FIGURES 31–36 in Novel Neidium Pfitzer species from western Canada based upon morphology and plastid DNA sequences

FIGURES 31–36. Neidium vandusenense sp. nov. SEM, external view. Fig. 31. Whole valve. Fig. 32. Central valve with multiple longitudinal canals and transapical central area. Proximal raphe branches evenly hooked. Fig. 33. Apex valve face and mantle showing concave mantle wall, longitudinal canals reducing to one at the apex. Fig. 34. Valve face showing developed ridge along one side of the raphe (arrow) and scattered surface depressions along the axial area. Areolae recessed with a finger-like cribra. Fig. 35. Apex with 3 evident copulae. Copulae open bands with 2 rows of pores. Lacina extends to band base (arrow). Fig. 36. Central region showing a weak elevation of the longitudinal canal. Scale bars = 20 μm: Fig. 31; 10 μm: Figs 32, 33; 2 μm: Figs 34–36.