radiolarians
plural of radiolarian

radiozoan
Synonym of radiolarian.

radiozoans
plural of radiozoan

rambung
A rubber fig of species (Ficus elastica).

ramet
A clone (individual member of a genet).

ramets
plural of ramet

ramoconidium
An intercalary or apical branch of a conidiophore that detaches and functions as a conidium

rangeomorph
Any organism of the clade Rangeomorpha, Precambrian (Ediacaran) sessile organisms resembling ferns, possibly descended from sponges and among the oldest known complex lifeforms.

rangeomorphs
plural of rangeomorph

raphidiid
Any snakefly of the family Raphidiidae.

raphidiids
plural of raphidiid

rayadito
Either of the two species of ovenbirds in the genus Aphrastura, native to southern South America.

rayaditos
plural of rayadito

recapitulationism
The doctrine that during embryonic development various structures develop that appeared during the evolutionary history of the species.

receptaculitid
A probably benthic marine calcareous dasyclad known only from fossils.

receptaculitids
plural of receptaculitid

replichore
A replicated half of a chromosome in some bacteria

replichores
plural of replichore

reptantian
Any decapod of the clade Reptantia.

reptantians
plural of reptantian

reptiliomorph
Any tetrapod of the clade Reptiliomorpha

reptiliomorphs
plural of reptiliomorph

resomiid
Any siphonophore of the family Resomiidae

resomiids
plural of resomiid

respirofermentation
Simultaneous respiration and fermentation, typically in bacteria or yeasts

retroleptomonad
A leptomonad formed by reverse metacyclogenesis

retroplasmid
Any plasmid that replicates via reverse transcription

retroplasmids
plural of retroplasmid

retrotransposon
A transposable fragment of a genome that can undergo retrotransposition.

retrotransposons
plural of retrotransposon

rhabdopleurid
Any hemichordate in the family Rhabdopleuridae.

rhabdopleurids
plural of rhabdopleurid

rhadinovirus
Any of the genus Rhadinovirus of herpesviruses,.

rhadinoviruses
plural of rhadinovirus

rhamnoxanthin
Synonym of frangulin.

rhaphoneidacean
Any diatom of the family Rhaphoneidaceae

rhaphoneidaceans
plural of rhaphoneidacean

rhenanid
Any placoderm of the order †Rhenanida

rhenanids
plural of rhenanid

rheobiont
Any organism that lives in fast-flowing water

rheobionts
plural of rheobiont

rheophil
Alternative form of rheophile.

rheophile
Any organism that thrives in the presence of running water.

rheophiles
plural of rheophile

rheophils
plural of rheophil

rhinebothriidean
Any tapeworm of the order Rhinebothriidea

rhinebothriideans
plural of rhinebothriidean

rhinesuchid
Any temnospondyl in the family Rhinesuchidae.

rhinesuchids
plural of rhinesuchid

rhinocerotoid
Any ungulate of the superfamily Rhinocerotoidea

rhinocerotoids
plural of rhinocerotoid

rhizarian
Any organism of the taxon Rhizaria

rhizarians
plural of rhizarian

rhizavidin
An avidin dimer present in Rhizobium bacteria

rhizophore
The structure bearing the true roots in certain species of Selaginella.

rhizophores
plural of rhizophore

rhodaliid
Any siphonophore of the family Rhodaliidae

rhodaliids
plural of rhodaliid

rhodology
A branch of botany that studies the genus Rosa of roses.

rhombosortase
Any rhomboid sortase (present in many bacteria)

rhombosortases
plural of rhombosortase

rhombozoan
Any of the phylum Rhombozoa of tiny parasites found in the renal appendages of cephalopods.

rhombozoans
plural of rhombozoan

rhopaloneme
Any hydrozoan of the genus Rhopalonema

rhopalonemes
plural of rhopaloneme

rhusflavanone
A particular biflavonoid found in Rhus species.

rhusflavone
A particular biflavonoid found in Rhus species.

rhynchopid
Any skimmer in the family Rynchopidae.

