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Photo © Guy Harvey Research Institute

Photo © Guy Harvey Research Institute

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Photo © Matt Potensky

Photo © Matt Potensky

Shark species in the IUCN Red List under the category "DD"

DD

Data Deficient

A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a taxon is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified.

Categories of the Red List Criteria

Species

The search for the Red List category "Data Deficient" resulted in 76 of hits on 4 pages.

1 2 3 4

The search for the Red List category "Data Deficient" resulted in 76 of hits on 4 pages.

1 2 3

Name

Category

Categories

Criteria

Last
Evaluation
(Last
Seen)

Trend

Ambon catshark

DD

DD -

-

2020
Anna’s sixgill sawshark

DD

DD -

-

2020
Apristurus bucephalus

DD

DD -

-

2015
Arabian catshark

DD

DD -

-

2017
Atelomycterus marnkalha

DD

DD -

-

2015
Atlantic lobefin dogfish

DD

DD -

-

2020
Bach's Catshark

DD

DD -

-

2019
Barblethroat carpetshark

DD

DD -

-

2020
Bighead spurdog

DD

DD -

-

2018
Blacktailed spurdog

DD

DD -

-

2018
Blotched catshark

DD

DD -

-

2016
Bluespotted bambooshark

DD

DD -

-

2021
Brazilian whitetail dogfish

DD

DD -

-

2020
Broadhead catshark

DD

DD -

-

2019
Brown catshark

DD

DD -

-

2015
Brown catshark

DD

DD -

-

2019
Bythaelurus incanus

DD

DD -

-

2015
Cailliet's Angelshark

DD

DD -

-

2019
Carolina hammerhead

DD

DD -

-

2020
Centrophorus westraliensis

DD

DD -

-

2024

The search for the Red List category "Data Deficient" resulted in 76 of hits on 4 pages.

1 2 3 4

The search for the Red List category "Data Deficient" resulted in 76 of hits on 4 pages.

1 2 3

© IUCN Red List 2025. The IUCN Red List of Threatened Species: Version 2025-1.

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