Mollusks
Snails!
There are thousand of species!
They live on land and in lakes and rivers and the sea! They even climb trees! (albeit rather slowly.) What sets them apart from other mollusks is their coiled shell that is large enough for them to fully retreat into for safety ...or naps. I adore the movement of these little guys and enjoy their addition to game with Cataclysm. Land snails have some fun shapes, but the sea snails really went all out. Many of the shells you pick up on the beach (if they are a spiral,) are sea snails and there is a brilliant variety of shapes and colors. There is a lot of room for expansion here for the game. There is even the Cone Snail (Genus Conus), which is a predatory sea snail that have a hypodermic-like modified radula tooth attached to a venom gland used to attack and paralyze their prey. If that doesn't have "hunter pet" written all over it give me fine minutes and a sharpie.
There are thousand of species!
They live on land and in lakes and rivers and the sea! They even climb trees! (albeit rather slowly.) What sets them apart from other mollusks is their coiled shell that is large enough for them to fully retreat into for safety ...or naps. I adore the movement of these little guys and enjoy their addition to game with Cataclysm. Land snails have some fun shapes, but the sea snails really went all out. Many of the shells you pick up on the beach (if they are a spiral,) are sea snails and there is a brilliant variety of shapes and colors. There is a lot of room for expansion here for the game. There is even the Cone Snail (Genus Conus), which is a predatory sea snail that have a hypodermic-like modified radula tooth attached to a venom gland used to attack and paralyze their prey. If that doesn't have "hunter pet" written all over it give me fine minutes and a sharpie.
Rapana Whelk
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Cone Shell - Daniel, Daniel Kwok - flickrcc - Some of these have toxic enough venom to be fatal to humans.
Orange sea snail - Mark Bridge - flickrcc
Nassarius particeps Dog Whelk - eyeweed - flickrcc
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Shells from Florida's Gulf of Mexico - Tropic~7 - flickrcc - These are from my backyard! And by that I mean shells from Florida.
Color of Hawaii tidal pools - Tropic~7 - flickrcc
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Snails can also be mounts!
To the Ivory Tower!
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Octopus
There are about 300 species of Octopi and they are, of course, strictly aquatic. Their skin can change to a vast array of colors and their ability to camouflage is superb. They are quite strong and are the most intelligent of the invertebrates. They also rate up there with crows an pigs. They have been seen to use tools, find their way through mazes and complete puzzles. The ones in game are not quite that proficient, but give it time. There is wonderful opportunity for expansion - and maybe a kick ass raid boss sometime in the future.
The ones in-game remind me of the Dalek-Human Hybrid from Doctor Who. 
Thanks a lot Cult of Skaro.
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Red Octopus - matt knoth - flickrcc
Pacific Red Octopusoctopus rubescens - matt knoth - flickrcc
Walking octopus - Simone Carletti - flickrcc
Baby octopus...where are the adults?
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Clams
Also called bivalves, there are over 9,000 species. Many of them are tasty. They include clams, oysters, mussels, scallops and are exclusively aquatic. Aside from snails these are the other shells you'd collect at the beach. While some locomotion is possible, its is awkwardly done using jets of water, so this might be the first animal where I don't necessarily recommend them as mounts.
Giant Clam - spiderman (Frank) - flickr cc
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Clams at Cedar Key, Florida - Florida Sea Grant - flickrcc
She sells sea shells - simpls-is - flickrcc
Clam (Large Giant Clam) - Tridacna maxima - Boogies with Fish - flickrcc
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Starfish
There are about 1800 species of these ocean floor dwelling echinoderms. Sea urchins are in the same family. They also have a small about of locomotion, but it is slow. It is kind of cool to watch their hundreds of little sucker feet grip and release to move them around. I recommend visiting them at touch tanks at your local aquarium and experience it yourself! As long as you handle them carefully and respectfully.
I'm waiting to see these as battle pets. And again, not going to necessarily recommend them as in-game mounts. 
Starfish, part V - seasonal wanderer - flickrcc
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Starfish & Snail - ambergris - flickrcc
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