At first this bat was thought to be a phyllostomid. And so it was presented. Two characteristics supported the opinion: the nose-leaf (not clear in the photo) and the lack of a loose tail extending beyond the uropatagium (membrane which connects the hind legs and totally or partially include the tail). Examined by other specialists the nose-leaf (a lance-shaped skin projection) was not such and the loose tail does not show since bats may fold it and this gives the impression that there is no loose tail.

Olga Vaccaro sent the photos to the Programa de Conservación de Murciélagos de Argentina (organziation for bat conservation) and Rubén Barquez and César Bracamonte gave their own opinion on the subject. To them this is an Eumops possibly bonariensis which belongs to the family Molossidae.

According to Rubén Barquez he cannot think of another species or genus in this area with this aspect. What seems strange to him is that it is flying during the day unless this is an effect of the photo. César Bracamonte agrees in that this is an
Eumops for the big ears and the robust body and adds that if it was flying during the day he may have certainly been driven away from its shelter, something very common...
Regarding the tail Rubén comments that "when manouvering the tail may fold back and is not visible in a photo." For César "it is folded that is why it is not seen.