Didelphoidea
Didelphoidea(infraclass Metatheria, order Marsupialia) A superfamily (or full order, Didelphimorphia) that comprises the opossums (family Didelphidae) and extinct relatives known since the Upper Cretaceous. Possibly they are the least modified of all therian mammals. They are arboreal (except Chironectes, an otter-like, semi-aquatic form), mainly nocturnal, insectivorous or omnivorous marsupials, in which the marsupium may be well developed or (more usually) absent. There are more than three pairs of incisors in both upper and lower jaws. The second and third digits of the hind feet are didactylous. Didelphoids are distributed throughout tropical and subtropical America. There are twelve genera, and about 66 species.
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Upper , up·per1 / ˈəpər/ • adj. 1. situated above another part: his upper arm the upper atmosphere. ∎ higher in position or status: the upper end of the soci… Maxilla , max·il·la / makˈsilə/ • n. (pl. max·il·lae / makˈsilē; -ˈsilˌī/ ) Anat. & Zool. the jaw or jawbone, specifically the upper jaw in most vertebrates. I… Mammutidae , Mammutidae (Mastodontidae; order Proboscidea, suborder Mammutoidea) An extinct, monospecific family (Mammut or Mastodon) of mastodons, comprising ele… Plethodontid Salamanders , Plethodontidae (lungless salamanders; class Amphibia, order Urodela) A family of amphibians in which the adults usually lack gills and lungs. They ar… labrum , labrum
1. In Echinozoa, a lip-like projection of the peristome.
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Didelphoidea