Archaeothyris is an extinct genus of ophiacodontid synapsid that lived during the Late Carboniferous and is known from Nova Scotia. Dated to 306 million years ago, Archaeothyris, along with a more poorly known synapsid called Echinerpeton, are the oldest undisputed synapsids known. [3]

始祖單弓獸屬（屬名：Archaeothyris）是種早期合弓動物，生存於約3億600萬年前的石炭紀晚期。 始祖單弓獸是目前已知最古老的合弓動物之一，另一屬是研究有限的 Echinerpeton [ 1 ] 。

Archaeothyris belonged to a group of early pelycosaurs which evolved early in the Pennsylvanian. It is thus seen as the precursor of all synapsids (which include mammals). Unlike the early sauropsids, Hylonomus and its kin, Archaeothyris was relatively large, measuring 50 centimetres (20 in) head to tail.

2012年3月4日 · As a living creature Archaeothyris looked like a modern day lizard, although at fifty centimetres long, it was one of the larger carnivores that were scurrying around the carboniferous forests. Its mouth had teeth that were small and sharp with two enlarged canines, suggesting an insectivorous diet at a time when the arthropods grew larger than ...

始祖单弓兽（属名：Archaeothyris）是种羊膜动物，生存于3亿2000万年前的石炭纪晚期。 始祖单弓兽是已知最古老的合弓动物之一。 它们发现于新斯克细亚，跟林蜥（Hylonomus）、油页岩蜥（Petrolacosaurus） 发现于同一地点。

始祖單弓獸（Archaeothyris）與Clepsydrops是已知最早的合弓類動物 [10] 。牠們屬於盤龍目，存活於石炭紀晚期（又稱賓夕法尼亞紀）。

Archaeothyris is an extinct genus of ophiacodontid synapsids that lived during the Late Carboniferous and is known from Nova Scotia. Dated to 306 million years ago, Archaeothyris, along with a more poorly known synapsid called Echinerpeton, are the oldest undisputed synapsids known.

Archaeothyris is a basal Synapsid, the clade the ultimately led to mammals and humans. The complete tree is here.

Archaeothyris, from slightly younger sediments near Florence, Nova Scotia, is the oldest known diagnosable ophiacodontid. This was a more advanced animal than the contemporary protorothyrid captorhinomorphs. Its jaws were strong, and …

蛇齿龙科，学名：Ophiacodontidas，是群合弓纲盘龙目动物，它们生存于晚 石炭纪 到 二叠纪。 始祖单弓兽（Archaeothyris）与Clepsydrops是最早的蛇齿龙类，出现于石炭纪晚期。 始祖单弓兽与它的近亲都属于蛇齿龙科。 有些蛇齿龙类是半水生的，少数是水生的，但有些是完全陆栖的，像是始祖单弓兽。 它们外表上与蜥蜴类似。 它们拥有延长的大型头骨，它们也有结实的肩带，可能用来提供肌肉连接，以支撑巨大的头部。 蛇齿龙科是合弓纲中最原始的一科，也许是所有盘 …