membracid
Any of the insect family Membracidae.

membracids
plural of membracid

membraniporid
Any bryozoan in the family Membraniporidae.

membraniporids
plural of membraniporid

mengenillid
Any fly of the family Mengenillidae

mengenillids
plural of mengenillid

menid
Any fish in the family Menidae, the moonfishes.

menids
plural of menid

menippid
Any crab in the family Menippidae.

menippids
plural of menippid

meniscotheriid
Any extinct mammal of the subfamily †Meniscotheriinae

meniscotheriids
plural of meniscotheriid

menobranch
A large aquatic American salamander of the genus Necturus (formerly Menobranchus), with permanent external gills.

menobranchs
plural of menobranch

menoponid
Any louse in the family Menoponidae.

menoponids
plural of menoponid

meridiolestidan
Any extinct mammal of the clade †Meridiolestida

meridiolestidans
plural of meridiolestidan

meriki
Alternative form of moeriki.

meropid
Any bird in the family Meropidae, the bee-eaters.

meropidan
Any bird (such as the bee-eaters) of the family Meropidae

meropidans
plural of meropidan

meropids
plural of meropid

merostomatan
Any arthropod of the class Merostomata.

merulid
Any bird in the family Merulidae, an old name for the Turdidae; a thrush.

merulids
plural of merulid

merulinid
Any stony coral of the family Merulinidae

merulinids
plural of merulinid

mesacanthid
Any acanthodian fish of the family Mesacanthidae

mesacanthids
plural of mesacanthid

mesembrinellid
Any fly of the family Mesembrinellidae

mesembrinellids
plural of mesembrinellid

mesoconid
A conulid in the median murid where the mesolophid is attached to it.

mesoconids
plural of mesoconid

mesonychid
An extinct carnivore of the order †Mesonychia.

mesonychids
plural of mesonychid

mesoplodont
Any whale of the genus Mesoplodon.

mesoplodonts
plural of mesoplodont

mesosaurid
Any extinct reptile in the family Mesosauridae; a mesosaur.

mesosaurids
plural of mesosaurid

mesostigmatid
Any mite of the order Mesostigmata

mesostigmatids
plural of mesostigmatid

mesotardigrade
Any tardigrade or similar animal of the dubious class Mesotardigrada

mesothere
Any extinct notoungulate of the genus †Mesotherium

mesotheriid
Any extinct mammal in the family Mesotheriidae.

mesotheriids
plural of mesotheriid

mesozoan
Any worm-like, marine parasite of the phylum Mesozoa.

mesozoans
plural of mesozoan

mesozooid
Alternative form of mesozoan.

mesozooids
plural of mesozooid

metalmark
Any butterfly of the family Riodinidae.

metaltelline
Any spider of the subfamily Metaltellinae.

metaltellines
plural of metaltelline

metastrongylid
Any nematode in the family Metastrongylidae.

metastrongylids
plural of metastrongylid

metoposaur
Any extinct temnospondyl of the genus †Metoposaurus

metoposauroid
Any extinct temnospondyl of the superfamily †Metoposauroidea

metoposauroids
plural of metoposauroid

metoposaurs
plural of metoposaur

metridinid
Any copepod in the family Metridinidae.

metridinids
plural of metridinid

microbiothere
Any marsupial of the order Microbiotheria; a monito del monte.

microbiotheres
plural of microbiothere

microbiotheriid
Any marsupial in the family Microbiotheriidae; a colocolo opossum.

microbiotheriids
plural of microbiotheriid

microbothriid
Any parasitic flatworm of the order Microbothriidae

microbothriids
plural of microbothriid

microcerberid
Any isopod in the family Microcerberidae.

microcerberids
plural of microcerberid

microcionid
Any sponge in the family Microcionidae.

microcionids
plural of microcionid

microconch
The male form of an ammonite (that has a smaller shell than the female (the macroconch).

microconches
plural of microconch

microconchid
Any fossil worm of the order †Microconchida

microconchids
plural of microconchid

microconchs
plural of microconch

microcotylid
Any flatworm of the family Microcotylidae

microcotylids
plural of microcotylid

microdesmid
Any fish in the family Microdesmidae, the wormfishes and dartfishes.

