![]() ![]() ![]() ![]() In this study, we present first data concerning the morphological observations of the orbital region, eye tunics, upper and lower eyelids, superficial gland of the third eyelid with the third eyelid, and lacrimal gland in captive adult male Asiatic black bear. In the case of wild Canidae, a large color variation was also observed of this tapetum lucidum, not only between species, but also within the same species (green or yellow with a green border in the crab-eating fox, yellow with a green border in the maned wolf, or milky in the South African painted dog) and, for example, on the kinkajou Cercoleptes caudivolvulus (Procyonidae), the tapetum lucidum is a yellowish-green color, while on the ringtailed coati Nasua rufa (Procyonidae) it is bright green with yellowish patches. Murphy et al., 2012, reported that in the domestic dogs, the tapetal coloration, as well as the degree of pigmentation present in the non-tapetal region of the fundus, is correlated with coat color (e.g., dogs with brown and red coat colors had a more orange-tinted tapetal color while dogs with white or gray coats more often had a green-colored tapetal region) but also the tapetal size was in some cases correlated with breed with the smaller breeds often having proportionally smaller areas of the fundus occupied by tapetum. The different degree of coloration of tapetum lucidum is due to the optical phenomenon of thin-film interference rather than the presence of specific pigments (that is, tapetal coloration is structural rather than pigmentary). ![]()
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