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Mammal Ancestors

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Mammal Ancestors
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Vocabulary

cynodont

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

lactation

Production of milk for an offspring by mammary glands; occurs in all female mammals after giving birth or laying eggs.
nocturnal

nocturnal

Active at night.
pelycosaurs

pelycosaurs

Informal grouping composed of Late Paleozoic synapsid amniotes; started to develop some of the traits of mammals.
sauropsida

sauropsida

Type of early amniote that evolved during the Carboniferous Period; eventually gave rise to dinosaurs, reptiles, and birds.
synapsid

synapsid

Type of early amniote that evolved during the Carboniferous Period; eventually gave rise to mammals.
therapsid

therapsid

Type of extinct organism that lived during the Permian Period; eventually gave rise to mammals.
endothermy

endothermy

Internal regulation of body temperature through metabolic or other physical changes.

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