After 61 pages, most people are repeating the same stuff, so I've compiled a master list.
Some of these animals are related to pokemon we already have, but I felt that they were easily unique enough to include. A pokemon based on a basket star, for instance, would definitely be a LOT different from staryu and starmie.
MAMMALS:
anteater
pangolin
badger
Tasmanian devil
naked mole rat
koala
opossum
tarsier
aye-aye
ring tailed lemur
meerkat
tiger
cheetah or leopard
polar bear
porcupine
moose
dolphin
narwhal
elephant shrew
zebra
donkey
mountain goat/ram
bison, buffalo or ox (poison type musk ox??)
BIRDS:
flamingo
heron
vulture
toucan
hornbill
cassowary
kiwi
goose or swan
blue footed booby
hummingbird
bald eagle or harpy eagle
one of the flightless, prehistoric "terror birds"
quail
peacock
various birds of paradise
cormorant (known for swimming underwater)
frigate bird (known for the male's giant, red throat-sack)
REPTILES, AMPHIBIANS & SAUROPODS:
baja worm-lizard
horned toad
thorny devil
gila monster
komodo dragon/other monitor lizard
gharial
armadillo lizard
vine snake
constrictor snake such as boa or python
soft-shell turtle
sea turtle
sea snake
dimetrodon
mosasaur
deinonychosaur (velociraptor, troodon, etc.)
an obvious carnosaur (tyranitar is not remotely shaped like one, it's more a godzilla homage really)
pac-man frog
surinam toad or "pipa pipa"
olm
caecilian or "rubber eel"
FISH:
lionfish
stonefish
sargasso frogfish
hagfish
lamprey
flying fish
walking batfish
viperfish/dragonfish/dragon eel
tripod fish
blobfish
goosefish
wobbegong
sawfish/sawshark
torpedo ray
electric eel
barracuda
marlin
hatchetfish
ogrefish
candiru (I'm kidding)
moray eel
oarfish
bigmouth grouper
clownfish
flounder
any exotic goldfish (pop-eyed, bubble-eyed, etc.)
paddlefish
mandarin goby
glass catfish
blind cave fish
cookie cutter shark
goblin shark
whale shark
prehistoric agnathans (armored, spaceship-like fish. Ultra weird forms)
dunkleosteus (prehistoric fish with giant snapping-turtle jaws)
whorl toothed shark (prehistoric shark with a bizarre lower jaw)
MOLLUSKS:
common or giant squid
spider squid (very different from other species)
vampire squid (very different from ANYTHING else on Earth)
firefly squid (transparent except for their lights. Considered one of Japan's national treasures)
cuttlefish (google "flamboyant cuttlefish" for an especially distinctive variety)
temoctopus (a type of octopus with a giant "cape", totally awesome)
mimic octopus (a thin, tripey octopus that can imitate many other animals)
chiton
limpet
abalone
coneshell snail (these shoot venomous harpoons that can kill a man, very unique!)
CRUSTACEANS:
stomatopod (google "peacock mantis shrimp" for the best example)
isopod
hermit crab/coconut crab
fish louse/whale louse
barnacle
decorator crab
arrow crab
sand flea
triops
brine shrimp
pistol shrimp
krill/other "normal" shrimp
INSECTS:
ordinary fly
sheep ked/lousefly (crablike bloodsuckers that lose their wings, really cool!)
robber fly (predatory, long-tailed flies. Some of them are disguised as bees/wasps)
grasshopper
spiny katydid
weta
mole cricket
ants
termites
flea
louse
mosquito
velvet ant (really a wingless, fuzzy wasp with a very potent sting)
treehopper
spittlebug
aphid
mealybug
dobsonfly/hellgrammite
bombardier beetle
harlequin beetle
stinkbug
bedbug
assassin bug
giant waterbug
water boatman/backswimmer
water scorpion
water beetle
earwig
carrion or burying beetle
ambush bug
COCKROACH
lantern bug
weevil
monkey-slug caterpillar
saddleback caterpillar
inchworm caterpillar (some species are carnivorous!)
snakefly
scorpionfly
mantisfly
dung beetle
longhorn beetle
silverfish
lovebug
orchid mantis
glowworm (the cave-dwelling kind that traps bugs in glowing "fishing lines")
ARACHNIDS:
tarantula
jewel spider
bolas spider
assassin spider
vinegarone
amblypigid or "whip scorpion"
solifugid or "camel spider" (not really a spider at all)
mite
tick
horseshoe crab or ancient sea scorpion
OTHER ARTHROPODS:
tardigrade or "water bear"
centipede
millipede
peripatus or "velvet worm"
sea spider
opabinia (an extinct animal)
MISC. INVERTEBRATES:
earthworm
leech
tube worm/feather duster worm
comb jelly
larvacean (research this, it's AMAZING)
tunicate/predatory tunicate
planarian or any of the colorful marine flatworms
sponge
sea urchin
sea cucumber
sand dollar
basket star
crown of thorns starfish
tapeworm/any other internal parasitic worm
protozoan such an amoeba, paramecium or euglena
rotifer
YOUKAI (japanese mythological creatures)
karakasa (umbrella ghost)
nuppeppo (a fleshy blob spirit)
ittan momen (a paper ribbon ghost)
nurikabe (a walking concrete wall)
ushioni (a hideous bull-headed crab or spider monster)
amikiri (a bird-snake-lobster with scissor claws. No, really)
tenome (an eyeless ghost with eyes in its palms)
otoroshi (a giant blob of hair with tusks and claws)
hyakume (a mass of eyeballs)
bakekujira (a floating, skeleton whale)
mukade (a giant centipede more powerful than even dragons)
sagari (a horse head with a single hand, tail, or tentacular hair for hanging off tree branches)
-There are HUNDREDS more popular youkai. You can read several bios for them at obakemono.com and on wikipedia. Just wanted to give a rough idea of how awesome they are. We already have several pokemon based on youkai, including dunsparce, ninetales, and shiftry.
FAMOUS CRYPTIDS/URBAN LEGENDS:
chupacabra
mothman
the flatwoods monster
jenny haniver
fiji mermaid
hopkinsville goblin
dover demon
pascagoula aliens
-you may not have heard of some of these, but they are all quite popular in Japan. I've seen all of them in a number of toys and anime.
And just for my personal fun:
Animals that haven't been FAIRLY represented by Pokemon:
Anglerfish - the creepiest-looking, weirdest group of fish in the sea, and what did we get?
Lanturn.
Mole - I like dugtrio, don't get me wrong, but people who love moles deserve a pokemon that's actually, you know, shaped like one. A big clawed star-nosed mole would be neat.
Echidna and armadillo - Sandlash resembles a combination of these, but the two animals could easily make their own distinctive pokes.
Ostrich and dodo - Doduo and Dodrio look nothing like either of them.
Preying mantis - Scyther is a nice gesture, but what's with the furry dinosaur head? Besides that, it evolves into Scizor which isn't even slightly mantis-like. Give us a nice orchid mantis, gamefreak.
SPIDERS - can't stress this enough. I would never have guessed that Ariados was supposed to be a spider if I wasn't told first. Where's our big, hairy, eight-legged tarantula pokemon, sinister black widow or multi-eyed, fuzzy jumping spider?
Nudibranchs/sea slugs - alright, sure, I love the gastrodon line. It's really cool. However, take even a casual glance at
this gallery of sea slugs from national geographic and tell me there isn't WAY more potential in the idea. I wouldn't be surprised if they did make a few more in the future, though, since we already also have Fione and Manaphy - ALSO based on sea slugs (clione)
