FIGURE 20 in A morphometric diagnosis using continuous characters of Pinnunavis edkuensis, sp. nov. (Bacillariophyta: Bacillariophyceae), a brackish-marine species from Egypt

FIGURE 20. The relationship of valve breadth and length in Pinnunavis edkuensis, P. yarrensis, P. zalatii, the Port Elizabeth sample and protologue drawings of Navicula yarrensis. Solid lines are ordinary least squares (OLS) regression lines. Shaded areas delimit the 95% confidence intervals (dark) of the regression line and 95% prediction belts (light; k = 1) of an estimated mean breadth for a given length (See Table 2 for prediction model parameters and Discussion). The prediction interval subsumes the confidence interval. The dashed rectangles denote the ranges of valve length and breadth reported for Navicula aegyptiaca var. aegyptiaca (lengths 110–65 µm) and var. elliptica (lengths 52–38 µm) (Zalat 2000). The crosses (+) mark the locations of specimens in protologue drawings of N. yarrensis from plate 46 of Schmidt's (1876) Atlas labelled with the plate figure number (1–5) and the specimen locality, e. g., +2 Yarra Yarra; 3 drawings from Grunow's Bilder-sammlung are labelled with as G1061.58 and G1061.59 (Yarra Yarra) and G1489.59 (South Yarra) (see Fig. 14). The x-axis has been "reversed" relative to conventional plots to emphasize the changes in breadth over of the life cycle of the diatom, that is, with decreasing size.