E. Raymond Hall, The Subspecific Status of Two Central American Sloths
“ In brief, while we see the characters of ignavus as set forth by Goldman (op. cit.) , we find them to be of only an average sort and not pronounced. Further, a specimen (No. 139833) from Vijagual, San Carlos, Costa Rica, provides a morphological intergrade between griseus and ignavus. ”
E. Raymond Hall, The Subspecific Status of Two Central American Sloths
“ Accordingly, we arrange ignavus as a subspecies of griseus; the name of the animal from extreme eastern Panamá should stand as Bradypus griseus ignavus Goldman, 1913.Cyclopes didactylus mexicanus HollisterHollister (Proc. Biol. Soc. Washington, 127:210, October 31, 1914) named Cyclopes mexicanus, on the basis of light-golden upper parts and large, especially broad, auditory bullae, as specifically distinct from Cyclopes dorsalis Gray (= Cyclopes tridactylus dorsalis Gray) . ”
E. Raymond Hall, The Subspecific Status of Two Central American Sloths
“ Our comparisons and examination of the specimens used by Hollister and a few other specimens acquired since 1914 convince us that C. mexicanus is taxonomically valid and that Hollister, in general, correctly indicated its diagnostic characters. Nevertheless, there is considerable evidence that C. mexicanus is only subspecifically distinct from C. dorsalis. In the first place, an adult C. dorsalis, not seen by Hollister, from El Banco, Chiriquí, Panamá (No. 248343 USBS) , has more inflated, although narrower, auditory bullae than do specimens of C. mexicanus. ”
