Synapsid - Information from Answers.com
Synapsids were originally defined at the turn of the 20th century, as one of the
four main subclasses of reptiles, ...
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Therapsida: Definition from Answers.com
(paleontology) An order of mammallike reptiles of the subclass Synapsida which
... An order of Reptilia, subclass Synapsida, often called advanced mammallike ...
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Diapsid - Information from Answers.com
The other three subclasses were Synapsida (one opening low on the skull, for
the "mammal-like reptiles"), Anapsida (no skull opening, including turtles and
their ...
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Amniote - Information from Answers.com
The oldest known fossil synapsid is Protoclepsydrops from about 320 million ....
Subclass Neornithes (all modern birds, several extinct subclasses recognised) ...
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Human taxonomy - Information from Answers.com
... four limbs for terrestrial locomotion]; Clade - Amniota [...and amniotic eggs ("
terrestrial" eggs)]; Subclass - Synapsida; Order - Therapsida; Clade -
Theriodontia ...
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Vertebrate paleontology - Information from Answers.com
Class Reptilia. Subclass Anapsida. Order Cotylosauria †; Order Chelonia.
Subclass Synapsida. Order Pelycosauria †; Order Therapsida †. Subclass
Euryapsida ...
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Reptile - Information from Answers.com
The synapsid/sauropsid division supplemented, but was never as popular during
... approach splitting the reptiles into four subclasses based on the number and ...
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Mammal - Information from Answers.com
The class is divided into two subclasses (not counting fossils): the Prototheria ...
The early synapsid mammalian ancestors, a group which included pelycosaurs ...
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Dimetrodon - Information from Answers.com
As a synapsid it was more closely related to mammals than to true reptiles such
as lizards .... Underclass Anapsida; Subclass Diapsida; Underclass Synapsida ...
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