proterogyrinids
plural of proterogyrinid

protocetid
Any of a group of extinct cetaceans, of the family †Protocetidae, from the Eocene period

protocetids
plural of protocetid

protococcidian
Any protozoan of the order Protococcidiorida

protococcidians
plural of protococcidian

protoconodont
Any conodont of the order †Protoconodontida.

protocooperation
The situation where two species interact with each other beneficially, without having a specific need to do so.

protoelongate
Any ribbed miter of the genus Protoelongata.

protoelongates
plural of protoelongate

protoglobin
A simple globin, found in some archaea, that can bind oxygen and carbon monoxide

protoglobins
plural of protoglobin

protoloph
Any harvestman of the genus Protolophus
A crest on a lophodont molar

protolophid
Any harvestman of the family Protolophidae

protolophids
plural of protolophid

protolophs
plural of protoloph

protomicrocotylid
Any monogenean in the family Protomicrocotylidae.

protomicrocotylids
plural of protomicrocotylid

protomont
An immature or beginning stage of a tomont.

protomonts
plural of protomont

protophyte
Any of various primitive organisms such as the slime molds

protophytes
plural of protophyte

protoplasmodia
plural of protoplasmodium

protoplasmodium
A primitive plasmodium composed of an undifferentiated microscopic mass

protopterid
Any in the family Protopteridae of African lungfishes.

protopterids
plural of protopterid

protospecies
A preexisting type of species from which other species evolved.

protostelid
Any of the Protosteliales, a group of primitive slime molds.

protostelids
plural of protostelid

protosuchian
Any crocodyliform of the clade Protosuchia

protosuchians
plural of protosuchian

protosuchid
Any crocodylomorph in the family Protosuchidae.

protosuchids
plural of protosuchid

protothecoide
A microalga of the species Auxenochlorella protothecoides

protothecoides
plural of protothecoide

prototroph
Any microorganism that can synthesize its nutrients from inorganic material

prototrophs
plural of prototroph

protozoa
plural of protozoan
plural of protozoon

protozoon
A protozoan.

protozooplankton
protozoan plankton

provannid
Any gastropod of the family Provannidae, especially those found associated with hydrothermal vents

provannids
plural of provannid

proviverrine
Any of the hyaenodontid subfamily †Proviverrinae of extinct mammals.

proviverrines
plural of proviverrine

prozostrodont
Synonym of prozostrodontian.

prozostrodontian
Any cynodont of the clade Prozostrodontia

prozostrodontians
plural of prozostrodontian

psettodid
Any flatfish in the family Psettodidae.

psettodids
plural of psettodid

pseudoaethalia
plural of pseudoaethalium

pseudoaethalium
A structure consisting of many sporangia packed together in certain myxomycete species.

pseudoalterin
A metalloprotease isolated from deep-sea bacteria of a Pseudoalteromonas species.

pseudoalteromonad
Any marine bacterium of the genus Pseudoalteromonas (or of the family Pseudoalteromonadaceae)

pseudoalteromonads
plural of pseudoalteromonad

pseudoclimacograptid
Any graptolite of the genus Pseudoclimacograptus.

pseudoextinction
phyletic extinction; the situation where all members of a species are extinct, but members of a daughter species remain alive

pseudoextinctions
plural of pseudoextinction

pseudofungi
plural of pseudofungus

pseudofungus
Any chromist of the phylum Pseudofungi

pseudogarypid
Any pseudoscorpion in the family Pseudogarypidae.

pseudogarypids
plural of pseudogarypid

pseudogenera
plural of pseudogenus

pseudogenus
A spurious genus based on apparent similarities in unrelated organisms.

pseudokeronopsid
Any hypotrich of the family Pseudokeronopsidae

pseudokeronopsids
plural of pseudokeronopsid

pseudomonad
Any of many bacteria of the family Pseudomonadaceae, some of which are pathogenic

pseudomonads
plural of pseudomonad

pseudopilus
A structure, in gram-negative bacteria, that expels exoproteins from the cell

pseudoplankton
Any plankton that lacks buoyancy and so attaches itself to a floating object.

