Property information
x appendage_segment_number N if and only if (i) x is a appendage_segment, and (ii) x is appendage_segment number N in a series of appendage_segments repeated along an proximo-distal axis, with appendage_segment_number 1 being the proximalmost appendage_segment (in tetrapods this would be the stylopod, as we do not classify girdles as appendage segments).
comment
Examples: in dropsphila coxa=1, trochanter=2, femur=3, tibia=4, tarsal segments 1-5=5-9, pretarsus=10