How many species are there on Earth? Progress and problems

Open Access

The Perspective section provides experts with a forum to comment on topical or controversial issues of broad interest.

About the Authors

John J. Wiens

* E-mail: wiensj@arizona.edu

Affiliation Department of Ecology and Evolutionary Biology, The University of Arizona, Tucson, Arizona, United States of America

The authors have declared that no competing interests exist.

Cryptic speciation
Is the Subject Area "Cryptic speciation" applicable to this article?

Thanks for your feedback.
Insects
Is the Subject Area "Insects" applicable to this article?

Thanks for your feedback.
Biodiversity
Is the Subject Area "Biodiversity" applicable to this article?

Thanks for your feedback.
Species diversity
Is the Subject Area "Species diversity" applicable to this article?

Thanks for your feedback.
Fungi
Is the Subject Area "Fungi" applicable to this article?

Thanks for your feedback.
Protists
Is the Subject Area "Protists" applicable to this article?

Thanks for your feedback.
Earth
Is the Subject Area "Earth" applicable to this article?

Thanks for your feedback.
Extrapolation
Is the Subject Area "Extrapolation" applicable to this article?

Thanks for your feedback.