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Manatees
Trichechidae (manatees; superorder Paenungulata, order Sirenia) A family of aquatic paenungulates in which the upper lip is deeply cleft and each side is capable of independent movement and is used for cropping vegetation. There are no incisors or canines, but the gums form horny pads. There are up... Read more |
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narwhal
narwhal , a small arctic whale , Monodon monoceros. The males of this species, and an occasional female, bear a single, tightly spiraled tusk that measures up to 9 ft (2.7 m) in length. This tusk is an overgrown upper central incisor tooth, generally the one on the left. Very rarely do both... Read more |
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rodent
rodent member of the mammalian order Rodentia, characterized by front teeth adapted for gnawing and cheek teeth adapted for chewing. The Rodentia is by far the largest mammalian order; nearly half of all mammal species are rodents. They are worldwide in distribution and are found in almost every... Read more |
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teeth
teeth hard, calcified structures embedded in the bone of the jaws of vertebrates that perform the primary function of mastication. Humans and most other mammals have a temporary set of teeth, the deciduous, or milk, teeth; in humans, they usually erupt between the 6th and 24th months. These number... Read more |
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Wombats
wombat shy marsupial of Australia and Tasmania, related to the koala. The wombat is a thick-set animal with a large head, short legs (giving it a shuffling gait), and a very short tail. It is about 3 ft (91.5 cm) long. Its snout is either naked, as in the species Vombatus ursinus, or furred, as... Read more |
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Shrews
Soricidae (shrews; suborder Lipotyphla, superfamily Soricoidea) A family of small mammals that have short, dense fur, small eyes, ears which are usually visible externally, and long, mobile muzzles equipped with many sensory receptors. The upper molar teeth have a characteristic W-shaped pattern,... Read more |
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Maxilla
maxilla (pl. maxillae) 1. One of a pair of mouthparts in insects, crustaceans, centipedes, and millipedes. They lie behind the mandibles and their lateral movements assist in feeding. Crustaceans have two pairs of maxillae but in insects the second pair are fused together forming the labium. 2. One... Read more |
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infundibulum
infundibulum 1. In Ctenophora, a part of the gastrovascular cavity from which the radial canals originate. 2. In vertebrate embryos, an outpushing from the floor of the brain which, together with the hypophysis, develops into the pituitary body. 3. In Equidae, a lingual concavity, often called the... Read more |
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Malacostracans
Malacostraca (phylum Arthropoda, subphylum Crustacea) Class which contains nearly 75% of known crustaceans, including the larger forms, e.g. shrimps, crabs, and lobsters. The typical malacostracan trunk comprises 14 segments and a telson. The thorax is composed of eight segments, and the remaining... Read more |
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dentition
dentition kind, number, and arrangement of the teeth of humans and other animals. During the course of evolution, teeth were derived from bony body scales similar to the placoid scales on the skin of modern sharks. Tooth structures such as those found in humans are restricted to certain... Read more |
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