stylonychid
Any ciliate of the genus Stylonychia.

stylonychids
plural of stylonychid

stylospore
A spore that has a thin stalk.

stylospores
plural of stylospore

subfamilies
plural of subfamily

subfamily
A taxonomic category ranking between a family and a genus; formerly called a tribe.
A secondary or subordinate grouping.

subpathotype
Any of a group of organisms (of the same species) that have less pathogenicity, on a specified host, than others

subpathotypes
plural of subpathotype

subspeciation
The formation or evolution of a subspecies.

subspeciations
plural of subspeciation

subspecies
A rank in the classification of organisms, below species.
A taxon at that rank, often indicated with trinomial nomenclature (such as Felis silvestris silvestris in zoology and Pinus nigra subsp. salzmannii in botany).
A subdivision of a species in other scientific disciplines.

subsubspecies
A subspecies of a subspecies.

subtilisin
A protease produced by soil bacteria of the genus Bacillus.

subtilisins
plural of subtilisin

subtilopeptidase
Synonym of subtilisin.

subtilopeptidases
plural of subtilopeptidase

subtilysin
Alternative form of subtilisin.

subtilysins
plural of subtilysin

subtroglophile
Any organism that lives in caves for part of the time

subtroglophiles
plural of subtroglophile

suctorian
A protist of the subclass Suctoria in the class Phyllopharyngea; a predatory sessile ciliate.

suctorians
plural of suctorian

suessiacean
Any dinoflagellate of the family Suessiaceae.

suessiaceans
plural of suessiacean

sugarbird
Any of the genus Promerops of passerine birds of southern Africa, with brownish plumage, the long downcurved bill typical of passerine nectar feeders, and long tail feathers.

suikerbos
The sugarbush (Protea species).

suine
(strictly) An even-toed ungulate belonging to the taxonomic subfamily Suinae, which is comprised of modern pigs (genus Sus) and their close relatives, both living and extinct.
(loosely) An even-toed ungulate belonging to the suborder Suina.
A buttery substitute usually made of suet or lard.

suines
plural of suine

superfecundity
Superabundant fecundity or multiplication of the species.

supergenera
plural of supergenus

supergenus
A rank above genus and below tribe

supermicrobe
A (typically synthetic) microbe that is resistant to many viruses

supermicrobes
plural of supermicrobe

superomniscience
True, transcendent omniscience; truly unrestricted knowledge of all things, including species.

superspecies
A group of at least two more or less distinct species with approximately parapatric distributions.

suprapopulation
All the individuals of a species at all stages in their life cycle (in all hosts) in an ecosystem

suprapopulations
plural of suprapopulation

surugamide
Any of a group of cyclic octapeptides present in some marine bacteria

surugamides
plural of surugamide

suscept
A species which is capable of being infected or parasitized by another species.

suscepts
plural of suscept

swelltoad
Any of the genus Cyclichthys of blowfishes.

swelltoads
plural of swelltoad

sylviid
Any of the warblers in the family Sylviidae.

sylviids
plural of sylviid

symbiontid
Any protozoan of the subphylum Symbiontida

symbiontids
plural of symbiontid

symbiosis
A relationship of mutual benefit, especially among different species.
The close and long-term relationship or interaction between two or more different species in which at least one of the organisms benefit.
The close and long-term relationship or interaction between two or more different species in which at least one of the organisms benefit.
The state of people of different types, races, cultures, communities, etc., living together.
The occurrence of two different or opposing things in the same time and place.

symbiosome
The vacuole structure containing a symbiont.

symbiosomes
plural of symbiosome

symphylan
Any of many arthropods of the class Symphyla.

symphyomyrtle
Any eucalypt of the genus Symphyomyrtus

symphyomyrtles
plural of symphyomyrtle

synantherology
The study of the Asteraceae.

synapomorphies
plural of synapomorphy

synapomorphy
A derived trait that is shared by two or more taxa of shared ancestry.

syncarid
Any crustacean of the superorder Syncarida, which have no carapace.

syncarids
plural of syncarid

syndinean
Any dinoflagellate of the class Syndinea

syndineans
plural of syndinean

syngameon
A grouping of genetically related organisms that may or may not be morphologically similar and are recognized by systematists as being in different species or subspecies and may even belong to different genera.
A suite of partially interfertile species that exchange genes, either directly or indirectly, under certain evolutionary and biogeographic conditions, and where interspecific gene flow is episodic and spatially variable in nature.

syngameons
plural of syngameon

syngamid
Any in the family Syngamidae of nematodes.

syngamids
plural of syngamid

syntelog
Any of two or more homologous gene sequences found in different species that have a common ancestor

syntelogs
plural of syntelog

syntype
Any one of two or more specimens specified in the description of a species (or lower-order taxon), where no specimen has been designated as holotype.

syntypes
plural of syntype

synusia
A layer of vegetation consisting of species with shared life forms.

syzygants
plural of syzygant

taeniid
Any tapeworm in the family Taeniidae.

taeniids
plural of taeniid

taeniolabidoid
Any of the extinct superfamily †Taeniolabidoidea of mammals.

taeniolabidoids
plural of taeniolabidoid

tainoceratid
Any in the family Tainoceratidae of extinct nautiloid cephalopods.

tainoceratids
plural of tainoceratid

talitroidean
Any amphipod of the superfamily Talitroidea

talitroideans
plural of talitroidean

tanaidomorph
Any crustacean of the suborder Tanaidomorpha

tanaidomorphs
plural of tanaidomorph

tangasaurid
Any diapsid in the family Tangasauridae.

tangasaurids
plural of tangasaurid

tanguile
dark-red Philippine mahogany, of species Rubroshorea polysperma (syn. Shorea polysperma), endemic to the Philippines.

tanninbush
A South African bush of the genus Osyris

tapacolo
Alternative form of tapaculo.

tapacolos
plural of tapacolo

tapaculo
Any of the family Rhinocryptidae of small suboscine passeriform birds found mainly in South America.

tapinocephalian
Any therapsid of the clade †Tapinocephalia

tapinocephalians
plural of tapinocephalian

taraxacology
The study of the dandelion genus Taraxacum.

tarbagan
Any of species Marmota sibirica of marmots that live on the steppes of Central Asia.

tarbagans
plural of tarbagan

tateril
Gerbil of the genus Taterillus.

taterils
plural of tateril

tawara
Any of the straw bales, packed with earth, placed in a circle on the dohyo and forming the area that the rikishi must stay inside.

taxiarchs
plural of taxiarch

taxocene
A taxonomically related set of species within a community.

taxocenes
plural of taxocene

taxocenose
A group of species having a similar taxonomic identity

taxocenoses
plural of taxocenose

taxonavigation
The navigation of a directory of species or other taxonomic entities.

teleosaur
Any of several species of marine crocodylomorphs belonging to Teleosauridae . They are similar to the modern-day gharial.

teleosaurid
A teleosaur.

teleosaurids
plural of teleosaurid

teleosaurs
plural of teleosaur

teleutosori
plural of teleutosorus

teleutospore
The thick-celled resting spore of the rusts (order Pucciniales).

teleutospores
plural of teleutospore

telonemid
Any single-celled eukaryote of the order Telonemida or the phylum Telonemia

telonemids
plural of telonemid

telsid
Any member of family Telsidae of crustaceans.

telsids
plural of telsid

tenericute
Any bacterium of the phylum Tenericutes

tenericutes
plural of tenericute

tennessium
A rejected name for tennessine

tentaculite
Any of numerous species of small, conical shells found in Paleozoic rocks, fossils from the extinct genus †Tentaculites.