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Ophthalmology of Marsupials: Opossums, Koalas, Kangaroos, Bandicoots, and Relatives

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Wild and Exotic Animal Ophthalmology

Abstract

Marsupials are members of the mammalian infraclass “Marsupialia” and are characterized by the presence of a marsupium (or “pouch”) on the dam’s abdomen, in which their undeveloped young resides after birth. All extant marsupial species are native to the Americas and Australasia, and this group is highly diversified to fill biologic niches within their habitats. Seven marsupial orders are extant, with three being represented in the Americas, and the North American opossum (Didelphis virginiana) being the only species present in its title continent. The marsupial group is diverse enough to include domestic cat-sized obligate carnivores such as the tree-dwelling tiger quoll (Dasyurus maculatus), while also including the herbivorous tripedal red kangaroo (Macropus rufus) whose males can weigh over 90 kg. An example of the anatomic diversity observed in marsupials is such that holangiotic, paurangiotic, and avascular patterns are represented in the retinae of this infraclass (Wislocki 1940; Buttery et al. 1990; Rodger et al. 2001). To add to their uniqueness, some Australian marsupials may be the only non-primate mammals to possess trichromatic vision (Arrese et al. 2002, 2005).

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Reynolds, B.D., Caruso, K.A., Whittaker, C.J., Smith, J. (2022). Ophthalmology of Marsupials: Opossums, Koalas, Kangaroos, Bandicoots, and Relatives. In: Montiani-Ferreira, F., Moore, B.A., Ben-Shlomo, G. (eds) Wild and Exotic Animal Ophthalmology. Springer, Cham. https://doi.org/10.1007/978-3-030-81273-7_3

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