TrilobiteCreature -1
Source Pathfinder Monster Core 2
Perception +8 (darkvision, wavesense (imprecise) 30 feet)
Languages none
Skills Athletics +4, Stealth +5, Survival +4
Str +1, Dex +3, Con +2, Int -5, Wis +2, Cha +0
AC 15; Fort +4; Reflex +7; Will +4;
HP 7
Speed 0 feet (swim 25 feet)
Gnathobase
+7 (+3, -1) to hit (agile, finesse) 1d4+1 SlashingCurl Up

Trigger The trilobite takes damage
Effect The trilobite gains a +2 circumstance bonus to AC until the start of its next turn.
Quick Escape
The trilobite Swims up to double its Speed and attempts to Hide.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AnimalAn animal is a creature with a relatively low intelligence. It typically doesn't have an Intelligence attribute modifier over –4, can't speak languages, and can't be trained in Intelligence-based skills.
AquaticAquatic creatures are at home underwater. Their bludgeoning and slashing unarmed Strikes don't take the usual –2 penalty for being underwater. Aquatic creatures can breathe water but not air.