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IUCN species-conservation category
data deficient species List of data deficient amphibians List of data deficient arthropods List of data deficient birds IUCN Red List data deficient species
Data_deficient
species Data deficient (DD): 5,492 species In September 2016, the International Union for Conservation of Nature (IUCN) listed 3191 data deficient fish species
List_of_data_deficient_fishes
Protista) data deficient species. Lists of data deficient species Animals Amphibians — List of data deficient amphibians Birds — List of data deficient birds
Lists of IUCN Red List data deficient species
Lists_of_IUCN_Red_List_data_deficient_species
species Data deficient (DD): 789 species In September 2016, the International Union for Conservation of Nature (IUCN) listed 783 data deficient mammalian
List of data deficient mammals
List_of_data_deficient_mammals
species Data deficient (DD): 896 species As of December 2025, the International Union for Conservation of Nature (IUCN) lists 896 data deficient amphibian
List of data deficient amphibians
List_of_data_deficient_amphibians
species Data deficient (DD): 4,644 species As of July 2016, the International Union for Conservation of Nature (IUCN) lists 5278 data deficient invertebrate
List of data deficient invertebrates
List_of_data_deficient_invertebrates
species Data deficient (DD): 1,502 species As of September 2016, the International Union for Conservation of Nature (IUCN) lists 910 data deficient reptile
List of data deficient reptiles
List_of_data_deficient_reptiles
Near threatened (NT): 0 species Least concern (LC): 0 species Data deficient (DD): 12 species As of September 2021[update], the International Union
List of Chromista by conservation status
List_of_Chromista_by_conservation_status
species Data deficient (DD): 2,229 species In September 2016, the International Union for Conservation of Nature (IUCN) listed 1988 data deficient mollusc
List of data deficient molluscs
List_of_data_deficient_molluscs
Species categorized as likely to become extinct
latest system used by the IUCN, a species can be "Data Deficient" (DD) species – species for which more data and assessment is required before their situation
Endangered species (IUCN status)
Endangered_species_(IUCN_status)
species Data deficient (DD): 3,255 species In July 2016, the International Union for Conservation of Nature (IUCN) listed 1702 data deficient insect species
List of data deficient insects
List_of_data_deficient_insects
species Data deficient (DD): 6,317 species As of September 2016, the International Union for Conservation of Nature (IUCN) lists 1674 data deficient plant
List_of_data_deficient_plants
Inventory of the global conservation status of biological species
Earth are known to be threatened with extinction, and 836 are listed as Data Deficient. The Red List of 2012 was released 19 July 2012 at Rio+20 Earth Summit;
IUCN_Red_List
species Data deficient (DD): 4,643 species As of July 2016, the International Union for Conservation of Nature (IUCN) lists 2875 data deficient arthropod
List of data deficient arthropods
List_of_data_deficient_arthropods
IUCN conservation category
Conservation Dependent (CD) (list) Least Concern (LC) (lists) Other categories Data Deficient (DD) (lists) Not Evaluated (NE) Related topics International Union for
Least-concern_species
IUCN conservation category
Concern Data Deficient WP categories Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient CITES
Vulnerable_species
International list of biodiversity conservation priorities
or disruption of biotic processes and interactions). An ecosystem is Data Deficient when there is inadequate information to make a direct, or indirect,
IUCN_Red_List_of_Ecosystems
species Data deficient (DD): 37 species As of June 2026, the International Union for Conservation of Nature (IUCN) lists 36 data deficient avian species
List_of_data_deficient_birds
threatened (NT): 967 species Least concern (LC): 8,767 species Data deficient (DD): 37 species In December 2019, the International Union for Conservation
List_of_endangered_birds
IUCN conservation category
Concern Data Deficient WP categories Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient CITES
Critically_endangered
threatened (NT): 967 species Least concern (LC): 8,767 species Data deficient (DD): 37 species As of December 2019, the International Union for Conservation
List of critically endangered birds
List_of_critically_endangered_birds
Species of some organisms facing a very high risk of extinction
Widespread and abundant taxa are included in this category. Data deficient (DD) – Not enough data to make an assessment of its risk of extinction Not evaluated
Endangered_species
threatened (NT, LR/cd): 4,880 species Least concern (LC): 35,732 species Data deficient (DD): 6,317 species As of September 2016, the International Union for
List of recently extinct plants
List_of_recently_extinct_plants