microdesmids
plural of microdesmid

microdomatid
Any gastropod in the family Microdomatidae.

microdomatids
plural of microdomatid

microgastrine
Any braconid wasp of the subfamily Microgastrinae.

microgastrines
plural of microgastrine

microgastropod
Any very small gastropod, typically less than 5 mm in size

microhedylid
Any gastropod in the family Microhedylidae, possibly a synonym of the Parhedylidae.

microhedylids
plural of microhedylid

microhylid
Any of the frog family Microhylidae.

microhymenopteran
Any very small insect of the order Hymenoptera

microhymenopterans
plural of microhymenopteran

micromalthid
Any beetle in the family Micromalthidae.

micromalthids
plural of micromalthid

micromelaniid
Any aquatic snail in the family Micromelaniidae, now considered to be a synonym of the hydrobiid subfamily Pyrgulinae.

micromelaniids
plural of micromelaniid

micropezid
Any fly of the family Micropezidae.

micropezids
plural of micropezid

microphysid
Any bug in the family Microphysidae.

microphysids
plural of microphysid

microporellid
Any bryozoan in the family Microporellidae.

microporellids
plural of microporellid

micropterigid
Any moth in the family Micropterigidae.

micropterigids
plural of micropterigid

micropygid
Any sea urchin in the family Micropygidae

micropygids
plural of micropygid

microsporid
Any beetle in the family Microsporidae, a synonym of the Sphaeriusidae.

microsporids
plural of microsporid

microstigmatid
Any spider in the family Microstigmatidae.

microstigmatids
plural of microstigmatid

microstomatid
Any fish in the family Microstomatidae.

microstomatids
plural of microstomatid

microstomid
Any flatworm in the family Microstomidae.

microstomids
plural of microstomid

micryphantid
Any spider in the family Micryphantidae, now considered to be a synonym of the linyphiid subfamily Erigoninae.

micryphantids
plural of micryphantid

mictyrid
Any crab in the family Mictyridae.

mictyrids
plural of mictyrid

migid
Any spider in the family Migidae.

migids
plural of migid

milichiid
Any fly of the family Milichiidae.

milichiids
plural of milichiid

millepore
Any coral of the genus Millepora, having the surface nearly smooth, and perforated with very minute unequal pores, or cells.

millepores
plural of millepore

milleporine
Any coral of the genus Millepora.

milleporite
A fossil millepore.

milu
Père David's deer, a species of deer native to the river valleys of China.

milus
plural of milu

mimallonid
Any moth in the family Mimallonidae.

mimallonids
plural of mimallonid

mimetid
Any spider in the family Mimetidae.

mimetids
plural of mimetid

mimid
Any bird in the family Mimidae, the mockingbirds, catbirds and thrashers.

mimids
plural of mimid

mimotonid
Any extinct lagomorph of the family Mimotonidae

mimotonids
plural of mimotonid

minipig
A small pig of a breed used in biological research

minipigs
plural of minipig

minstreless
A female minstrel.

minstrelesses
plural of minstreless

mirapinnid
Any of several genera of deep-sea fish of the family Mirapinnidae, now known to be the larval forms of whalefish in the family Cetomimidae.

mistflies
plural of mistfly

mistfly
Any of various species of dragonfly of the genus Pseudocordulia, endemic to tropical northeastern Australia.

miturgid
Any spider in the family Miturgidae.

miturgids
plural of miturgid

mixodectid
Any extinct mammal in the family Mixodectidae.

mixodectids
plural of mixodectid

mixopterid
Any extinct sea scorpion in the family Mixopteridae.

mixopterids
plural of mixopterid

mnesarchaeid
Any moth in the family Mnesarchaeidae.

mnesarchaeids
plural of mnesarchaeid

modiolopsid
Any extinct bivalve of the family Modiolopsidae.

modiolopsids
plural of modiolopsid

modiomorphid
Any of the Modiomorphidae, an extinct family of bivalve mollusks.

modiomorphids
plural of modiomorphid

modulid
Any sea snail in the family Modulidae.

modulids
plural of modulid

moeriki
An extinct bird, Dieffenbach's rail (†Gallirallus dieffenbachii).