rhynchopids
plural of rhynchopid

riboplasm
The part of an anammox bacterium that holds the chromosome, ribosomes and anammoxosome; it is surrounded by the paryphoplasm that is analogous to the periplasm that surrounds the cytoplasm in Gram-negative bacteria

riboplasms
plural of riboplasm

ribospecies
A species identified or characterized by ribotyping

ringleist
A ridge on the frustule of Aulacoseiraceae species.

ringleists
plural of ringleist

rishathra
Sex between any two (or more) humanoids of different species.

rissoid
Any of the spiral-shaped gastropods of the family Rissoidae, especially those of the genus Rissoa.

rissoids
plural of rissoid

riverdamsel
Any of various Australia damselflies of the genus Pseudagrion (of which African species are named sprites).

riverdamsels
plural of riverdamsel

robinetin
A flavone with the molecular formula C₁₅H₁₀O₇, found in the genus Robinia.

robotkind
Robots collectively, regarded as a species.

romidepsin
An anticancer agent obtained from the bacterium Chromobacterium violaceum.

rondeletiid
Any whalefish in the family Rondeletiidae.

rondeletiids
plural of rondeletiid

roseobacter
Any proteobacterium of the genus Roseobacter.

roseobacteria
plural of roseobacterium

roseobacterium
Any bacterium of the genus Roseobacter

roseobacters
plural of roseobacter

rotaliid
Any foraminiferan of the order Rotaliida

rotaliids
plural of rotaliid

rotulid
Any sand dollar in the family Rotulidae

rotulids
plural of rotulid

rubyspot
Any of several damselflies of the genus Hetaerina

ruminococci
plural of ruminococcus

ruminococcus
Any bacterium of the genus Ruminococcus.

ruminotype
Any of several distinct types of bacteria that inhabit the rumen of an animal

ruminotypes
plural of ruminotype

rusot
Alternative form of ruswut.

ruswut
An inspissated extract from the wood and roots of various berberis species, used in medicine.

saccharibacteria
plural of saccharibacterium

saccharibacterium
Any bacterium of the candidate phylum Saccharibacteria

saccopharyngid
Any in the family Saccopharyngidae of gulper eels.

saccopharyngids
plural of saccopharyngid

sacculinid
Any of the family Sacculinidae, parasitic barnacles in the superorder Rhizocephala.

sacculinids
plural of sacculinid

sakobuvirus
Any picornavirus of the genus Sakobuvirus

sakobuviruses
plural of sakobuvirus

saksaul
Alternative form of saxaul.

saksauls
plural of saksaul

salpichrolide
A withanolide obtained from Salpichroa species.

salpichrolides
plural of salpichrolide

saltationism
The belief that evolution operates by the sudden development of new species or biological features from one generation to the next.

sandroach
A member of family Corydiidae, of mostly desert-dwelling cockroaches.

sapienization
The development of Homo sapiens (the modern human being) from earlier species.

saprophyte
Any organism that lives on dead organic matter, as certain fungi and bacteria.

saprophytes
plural of saprophyte

saprovore
Any organism that feeds on detritus

saprovores
plural of saprovore

sarcocyst
Any protozoan of the genus Sarcocystis.

sarcocystid
Any apicomplexan in the family Sarcocystidae

sarcocystids
plural of sarcocystid

sarcocysts
plural of sarcocyst

sarcosporidian
Alternative form of sarcocystid.

sarcosporidians
plural of sarcosporidian

sarpat
Any of several species of sugarcane or sugarcane-like grasses found in India, of the genera Saccharum and Tripidium.
The leaf of such a plant.

satyrisation
Alternative spelling of satyrization.

satyrization
The situation where interspecific (interspecies) mating fails to produce hybrids and thus reduces the fitness of the species involved.

satyrizations
plural of satyrization

saucrosmylid
Any lacewing of the family Saucrosmylidae.

saucrosmylids
plural of saucrosmylid

saxaul
Either of two species of the amaranth genus Haloxylon: Haloxylon ammodendron (syn. Haloxylon aphyllum; black saxaul) and Haloxylon persicum (white saxaul), found in sandy habitats from Egypt to Mongolia and China.

saxauls
plural of saxaul

saxoguattine
An aminoethylbenzil found in Guatteria species.

scalidophoran
Any organism of the clade Scalidophora.

scalidophorans
plural of scalidophoran

scaphitid
An ammonite from the Scaphitidae taxonomic family.