Classification of animals with legs usually comes in handy in the 'arthropod' group(invertebrates).
Arthropods
Myriapods- 20 or more legs
Arachnids- 8 legs
Insects- 6 legs
Crustaceans- 10-14 legs
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Animals with legs can be classified into different groups based on the number of legs they have and their characteristics. For example, insects have six legs and belong to the class Insecta, while mammals typically have four legs and belong to the class Mammalia. Other groups of animals with legs include reptiles (e.g. lizards, snakes) and amphibians (e.g. frogs, salamanders).
The finest level of classification for animals is species.
Phylogenetic classification groups animals based on their evolutionary relationships and genetic similarities. This form of classification organizes animals into groups based on their shared ancestry and common descent.
Single circulation and double circulation
Turtles, newts.
The most common classification scheme for all animals is the Linnaean system, which categorizes organisms into hierarchical groups based on shared characteristics. This system includes categories such as kingdom, phylum, class, order, family, genus, and species.