The Puerto Rican long-nosed bat (Monophyllus plethodon frater) is known only from a skull fragment excavated in the large Cathedral Cave near Morovis, Puerto Rico, by Dr. H. E. Anthony prior to 1917. This species was never observed or documented live.
The Puerto Rican long-snouted bat (Monophyllus plethodon frater) is known from a single fossilized skull found in the Cathedral Cave near Morovis, Puerto Rico, by Dr. H. E. Anthony prior to 1917. This species remains unknown due to its absence of live observations.