develops from
axillary sclerite
1st axillary sclerite
FBbt:00004738
pterale I
fly_anatomy.ontology
Sclerite of the wing hinge that articulates with the notal wing processes and the 2nd axillary sclerite. Its anterior end is immediately posterior to the humeral sclerite (FBbt:00004734).
presumptive 1st axillary sclerite