costal process

costal process

[′käst·əl ¦präs·əs]
(anatomy)
An anterior or ventral projection on the lateral part of a cervical vertebra.
(embryology)
An embryonic rib primordium, the ventrolateral outgrowth of the caudal, denser half of a sclerotome.
References in periodicals archive ?
4] vein terminating above the apex and the male genitalia possessing a digitate costal process.
7-9) with uncus continuous from tegumen; tuba analis extending beyond uncus, connected with uncus process dorsally to form scaphium; subscaphium present; valvae asymmetrical, a costal process present only on one valva; phallus without coecum; ductus ejaculatorius arising dorsally; cornuti present.
Valvae asymmetrical, left valva spatulate, densely setose on inner surface, terminal part of ventral margin slightly extended, with a dentiform, short process; right valva triangular, 2/3 as long as left valva, densely setose on ventral half of inner surface, with a dentiform, short process apically, costa convex at basal 1/3; costal process stout, bent at basal 1/3, broadened to apex, terminal 2/3 round dorsally, straight ventrally, obtuse apically.
2006) as Fallceon Waltz & McCafferty, but can be distinguished from this genus by the shape of the costal process of the hind wing (hooked in most species of Fallceon, erect in Spiritiops), and by the length of the marginal intercalary veins (long in Spiritiops and short in Fallceon).
DISCUSSION: Ribs develop by endochondral ossification from tips of lateral mesenchymal condensations called costal process in the thoracic region.
cassiterota has a golden yellow color of the forewing, a fringe that is metallic colored at distal half, and male genitalia with a costal process of the valva.