An interface to the Integrated Taxonomic Information System (ITIS)
How to cite ITIS. From https://itis.gov/citation.html
To cite data obtained from ITIS, the following citation format is offered as a suggestion:
ITIS is one of many different taxonomic data sources. Other include: Catalogue of Life (and COL+), NCBI taxonomy, International Plant Names Index, Index Fungorum, and more. The Wikipedia entry (https://en.wikipedia.org/wiki/Integrated_Taxonomic_Information_System) states that ITIS has a North American focus, but includes many taxa not in North America.
Stable, CRAN version