Protoceratidae An American offshoot from the main traguloid stem of Artiodactyla, ranging from the Oligocene to the Pliocene, that were deer-sized mammals with horn-like structures in the nasal region, above the orbits, and on the upper part of the brain case. The Pliocene Synthetoceras had two horn-pairs, the nasal pair being fused into a Y shape.
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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… Painter, Eleanor (1890–1947) , pair / pe(ə)r/ • n. a set of two things used together or regarded as a unit: a pair of gloves. ∎ an article or object consisting of two joined or cor… Labium , labium (pl. labia) 1. The lower lip in the mouthparts of an insect, which is used in feeding and is formed by the fusion of a pair of appendages (the… labrum , labrum 1. In Echinozoa, a lip-like projection of the peristome. 2. A broad piece of cuticle which forms the upper ‘lip’ in an insect. The labrum arti… optic nerve , optic nerve The second cranial nerve: a paired sensory nerve that runs from each eye to the brain. It is responsible for conveying visual stimuli rec… spectroscopic binary , spectroscopic binary See STAR PAIR.
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