Pterothorax Orientation LateralⅤview Base of removed structure tes(stippling Ba Wp2 Sa Ba WP3 Sa PlS3 Indicates conjunctiva Pl Sutures P2- Fm3 Invaginations Sp2 E Articulation point Eps2 EpI 3 ASp3 Ppct Cx3 Tn CX2 Tr2Fm2 53 Tn AbsI Tr3