@spiderdayNight A “oncer”. See https://t.co/Povmi8eI6h

@CMBuddle Maybe what you're looking for: impact of "rare" species & singletons in taxonomy - http://t.co/guIuJRRuUU & http://t.co/xYFCNacLIh

Found in taxonomic oncers paper http://t.co/735BSJHJ "There are ten times more ornithologists (~100,000) than species of bird"

Found in taxonomic oncers paper http://t.co/735BSJHJ "There are ten times more ornithologists (~100,000) than species of bird"

Found in taxonomic oncers paper http://t.co/735BSJHJ "There are ten times more ornithologists (~100,000) than species of bird"

Found in taxonomic oncers paper http://t.co/735BSJHJ "There are ten times more ornithologists (~100,000) than species of bird"

Found in taxonomic oncers paper http://t.co/735BSJHJ "There are ten times more ornithologists (~100,000) than species of bird"

@LauriLaanisto See http://t.co/eYhkwYdO. You may also be interested in this PLOS ONE paper on taxonomic uncertainty http://t.co/DFWYVwhp

13 à 22% des espèces animales décrites n'ont été observées qu'une seule fois ! http://t.co/8TJYeE91

Rare species in nature or the result of poor practice #PLOS: Significance of Species that have only been seen once. http://t.co/uT2nsOyH

#PLOS: The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus... http://t.co/vWKOAWz7

Very interesting article. "@MicrobiologyNet: 13-22% (depending on taxonomic group) of species only observed once. http://t.co/nYA8ZqeA"

13% to 22% (depending on taxonomic group) of described species have only ever been observed once. http://t.co/qxK01IWp

The Taxonomic Significance of Species That Have Only Been Observed Once http://t.co/0x4M0gid

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

RT @PLOSONE: MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/5pu1FT4V #deepsn

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

The '20-30% spp only observed once' claim here http://t.co/WSoRjgwv is actually a citation of this: http://t.co/z5d8XHrf

13 to 22% of all species have only been observed once by scientists. http://t.co/JPLMsxep

I've never heard the term "Oncers" for rare species. Is this well-used in protistology @PsiWavefunction @Paraphyso? http://t.co/dc45DxtP

RT @edyong209: Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/dh0rH99j

RT @edyong209: Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/3X7XHBAt

RT @edyong209: Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/hS5wqIzL

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

Étonnant... RT @dessouscience: 13 à 22% des espèces animales décrites n'ont été observées qu'une seule fois ! http://t.co/vClLAoNh

Étonnant... RT @dessouscience: 13 à 22% des espèces animales décrites n'ont été observées qu'une seule fois ! http://t.co/vClLAoNh

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists. http://t.co/GwDhCJzO

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

MT @carlzimmer: 13 to 22% of all described species have only been observed once by scientists http://t.co/HT6MSyO5

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Now you see it, now you don't. Surprisingly large number of species observed only once. http://t.co/rkAHw0sd #biodiversity via @PLOSONE

13% to 22% (depending on taxonomic group) of all species have only ever been observed once http://t.co/gkW9vgd7

RT @ pbump Between an eighth and a fifth of described species on Earth have only been observed once. http://t.co/BgG6Q548 via @carlzimmer

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

RT @carlzimmer 13 to 22% of all species have only been observed once by scientists. http://t.co/1ViCW0Ex

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

Between an eighth and a fifth of described species on Earth have only been observed once. http://t.co/1KTwUI5f via @carlzimmer

Between an eighth and a fifth of described species on Earth have only been observed once. http://t.co/1KTwUI5f via @carlzimmer

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

#PLOS: The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus... http://t.co/GNtfYiw1

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

RT @tcarmody RT @carlzimmer: 13 to 22% of all species have only been observed once by scientists. http://t.co/bZxUsecP

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

I agree 'oncers' are likely v. common, but '13-22%' being reported as fact from this 2ndary source http://t.co/WSoRjgwv

BTW I'm questioning lazy reporting, not this paper http://t.co/WSoRjgwv which looks like an excellent and thorough study of dinoflagellates!

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

I agree 'oncers' are likely v. common, but '13-22%' being reported as fact from this 2ndary source http://t.co/WSoRjgwv

The '20-30% spp only observed once' claim here http://t.co/WSoRjgwv is actually a citation of this: http://t.co/z5d8XHrf

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

Amazing if true: It's been estimated that 13-22% of all known species have only been observed once. http://t.co/mj1aK5KU (via @carlzimmer)

MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/Ngx1usFp via @edyong209

MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/Ngx1usFp via @edyong209

#PLOS: The Taxonomic Significance of Species That Have Only Been Observed Once: http://t.co/3fwOwhS7

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

Whoah MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/OPPeJtRe

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/Ngx1usFp via @edyong209

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

Mind blown MT @carlzimmer: 13 to 22% of all known species have only been observed once by scientists. http://t.co/FY6Nk5hB

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

insane “@carlzimmer: 13 to 22% of all species have only been observed once by scientists. http://t.co/D5yFevEG”

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

this blows my mind. “@carlzimmer: 13 to 22% of all species have only been observed once by scientists. http://t.co/dHeXKdQx”

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

13 to 22% of all species have only been observed once by scientists. http://t.co/wiPjDNmS

#PLOS: The Taxonomic Significance of Species That Have Only Been Observed Once: The Genus... http://t.co/JUeeDDb3