Seymouriamorpha were a small but widespread group of reptiliomorphs. Many seymouriamorphs were terrestrial or semi-aquatic. However, small aquatic larvae bearing external gills were found, making them unquestionably amphibians. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to crocodile-sized 150 centimeter long animals. They were reptile-like. Because seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes, or the relatives of the amniotes's ancestor. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, a group that includes the best known genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.
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| - Seymouriamorpha were a small but widespread group of reptiliomorphs. Many seymouriamorphs were terrestrial or semi-aquatic. However, small aquatic larvae bearing external gills were found, making them unquestionably amphibians. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to crocodile-sized 150 centimeter long animals. They were reptile-like. Because seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes, or the relatives of the amniotes's ancestor. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, a group that includes the best known genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.
- Many seymouriamorphs were terrestrial or semi-aquatic. However, aquatic larvae bearing external gills and grooves from the lateral line system has been found. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to small crocodile-sized 150 centimeter long animals. They were reptile-like. If seymouriamorphs are reptiliomorphs, they were relatives of amniotes. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, the latter group that includes the best known and type genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.
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| - (Watson, 1917)
- Seymouriamorpha
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| - *Discosauriscidae
*Kotlassidae
*Seymouriidae
*Waggoneriidae
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| - Seymouria from the Early Permian of North America.
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| - Seymouriamorpha were a small but widespread group of reptiliomorphs. Many seymouriamorphs were terrestrial or semi-aquatic. However, small aquatic larvae bearing external gills were found, making them unquestionably amphibians. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to crocodile-sized 150 centimeter long animals. They were reptile-like. Because seymouriamorphs are reptiliomorphs, they were the distant relatives of amniotes, or the relatives of the amniotes's ancestor. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, a group that includes the best known genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.
- Many seymouriamorphs were terrestrial or semi-aquatic. However, aquatic larvae bearing external gills and grooves from the lateral line system has been found. The adults were terrestrial. They ranged from lizard-sized creatures (30 centimeters) to small crocodile-sized 150 centimeter long animals. They were reptile-like. If seymouriamorphs are reptiliomorphs, they were relatives of amniotes. Seymouriamorphs form into three main groups, Kotlassiidae, Discosauriscidae, and Seymouriidae, the latter group that includes the best known and type genus, Seymouria. The last seymouriamorph became extinct by the end of Permian.
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