Sphenacodon

Sphenacodon is 3 metres (9.8 ft) in length it lived in the Early Permian.

Sphenacodon’s vertebral spines were long act as attachment points for massive back muscles, allowing the animal to lunge powerfully at its prey. It had heavy jaws with powerful teeth, including long canines and cutting cheek teeth.

Originally Posted by bhu of the Wizards Community forums.

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Sphenacodon
Medium animal
Hit Dice	3d8+9 (22 hp)
Initiative	+4
Speed	20 ft. (4 squares)
Armor Class	14 (+4 Natural), touch 10, flat-footed 14
Base Attack/Grapple	+2/+6
Attack	Bite +6 melee (1d8+6)
Full Attack	Bite +6 melee (1d8+6)
Space/Reach	5 ft./5 ft.
Special Attacks	Lunge
Special Qualities	Low Light Vision
Saves	Fort +6, Ref +3, Will +2
Abilities	Strength 19, Dexterity 10, Constitution 17, Intelligence 1, Wisdom 12, Charisma 2
Skills	Listen +6, Spot +6
Feats	Improved Initiative, Alertness
Environment	Warm Forest
Organization	Solitary, Pair, or Pack (3-5)
Challenge Rating	2
Treasure	None
Alignment	Always Neutral
Advancement	4-5 HD (Medium)
Level Adjustment	—-

Lunge (Ex) Once every minute the Sphenacodon can increase its base Move to 30 for that round if it is doing a charge. It gains double the normal penalties and bonuses for a Charge.