IS 



Anterior Subcostal Basivenale oriented antero-distad; slenderly ovoid; convex; weakly 

 elevated dorsad. Proximal section indistinct from the distal section. Distal margin 

 discontinuous from the ScA bulge; separated by a shallow concavity. Apex broadly 

 rounded. - Subcosta Anterior moderately convex. Bulge very broad. 

 Radial Basivenale extremely broadly open; broadly convex but extremely narrow; 

 continuous with radial stem; angled antero-proximad. Proximal arch slenderly deltoid; 

 continuous with the anterior margin of BR; extensions absent; angled postero-proximad. 

 Posterior margin rounded. Anterior margin strongly elevated above the posterior margin 

 of the ScA bulge; very broad; straight; angled antero-proximad. Embayment broad but 

 extremely shallow; broadly deltoid. Distal arch absent, br absent, br projection narrow; 

 convex; fused to the postero-distal margin of BScA. 



Second Basal Plate (Figs.23, 17-19) 



MA-BMA Junction present. - MP-BMP Junction: MP broadly continuous with BMP along 

 all margins and surfaces. - Crimp Patterns absent. - BMP-CuA Brace absent. - BMP- 

 BCuA Brace present; very strong but slender; extends posteriad; distinct from BMP; much 

 more strongly convex then BMP. Posterior fused within a deep concavity on the antero- 

 proximal margin of BCuA. 



Medial Basivenalia massive; BMA and BMP incompletely fused. BMA extremely broad 

 and very long; scaphoid; lies anteriad of BMP. Postero-medial section gives rise to FM2. 

 Proximal medial and distal surfaces very strongly convex. Anterior margin broadly 

 concave. Proximal arch planate and straight; extremely long; extremely broad; oriented 

 antero-proximad. Apex terminates below BR proximal arch apex. Postero-proximal section 

 gives rise to FM1. Distal arch Dorsal view: weakly differentiated from the posterior 

 section of BMA but distinct; weakly extended distad. - Ventral view: strongly extended 

 distad and continuous with BMA remnant. BMP proximal and distal sections 

 undifferentiated; broadly fused to both IBP and BCu. Anterior section weakly rectangular; 

 convex; curves anteriad; incompletely fused to BMA, separated by a very deep groove; 

 discontinuous with the posterior section of BMP. Posterior section present; broadly deltoid: 

 flat; strongly depressed below BMA and BMP anterior section; weakly sclerotized; fused 

 to BMA. Distal section distinct from the BMP-BCuA brace; long; broad; rectangular: 

 strongly convex. 



Cubital Basivenalia narrowly fused. Posterior margin of BCu A fused with the anterior 

 margin of BCuP. Suture line present. BCuA deltoid; small; convex; oriented postero-distad; 

 strongly sclerotized; lies posteriad of BMP and anteriad of the CuA base. Anterior margin 

 with a moderately broad but shallow concavity. Posterior margin continuous with CuA. 

 BCuP very large; ovoid; convex; oriented postero-distad; moderately sclerotized. Distal 

 embayment absent. - Cubitus Anterior fused to BCuA. Junction marked by a distinct 

 suture. 



Basal are 



Head - HP lobe very small; continuous with neck. Apex broadly truncate. Dorsal surface 

 weakly elevated from neck; not polished. BScP lobe claviform; weakly projects dorsad. 



