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In trilobites, the head shield bearing the eyes, antennae, and mouth. More info?
Industry:Biology
Collection of nerve cells usually located at the anterior end of an animal, when present at all. The nerves coordinate information gathered by sense organs, locomotion, and most internal body activities.
Industry:Biology
End of the digestive tract, or gut, through which waste products of digestion are excreted, as distinct from the mouth.
Industry:Biology
A mammal that lays eggs rather than giving live birth. Though laying eggs is a primitive reptilian trait, monotremes share many morphological, physiological, and reproductive characteristics with other mammals, making them true mammals. Extant monotremes include the duck-billed platypus and echidna.
Industry:Biology
In eggshell, the shape, size, orientation, and distribution of components of the shell.
Industry:Biology
A mammal that gives live birth to young that have gestated for only a short period of time. The young usually crawl into a pouch (the marsupium) or protected area and attach to their mother’s teat to finish developing. Examples of marsupials include kangaroos, opossums, and koalas.
Industry:Biology
In birds and reptiles, the maintaining of a constant temperature during the development of the embryo. Birds incubate their eggs by sitting on them (also called brooding),while other animals, like crocodiles, bury their eggs in organic matter. If eggs are not incubated, the embryos within those eggs generally die. Some dinosaurs may have incubated their eggs by burial in sediment, in organic matter, or by brooding like birds.
Industry:Biology
A category in the classification of plants and animals between species and family; genera- pl.
Industry:Biology
The outer basic layer of tissue in those animals with true tissues. In vertebrates, for instance, the embryonic ectoderm differentiates into the skin and also the nervous system.
Industry:Biology