threatened (NT): 401 species Least concern (LC): 3,391 species Data deficient (DD): 789 species As of February 2026, the International Union for Conservation
List of critically endangered mammals
List_of_critically_endangered_mammals
January 2010, the IUCN Red List of Threatened Species identified 149 data deficient species in the Cnidaria phylum (Animalia kingdom). Acropora akajimensis
IUCN Red List data deficient species (Cnidaria)
IUCN_Red_List_data_deficient_species_(Cnidaria)
threatened (NT, LR/cd): 1,042 species Least concern (LC): 18,621 species Data deficient (DD): 5,492 species As of July 2017, the International Union for Conservation
List of critically endangered fishes
List_of_critically_endangered_fishes
threatened (NT, LR/cd): 1,042 species Least concern (LC): 18,621 species Data deficient (DD): 5,492 species As of September 2016, the International Union for
List of recently extinct fishes
List_of_recently_extinct_fishes
threatened (NT, LR/cd): 566 species Least concern (LC): 6,406 species Data deficient (DD): 1,502 species As of September 2016, the International Union for
List of recently extinct reptiles
List_of_recently_extinct_reptiles
Indication of the chance of extinction
Widespread and abundant taxa are included in this category. Data deficient (DD) – Not enough data to make an assessment of its risk of extinction Not evaluated
Conservation_status
threatened (NT, LR/cd): 1,042 species Least concern (LC): 18,621 species Data deficient (DD): 5,492 species In September 2016, the International Union for Conservation
List_of_endangered_fishes
Species of fish
causing them to be easy to harpoon. It is classified under the IUCN as "Data Deficient" due to a lack of detailed information about population developments
Arapaima_gigas
threatened (NT): 453 species Least concern (LC): 3,733 species Data deficient (DD): 896 species As of December 2025, the International Union for Conservation
List_of_endangered_amphibians
threatened (NT, LR/cd): 897 species Least concern (LC): 6,802 species Data deficient (DD): 3,255 species As of July 2016, the International Union for Conservation
List of recently extinct insects
List_of_recently_extinct_insects
Species of spider
Steatoda nobilis Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Arthropoda Subphylum: Chelicerata Class:
Steatoda_nobilis
IUCN conservation category
Species that have not been evaluated (NE), or do not have sufficient data (data deficient) also are not considered "threatened" by the IUCN. Although threatened
Threatened_species
threatened (NT, LR/cd): 4,880 species Least concern (LC): 35,732 species Data deficient (DD): 6,317 species As of December 2023, the International Union for
List of critically endangered plants
List_of_critically_endangered_plants
January 2010, the IUCN Red List of Threatened Species identified three data deficient species in the Nemertina phylum (Animalia kingdom). Argonemertes stocki
IUCN Red List data deficient species (Nemertina)
IUCN_Red_List_data_deficient_species_(Nemertina)
Species of fish
stones. Atlantic wolffish mature relatively late, at age six. According to data compiled by the National Marine Fisheries Service, since 1983, the landings
Atlantic_wolffish
threatened (NT): 453 species Least concern (LC): 3,733 species Data deficient (DD): 896 species The International Union for Conservation of Nature
List of recently extinct amphibians
List_of_recently_extinct_amphibians
threatened (NT, LR/cd): 1,119 species Least concern (LC): 8,632 species Data deficient (DD): 4,644 species As of July 2016, the International Union for Conservation
List of critically endangered invertebrates
List_of_critically_endangered_invertebrates
Species of fish
this fish as Data Deficient, which means that it views the proper conservation status of this species to be undetermined due to a lack of data. Juvenile
Asian_sheephead_wrasse
threatened (NT, LR/cd): 1,042 species Least concern (LC): 18,621 species Data deficient (DD): 5,492 species In September 2016, the International Union for Conservation
List_of_vulnerable_fishes
endangered, vulnerable, near threatened, least concern, disappeared, data deficient and not evaluated. The Aulopiformes, or grinners, are marine fish, most
List_of_fishes_of_Sweden
threatened (NT, LR/cd): 4,880 species Least concern (LC): 35,732 species Data deficient (DD): 6,317 species As of June 2026, the International Union for Conservation
List of plants that are extinct in the wild
List_of_plants_that_are_extinct_in_the_wild
(LC) Lower Risk (LR) Conservation Dependent (LR/cd) Not fully assessed Data Deficient (DD) Not Evaluated (NE) Species Lists Extinct Extinct in the Wild Critically
Lists of IUCN Red List critically endangered species
Lists_of_IUCN_Red_List_critically_endangered_species
threatened (NT): 453 species Least concern (LC): 3,733 species Data deficient (DD): 896 species As of December 2025, the International Union for Conservation
List of critically endangered amphibians
List_of_critically_endangered_amphibians
IUCN Red List category
