An apomorphy occurs when a taxon is selected to have a particular trait. Example: within the class reptilia, the suborder serpentes (snakes) has an apomorphy because its members have no legs. Plesiomorphy -- an evolutionary trait or character state that is homologous within a particular taxon but is not unique to members of that group and ...

Aug 7, 2024 · Ecydosozoans have the cuticle, but it is not shared by spiralia, so while the cuticle is an apomorphy of ecdysozoans, it is not an apomorphy of protostomes. evolution Share

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Jun 10, 2016 · The apomorphy that defines the tetrapods is "paired limbs". You have Amphibia to the left and Amniota to the right, whose apomorphy is " egg with extraembrionic membranes". Inside them, you have Reptilia, whose apomorphies are "skull with upper and lower fenestra and beta-keratin in epidermis". Turtles came from an ancestor with these ...

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