The term "mammal-like reptiles" is not considered a formal one by most experts; technically speaking, mammal-like reptiles were closer on the evolutionary branch to mammals than to reptiles as traditionally defined, as they possessed glandular skin that lacked scales. (Thus they can be better visualized as being "naked lizards", both furless and scaleless.) However, their overall character is more like a modern lizard than a modern mammal, and the distinguishing features are relatively fine ones of internal structure. It is currently unknown whether mammal-like reptiles possessed mammalian characteristics like body hair and mammary glands, as the only real evidence is provided by fossils that to date only suggest differences in skeletal structure.
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| - The term "mammal-like reptiles" is not considered a formal one by most experts; technically speaking, mammal-like reptiles were closer on the evolutionary branch to mammals than to reptiles as traditionally defined, as they possessed glandular skin that lacked scales. (Thus they can be better visualized as being "naked lizards", both furless and scaleless.) However, their overall character is more like a modern lizard than a modern mammal, and the distinguishing features are relatively fine ones of internal structure. It is currently unknown whether mammal-like reptiles possessed mammalian characteristics like body hair and mammary glands, as the only real evidence is provided by fossils that to date only suggest differences in skeletal structure.
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| abstract
| - The term "mammal-like reptiles" is not considered a formal one by most experts; technically speaking, mammal-like reptiles were closer on the evolutionary branch to mammals than to reptiles as traditionally defined, as they possessed glandular skin that lacked scales. (Thus they can be better visualized as being "naked lizards", both furless and scaleless.) However, their overall character is more like a modern lizard than a modern mammal, and the distinguishing features are relatively fine ones of internal structure. It is currently unknown whether mammal-like reptiles possessed mammalian characteristics like body hair and mammary glands, as the only real evidence is provided by fossils that to date only suggest differences in skeletal structure.
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