of the spectrum, to least concern (LC) at the other. The categories data deficient and not evaluated (NE) are not on the spectrum, because they indicate
Not_evaluated
threatened (NT): 401 species Least concern (LC): 3,391 species Data deficient (DD): 789 species In September 2016, the International Union for Conservation
List_of_endangered_mammals
threatened (NT, LR/cd): 566 species Least concern (LC): 6,406 species Data deficient (DD): 1,502 species In September 2016, the International Union for Conservation
List_of_endangered_reptiles
Species of marine fish
evolutionary history of the ruby seadragon. The ruby seadragon is listed as "Data Deficient" on the IUCN Red List after its 2015 assessment. This justification
Ruby_seadragon
threatened (NT, LR/cd): 897 species Least concern (LC): 6,802 species Data deficient (DD): 3,255 species In July 2017, the International Union for Conservation
List_of_endangered_insects
threatened (NT, LR/cd): 1,118 species Least concern (LC): 8,632 species Data deficient (DD): 4,643 species As of September 2016, the International Union for
List of recently extinct arthropods
List_of_recently_extinct_arthropods
threatened (NT): 453 species Least concern (LC): 3,733 species Data deficient (DD): 896 species As of December 2025, the International Union for Conservation
List_of_vulnerable_amphibians
Species of hyena
London: Trustees of the British Museum (Natural History). ISBN 0-565-00723-8. Data related to Hyaena hyaena at Wikispecies Media related to Hyaena hyaena at
Striped_hyena
threatened (NT, LR/cd): 897 species Least concern (LC): 6,802 species Data deficient (DD): 3,255 species As of July 2016, the International Union for Conservation
List of critically endangered insects
List_of_critically_endangered_insects
threatened (NT, LR/cd): 1,118 species Least concern (LC): 8,632 species Data deficient (DD): 4,643 species As of July 2016, the International Union for Conservation
List of critically endangered arthropods
List_of_critically_endangered_arthropods
2012 report by IUCN SSC
Concern Data Deficient WP categories Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient CITES
The world's 100 most threatened species
The_world's_100_most_threatened_species
Species of rodent
Lesser capybara In Gamboa, Panama Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia
Lesser_capybara
Species of armadillo
conservation status of pink fairy armadillos is uncertain, and it is listed as Data Deficient by the IUCN Red List of Threatened Species. The decline in population
Pink_fairy_armadillo
Species of fish
Common sole Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Carangiformes
Common_sole
Species of hornet
relationship to other species of the genus Vespa, based on morphological data alone. Thus, only recently has the use of molecular phylogenetics given evidence
Oriental_hornet
Extinct species of flowering plant
Hernandia drakeana Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade:
Hernandia_drakeana
Species of arthropod
Mangrove horseshoe crab Conservation status Data Deficient (IUCN 2.3) Scientific classification Kingdom: Animalia Phylum: Arthropoda Subphylum: Chelicerata
Mangrove_horseshoe_crab
Evergreen tree, source of nutmeg and mace
Myristica fragrans Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade:
Myristica_fragrans
Species of fish
Ayu sweetfish Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Osmeriformes
Ayu_sweetfish
Concern Data Deficient WP categories Extinct Extinct in the Wild Critically Endangered Endangered Vulnerable Near Threatened Least Concern Data Deficient CITES
List of endangered plants of North America
List_of_endangered_plants_of_North_America
Species of arthropod
pelecypods, annelids, and polychaetes. Tachypleus gigas is listed as Data Deficient on the IUCN Red List. Tachypleus gigas was first described by Otto Friedrich
Tachypleus_gigas
Species of tree
Catalpa bignonioides Conservation status Data Deficient (IUCN 3.1) Apparently Secure (NatureServe) Scientific classification Kingdom: Plantae Clade: Embryophytes
Catalpa_bignonioides
threatened (NT, LR/cd): 566 species Least concern (LC): 6,406 species Data deficient (DD): 1,502 species In September 2016, the International Union for Conservation
List_of_vulnerable_reptiles
threatened (NT, LR/cd): 1,118 species Least concern (LC): 8,632 species Data deficient (DD): 4,643 species In July 2016, the International Union for Conservation
List_of_vulnerable_arthropods
thirteen as near threatened, fifty-eight as of least concern, and two as data deficient. According to statistics accompanying the 2020 Japanese Ministry of
List_of_reptiles_of_Japan
endangered, three are vulnerable, two are near threatened and four are data deficient. Only seven of these species are fully terrestrial. Introduced species
List_of_mammals_of_Greenland
threatened (NT, LR/cd): 566 species Least concern (LC): 6,406 species Data deficient (DD): 1,502 species As of June 2026, the International Union for Conservation
List of critically endangered reptiles
List_of_critically_endangered_reptiles
Species of plant
