FIGURES 19–25 in Cocconeis pinnata W. Gregory ex Greville (Bacillariophyta): Lectotypification and an emended description after examination of type material and South Pacific specimens

FIGURES 19–25: Cocconeis pinnata from Tahiti Island (SEM). External views of the SV. Fig. 19, 20, 21: complete valve. Fig. 22: detail of the margin, with pearls-globular corpuscles spread on the striae. Figs 23, 24: apex and detail of the apically/axially elongated areolae in mid-valve. Fig. 25: open SV valvocopula (arrows). SEM, scale bars: Fig. 20: 8 µm; Fig. 21: 6 µm; Fig. 19: 5 µm; Fig. 24: 3 µm; Figs 22, 23, 25: 1 µm.