Dire Maggot (CR 2)

Small Vermin
Alignment: Always neutral
Initiative: +2 (Dex); Senses: darkvision 60 ft. and Spot +4

AC: 16 (-2 size, +2 Dex, +6 natural), touch 10, flat-footed 14
Hit Dice: 6d8+6 (33 hp)
Fort +4, Ref +4, Will +2
Speed: 40 ft., climb 40 ft.
Space: 15 ft. /10 ft.
Base Attack +4; Grapple +15
Attack: Bite +3 melee
Full Attack: Bite +3 melee
Damage: Bite 1d8+2 plus paralytic saliva
Special Attacks/Actions: Paralytic saliva
Abilities: Str 13, Dex 15, Con 12, Int -, Wis 10, Cha 2
Special Qualities: vermin traits
Feats: -
Skills: Climb +11, Hide +2, and Spot +4
Advancement: 7-11 HD (Small)
Climate/Terrain: Underground
Organization: Solitary or slaughter (2-5)
Treasure: -

Source: Libris Mortis

A four-foot-long dead-white segmented worm heaves into view. Eyeless, drooling stinking ichor from its clocking mandibles, the monstrosity resembles nothing so much as a maggot grown orders of magnitude too large.

A maggot is the worm-shaped larva of a fly, but a dire maggot is the larva of similarly monstrous flying vermin. While regular maggots are found in decaying matter, dire maggots are large, quick, and aggressive enough to seek out living prey for nourishment.