one of a kind
sui generis
unicum
topotype
rarity
kind
unicate
plastotype
isolectotype
isoneotype
one-off
marbled crayfish
largemouth
shortfin
lovely
holotype
type specimen
duplicate
intraspecimen
macrobioeroder
lindworm
Arctic wolf
diatexite
heterodont
uniloculate
eutrustox
creature
microplasmodium
microtubule
monster
onomatophore
semimonster
acerathere
microartefact
cottonoid
melanolysosome
unsinkable
sour gum
nanozooid
floater
nonreptile
arteether
abhuman
beast
all that and a bag of chips
airshoot
tiara
tectotype
microcantilever
solopathogen