Bats of the World

A Taxonomic and Geographic Database

Compiled and Edited by:
Nancy B. Simmons and Andrea L. Cirranello
American Museum of Natural History

Your search for Myotis extremus resulted in 1 species-level match:

Myotis Kaup, 1829. Skizz. Entwickel.-Gesch. Nat. Syst. Europ. Thierwelt 1: 106.

Vespertilio myotis Borkhausen, 1797

Myotis extremus Miller & Allen, 1928.
Bull. U.S. Natl. Mus. 144: VI, 11, 181.
Mexican Black Myotis

Mexico, Chiapas, Huehuetán

SE and S Mexico, Guatemala

CITES - Not listed (under Myotis nigricans) IUCN - Not Evaluated (raised from synonymy).

Previously considered a subspecies of Myotis nigricans, but clearly distinct; see Novaes et al. (2023).

References:

Novaes, R.L.M., V.C. Cláudio, D.E. Wilson, M. Weksler, and R. Moratelli. 2023. Taxonomic status of Myotis extremus (Chiroptera, Vespertilionidae) from Mesoamerica, with comments on the distribution and systematics of Myotis nigricans. Zoologischer Anzeiger 308(2024): 99-110. Read abstract.