The new genus can be associated with Urodidae by the forewing [Rs.sub.4] vein terminating above the apex and the male genitalia possessing a digitate costal process
. It is distinguished from all other urodid genera in having asymmetric valvae in the male genitalia and 4 signa in the female genitalia.
The caudal end of the costal process
of the transverse process of the 6th cervical vertebra was pointed.
DISCUSSION: Ribs develop by endochondral ossification from tips of lateral mesenchymal condensations called costal process
in the thoracic region.
Chrysonasma caliginosa has a light orange to grayish orange ground color of the forewing, a fringe that is shining orange gray at distal half, and the male genitalia with valva lacking a costal process
, whereas C.
In the 5thweek, the sclerotomic cells of the somites lose their adherence and migrate to the vertebral centrum, neural processes and costal processes
. Each thoracic neural process gives rise to a cartilaginous pedicle, transverse process and lamina.