Alisma gramineum Conservation status Data Deficient (IUCN 3.1) Secure (NatureServe) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade:
Alisma_gramineum
Species of fish
grouper Giant grouper at Ripley's Aquarium of Canada Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata
Giant_grouper
Species of flowering plant
Epic Gardening. Media related to Zingiber zerumbet at Wikimedia Commons Data related to Zingiber zerumbet at Wikispecies Details on Zingiber zerumbet
Zingiber_zerumbet
Species of fish
Indo-Pacific king mackerel Conservation status Data Deficient (IUCN 3.1) Least Concern (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata
Indo-Pacific_king_mackerel
Suborder of fishes
some other species is poorly known, leading to their being listed as data deficient. Stingrays diverged from their closest relatives, the panrays, during
Stingray
Species of fish
seahorse is classified as Near Threatened in the Mediterranean and Data Deficient in Croatia. In Europe, this species is normally caught as bycatch and
Short-snouted_seahorse
Tropical evergreen tree with edible fruit
in the US and Canada only – see table for canned fruit in syrup, USDA FoodData Central; note that nutrient values for fresh fruit are likely different,
Mangosteen
Species of beaked whale
species' IUCN Red List conservation status is "Data Deficient (DD)" due to lack of information and uncertain data. NMNZ 546 – 1872; Pitt Island specimen, apparently
Spade-toothed_whale
Species of plum
Prunus cerasifera Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade:
Prunus_cerasifera
(LC) Lower Risk (LR) Conservation Dependent (LR/cd) Not fully assessed Data Deficient (DD) Not Evaluated (NE) Species Lists Extinct Extinct in the Wild Critically
List_of_endangered_spiders
threatened (NT, LR/cd): 823 species Least concern (LC): 3,526 species Data deficient (DD): 2,229 species As of February 2021, the International Union for
List of recently extinct molluscs
List_of_recently_extinct_molluscs
(LC) Lower Risk (LR) Conservation Dependent (LR/cd) Not fully assessed Data Deficient (DD) Not Evaluated (NE) Species Lists Extinct Extinct in the Wild Critically
Lists of IUCN Red List vulnerable species
Lists_of_IUCN_Red_List_vulnerable_species
Species of snake
Hydrophis belcheri Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: Squamata
Hydrophis_belcheri
Species of flowering plant in the mint family Lamiaceae
Vitex agnus-castus Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes Clade:
Vitex_agnus-castus
Index of animals with the same common name
Red List of Threatened Species — also known as the 'IUCN Red List' or 'Red Data Book' — inventory of the global conservation status and extinction risk of
Terrapin
threatened (NT): 453 species Least concern (LC): 3,733 species Data deficient (DD): 896 species As of December 2025, the International Union for Conservation
List of least concern amphibians
List_of_least_concern_amphibians
IUCN conservation category
Conservation Dependent (CD) (list) Least Concern (LC) (lists) Other categories Data Deficient (DD) (lists) Not Evaluated (NE) Related topics International Union for
Near-threatened_species
Species of plant
emarginata Close-up of the blossom and unripe fruit Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes
Malpighia_emarginata
Species of tree
Natural forest of Platanus orientalis in Armenia Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes
Platanus_orientalis
threatened (NT, LR/cd): 1,042 species Least concern (LC): 18,621 species Data deficient (DD): 5,492 species In September 2016, the International Union for Conservation
List of near threatened fishes
List_of_near_threatened_fishes
Species of fish
Pleistocene to present PreꞒ Ꞓ O S D C P T J K Pg N Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata
John_Dory
threatened (NT): 401 species Least concern (LC): 3,391 species Data deficient (DD): 789 species In September 2016, the International Union for Conservation
List_of_vulnerable_mammals
Species of ray-finned fish
Indian mackerel Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order:
Indian_mackerel
Species of flowering plant
Hedychium coronarium Conservation status Data Deficient (IUCN 3.1) Scientific classification Kingdom: Plantae Clade: Embryophytes Clade: Tracheophytes
Hedychium_coronarium
Species of cephalopod known as the flapjack octopus
was also planning on describing this species. Recent work using molecular data, ROV observations, and Hochberg's unpublished descriptions indicate that
Opisthoteuthis_californiana
Species of flowering plant
ISBN 0-394-50760-6. Wikimedia Commons has media related to Prunus domestica. Data related to Prunus domestica at Wikispecies "Prunus domestica". Plants for
Prunus_domestica
endangered or special concern. The Atlantic population is considered data deficient. Populations are Blue- or Red-Listed On mainland only Some debate remains
List_of_mammals_of_Canada
DATA DEFICIENT
DATA DEFICIENT
Male
English
English surname transferred to unisex forename use, possibly DANA means "from Denmark."
