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12.30: Mammal Ancestors

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
cynodont Therapsids that gave rise to modern mammals and their extinct close relatives; one of the most diverse groups of therapsids; named after their dog-like teeth.
lactation Production of milk for an offspring by mammary glands; occurs in all female mammals after giving birth or laying eggs.
nocturnal Active at night.
pelycosaurs Informal grouping composed of Late Paleozoic synapsid amniotes; started to develop some of the traits of mammals.
sauropsida Type of early amniote that evolved during the Carboniferous Period; eventually gave rise to dinosaurs, reptiles, and birds.
synapsid Type of early amniote that evolved during the Carboniferous Period; eventually gave rise to mammals.
therapsid Type of extinct organism that lived during the Permian Period; eventually gave rise to mammals.
endothermy Internal regulation of body temperature through metabolic or other physical changes.

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Date Created:
Feb 24, 2012
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Aug 28, 2016
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SCI.BIO.845.1.L.1