33 



margin concave. Suture line between FPC+BPC and FC+BC present. FPC+BPC small; 

 rectangular: much shorter than FC+BC; distinct. 



Anterior Subcostal Basivenale broadly deltoid; weakly convex; oriented distad. Proximal 

 section extended as a short, narrow rectangle; separated from the distal section by a 

 prominent suture; as large as the distal section. Distal section continuous with the ScA 

 bulge. Apex broadly rounded; oriented distad. - Subcosta Anterior weakly convex. Bulge 

 narrow. 



Radial Basivenale convex; open; slender; oriented antero-proximad; continuous with the 

 radial stem. Proximal arch moderately narrow; short; directed strongly postero-proximad. 

 Anterior section present. Posterior margin extended proximad. Postero-distal margin 

 rounded. Anterior margin elevated above BScA; narrow. Embayment of normal size; very 

 strongly deltoid; surrounding margins are straight. Distal arch extremely weak; oriented 

 posteriad. br moderately sclerotized; very small; discontinuous with BR. br projection 

 dove-tail shaped; apically broad; arises from the antero-proximal margin of BR; distinct 

 from BScA. 



Second Basal Plate (Fig.50) 



MA-BMA Junction absent. - MP-BMP Junction entire. MP continuous with BMP. - Crimp 

 Patterns absent. - BMP-CuA Brace moderately broad and convex; adjacent to, but distinct 

 from, the distal margin of 2BP. Anterior margin slightly reduced; appears to arise from 

 below MP; oriented postero-distad. Point of fusion discontinuous with MP. Posterior 

 margin continuous with CuA; curved postero-distad. - BMP-BCuA Brace absent. - False 

 BMP-BCuA Brace present as a very strongly convex tube; formed from the median section 

 of BMP. Posterior margin distant from CuA and BCuA. 



Medial Basivenalia very large. Anterior and posterior margins concave. Anterior margin 

 adjacent to BR. Posterior margin separated from BCuA by a sclerotized concave groove 

 and membrane. BMA broadly scaphoid; completely fused with but distinct from BMP. 

 Anterior margin concave. Median convex. Posterior margin reduced. Proximal arch 

 allantoid; planate; straight; enlarged antero-proximally. Distal arch distinct; oriented 

 antero-distad; very small. BMP extremely narrow and short; discontinuous with the BMP- 

 CuA brace; indistinct from the False BMP-BCuA brace; distinct from IBP and BCu. 

 Proximal section extremely small; weakly convex. Medial section distinct; tube-shaped; 

 separated from the proximal and distal sections by deep grooves. Distal section slender; 

 more weakly convex than the medial section. Antero-distal section separated from the 

 posterior section by a weak impression. Postero-distal section present; very weakly 

 depressed below the anterior section. Distal margin strongly elevated from the surrounding 

 membrane. 



Cubital Basivenalia fused. Postero-proximal margin of BCuA fused with the antero-distal 

 margin of BCuP. Suture line present. BCuA slightly smaller than BCuP; deltoid; convex; 

 oriented distad; strongly sclerotized. BCuP weakly ovoid and convex; oriented posteriad; 

 weakly sclerotized. Embayment shallow. - Cubitus Anterior adjacent to, but not fused with 

 BCuA. Junction formed as a deep groove. 