pseudoplanktons
plural of pseudoplankton

pseudotentacle
A tentacle-like outgrowth found on various species

pseudotentacles
plural of pseudotentacle

pseudothecia
plural of pseudothecium

pseudothecium
An ascocarp resembling a perithecium but whose asci are not regularly organised into a hymenium and are bitunicate, having a double wall which expands when it takes up water and shoots the enclosed spores out suddenly to disperse them.

pseudourostylid
Any hypotrich of the family Pseudourostylidae

pseudourostylids
plural of pseudourostylid

psilostomatid
Any trematode in the family Psilostomatidae.

psilostomatids
plural of psilostomatid

psychid
Any of the family Psychidae; a bagworm.

psychids
plural of psychid

pteridin
Any erniettomorph of the genus Pteridinium

pteridins
plural of pteridin

pteroenone
A hydroxyketone synthesized by Clione species as a defense against being eaten.

pteronarcyid
Any stonefly in the family Pteronarcyidae.

pteronarcyids
plural of pteronarcyid

pterygotid
Any eurypterid in the family Pterygotidae.

pterygotids
plural of pterygotid

ptilodontoid
Any of the superfamily †Ptilodontoidea of extinct mammals.

ptilodontoids
plural of ptilodontoid

ptyctodont
Any placoderm of the order Ptyctodontida

ptyctodontid
Any placoderm of the order Ptyctodontida.

ptyctodontids
plural of ptyctodontid

ptyctodonts
plural of ptyctodont

puffball
Any of various fungi, usually globose, that produce a cloud of brown dust-like spores from their mature fruiting bodies, especially in family Lycoperdaceae.
Any of various mushrooms with globose fruiting bodies.
A dandelion flower that has gone to seed, a dandelion clock.
Something lacking substance.

puffballs
plural of puffball

puffleg
Any of numerous species of hummingbirds of the genera Eriocnemis and Haplophaedia, with large tufts of downy feathers on the legs.

pufflegs
plural of puffleg

pupillid
Any in the family Pupillidae of snails.

pupillids
plural of pupillid

purpletuft
Any of the genus Iodopleura of small, short-tailed birds found in the canopy of forests in tropical South America.

purpletufts
plural of purpletuft

pycnidiospore
A spore from a pycnidium.

pycnidiospores
plural of pycnidiospore

pycniospore
A spore produced by a pycnium

pycniospores
plural of pycniospore

pycnoconidium
A conidium produced in a pycnidium.

pycnophyid
Any kinorhynch of the family Pycnophyidae.

pycnophyids
plural of pycnophyid

pycnospore
Synonym of stylospore.
Synonym of pycniospore.

pycnospores
plural of pycnospore

pygidicranid
Any earwig in the family Pygidicranidae.

pygidicranids
plural of pygidicranid

pygoscelid
Any penguin of the genus Pygoscelis.

pygoscelids
plural of pygoscelid

pygostylian
Any avialan of the clade Pygostylia, that has a pygostyle

pygostylians
plural of pygostylian

pyrosome
Any of several pelagic colonial tunicates, of the genus Pyrosoma, found in tropical waters.

pyrosomes
plural of pyrosome

pyrostephid
Any siphonophore of the family Pyrostephidae

pyrostephids
plural of pyrostephid

quasimolecule
A quasimolecular species

quasimolecules
plural of quasimolecule

quasispecies
A group of organisms once (but no longer) thought to be a separate species (and sometimes given such a name)
A group of similar nucleic acid molecules; a group of organisms (especially viruses) having such similar genomes.

querquedule
teal (of the genus Querquedula)

querquedules
plural of querquedule

questin
The substituted anthraquinone 3-methyl, 1,6-dihydroxy, 8-methoxy 9,10-anthraquinone found in some species of Rubiaceae

radiobe
A peculiar formation, possibly a crystal, formed in gelatin submitted to the action of radium, once thought to be a transitional form between a crystal and a living microbe.

radiobes
plural of radiobe

radiolarian
Any of many marine amoeboid protozoa, of subclass Radiolaria, having filamentous pseudopodia; they have intricate silica skeletons.