Topic summary
Appendages
Extracted from the Wikipedia article Appendage.
In protostomes
Appendages may become uniramous, as in insects and centipedes, where each appendage comprises a single series of segments, or it may be biramous, as in many crustaceans, where each appendage branches into two sections. Triramous (branching into three) appendages are also possible. In the past this difference in leg development became the basis of arthropod classification, with Uniramia being a former group within Arthropoda.