develops from tarsal segment metatarsus tarsal segment 1 first segment of the tarsus FBbt:00004648 UBERON:6004648 The first of the tarsal segments of the adult leg. It is located between the tibia and the second tarsal segment and is longer than the other tarsal segments. It has 8 longitudinal rows of bristles around the circumference. fly_anatomy.ontology basitarsus 1st tarsal segment https://www.ento.csiro.au/biology/drosophila/melanogaster.html?basitarsi FBbt:00004647 first tarsal segment presumptive metatarsus