Girl/Female
Hindu
A creeper
Female
Hungarian
 Short form of Hungarian Katalin, KATA means "pure." Compare with other forms of Kata.
Female
Hindi/Indian
(लता) Hindi name derived from a plant name, from the Sanskrit word lata, LATA means "creeper," in reference to a creeping plant.
Male
Hebrew
(דֶּרַע) Hebrew name DARA means "the arm." In the bible, this is the name of a son of Zerah. Compare with other forms of Dara.
Female
English
 Middle English name DARA means "brave, daring." Compare with another form of Dara.
Female
Finnish
 Short form of Finnish Katariina, KATA means "pure." Compare with other forms of Kata.
Female
Finnish
Variant form of Finnish Aada, AATA means "noble."
Female
English
 English surname transferred to unisex forename use, possibly DANA means "from Denmark." Compare with other forms of Dana.
Female
Hebrew
(דִּיתָה) Pet form of Hebrew Yehuwdiyth, DITA means "Jewess" or "praised." Compare with another form of Dita.
Female
Polish
 Variant spelling of Polish Dyta, DITA means "rich battle." Compare with another form of Dita.
Female
Russian
 Short form of Russian Yekaterina, KATA means "pure." Compare with other forms of Kata.
Male
Turkish
Turkish name ATA means "ancestor."
Male
Iranian/Persian
 Short form of Persian Dârayavahush, DARA means "possesses a lot, wealthy." Compare with other forms of Dara.
Female
Hebrew
(×“Ö¼Ö¸× Ö¸×”) Feminine form of Hebrew Dan, DANA means "judge." Compare with other forms of Dana.
Male
Irish
 From Irish Gaelic Mac Dara, DARA means "son of oak." Compare with other forms of Dara.
Male
Hebrew
Variant spelling of Hebrew Dathan, DATAN means "belonging to a fountain."
Male
Irish
Irish Gaelic name MAC DARA means "son of oak." This is the name of a patron saint and is still common in Ireland, especially in Connemara.
Female
Slavic
 Short form of Slavic Bogdana, DANA means "gift from God." Compare with other forms of Dana.
Female
Polish
Short form of Polish Edyta, DYTA means "rich battle."
DATA DEFICIENT
DATA DEFICIENT
Male
Czechoslovakian
, ruler of glory.
Boy/Male
German, Scottish
Red
Boy/Male
Hindu
Boy/Male
Indian
Servant of the responsive, Servant of the answerer
Male
Scandinavian
 Scandinavian form of Icelandic Jóhann, JON means "God is gracious." Compare with other forms of Jon.
Girl/Female
Biblical
Declaring a message, marrow.
Male
Irish
Irish Gaelic form of English Geoffrey, probably SÉAFRA means "God's peace."Â
Boy/Male
Assamese, Bengali, Hindu, Indian, Kannada, Telugu
Ramadhutha
Boy/Male
Hindu, Indian
Cupid or Follower of Lord Shiva
Girl/Female
English Latin
DATA DEFICIENT
DATA DEFICIENT
DATA DEFICIENT
DATA DEFICIENT
DATA DEFICIENT
n.
Death; decease; the date of one's death.
n.
A New Zealand forest tree (Metrosideros robusta), also, its hard dark red wood, used by the Maoris for paddles and war clubs.
pl.
of Datum
n.
Given or assigned length of life; dyration.
a.
Erroneous in date; containing an anachronism.
n. pl.
See Datum.
a.
Being out of date; antiquated.
v. i.
To have beginning; to begin; to be dated or reckoned; -- with from.
n.
Prior date; a date antecedent to another which is the actual date.
p. pr. & vb. n.
of Date
n.
That addition to a writing, inscription, coin, etc., which specifies the time (as day, month, and year) when the writing or inscription was given, or executed, or made; as, the date of a letter, of a will, of a deed, of a coin. etc.
v. t.
To note the time of writing or executing; to express in an instrument the time of its execution; as, to date a letter, a bond, a deed, or a charter.
n.
Assigned end; conclusion.
n.
The fruit of the date palm; also, the date palm itself.
n.
The point of time at which a transaction or event takes place, or is appointed to take place; a given point of time; epoch; as, the date of a battle.
v. t.
To date erroneously.
imp. & p. p.
of Date
v. t.
To note or fix the time of, as of an event; to give the date of; as, to date the building of the pyramids.
a.
Without date; having no fixed time.