About the Authors
- Rebecca Fay Johnson
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* E-mail: rjohnson@calacademy.org
Affiliation Department of Invertebrate Zoology and Geology, California Academy of Sciences, San Francisco, California, United States of America,
- Terrence M. Gosliner
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: RFJ TMG. Performed the experiments: RFJ. Analyzed the data: RFJ. Contributed reagents/materials/analysis tools: TMG. Wrote the paper: RFJ. Conceptualized and wrote the new classification: TMG RFJ.