some preliminary stats for the hallucigenia:
Hallucigenia
Huge Vermin (Aquatic)
Hit Dice: 9d8+X (X hp)
Initiative: +X
Speed: 25 ft (5 squares)
Armor Class: 15 (-2 size, +X Dex, +X natural), touch X, flat-footed X
Base Attack/Grapple: +6/+X
Attack: X
Full Attack: “Tail” +X melee (1d10+X) and 6 tentacles +X melee (1) and 7 pincer-tentacles (1d4+X)
Space/Reach: 15 ft/15 ft
Special Attacks: constrict, trample/pierce
Special Qualities: amphibious?, darkvision 60 ft
Saves: Fort +X Ref +X Will +X
Abilities: Str X, Dex X, Con X, Int ---, Wis X, Cha X
Skills:
Feats: (Multiattack)
Environment: Any aquatic
Organization: Solitary or 1-4
Challenge Rating: X
Treasure: None
Alignment: Always neutral
Advancement: 10-18 HD (Huge); 19-27 HD (Gargantuan)
Level Adjustment: ---
Hallucigenia, Cave
Small Vermin (Aquatic)
Hit Dice: 4d8+X (X hp)
Initiative: +X
Speed: 5 ft (1 squares)
Armor Class: 14 (+1 size, +X Dex, +X natural), touch X, flat-footed X
Base Attack/Grapple: +3/+X
Attack: X
Full Attack: 14 spines +X melee (1)
Space/Reach: 5 ft/5 ft
Special Attacks: Blood drain
Special Qualities: Darkvision 60 ft
Saves: Fort +X Ref +X Will +X
Abilities: Str X, Dex X, Con X, Int ---, Wis X, Cha X
Skills:
Feats:
Environment: Any aquatic
Organization: Solitary or 1-12
Challenge Rating: X
Treasure: None
Alignment: Always neutral
Advancement: 5-8 HD (Small); 9-12 HD (Medium)
Level Adjustment: ---
Hallucigenia, Acidic
Large Vermin (Aquatic)
Hit Dice: 5d8+X (X hp)
Initiative: +X
Speed: 10 ft (2 squares)
Armor Class: 15 (-1 size, +X Dex, +X natural), touch X, flat-footed X
Base Attack/Grapple: +3/+X
Attack: X
Full Attack: 3 spines +X melee (1d4+X) and 4 tentacles +X melee (1d4+X)
Space/Reach: 5 ft/5 ft
Special Attacks: Acid jet
Special Qualities: Darkvision 60 ft, immunity to acid
Saves: Fort +X Ref +X Will +X
Abilities: Str X, Dex X, Con X, Int ---, Wis X, Cha X
Skills: X
Feats: X
Environment: Any aquatic
Organization: Solitary or pair
Challenge Rating: X
Treasure: None
Alignment: Always neutral
Advancement: X
Level Adjustment: ---