...H. Van Twyver; T. Allison The echidna, an egg-laying mammal with alow (31–33 °C) body temperature, does not show paradoxical sleep (PS). The purpose of this study was to determine whether PS can occur at low body temperatures in a placental mammal. The nine-banded armadillo is a species reputed...

.... We also examined the middle ear of an armadillo, a mammal that has a very basal position within the eutherian phylogenetic tree. A small vesicle with ciliated cells was found, but did not label with a hair-cell specific marker, antibodies to myosin VIIa, and thus is not likely to represent a true PTO...