus thunderous snap)
Space/Reach: 50ft/40ft
Special Attacks: Thunderous snap, trample 8d8+15
Special Qualities: Low-light vision, scent
Saves: Fort +22, Ref +14, Will +11
Abilities: Str 30, Dex 12, Con 25, Int 1, Wis 14, Cha 10
Skills: Listen +12, Spot +21
Feats: Alertness, Diehard, Endurance, Great Fortitude, Iron Will, Power Attack, Toughness (x2)
Environment: Warm forests, plains and hills
Organization: Solitary, pair or herd (10-24)
Challenge Rating: 10
Treasure: None
Alignment: Always neutral
Advancement: 23-66 HD (Colossal)
Level Advancement: -

This massive quadruped has a long tail, a box-like head attached to a disproportionately long neck, and a wrinkled, elephantine hide.

Although mamenchisaurs are not the longest, heaviest or otherwise record-setting dimensionally of the massive sauropods, they do have the longest necks of their family.

The neck of a mamenchisaurus takes up almost 40 feet of its 70 foot length and is held at a slightly erect angle. Due to the massive pressures needed to pump blood up to its head, multiple heart-like structures are positioned along its neck. Mamenchisaurs are at a significant advantage when it comes to a wide field of vision and a selection of food from the tallest of trees, but their lives are among the shortest of the sauropods (only seventy-five years at a maximum, barring a violent end) due to their fragile hearts.

Combat
Although they are more closely related to camarasaurs and brachiosaurs than diplodocids, they bear the latter’s whip-like tail, complete with its sonic consequences. More often then not, however, they merely trod on any threat to their safety.

Thunderous Snap (Ex): Although they are ponderous, a mamenchisaurus’ whip-like tail can move faster than sound. Any creature struck by a mamenchisaurus’ tail slam must make a Fortitude save (DC 28) or be stunned for 1d4 rounds and deafened for 1d4 minutes. On a successful save, the creature is merely deafened for 1d4 minutes. The save DC is Constitution based.

Trample (Ex): A mamenchisaurus can literally run over any creatures in its way that are of Gargantuan or smaller size. Creatures trampled must make a Reflex save (DC 31 half) or take 8d8+15 damage. The save DC is Strength based.

Perhaps we should get rid of Toughness x2. Since it qualifies for one epic feat... Epic Toughness?
 

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