Figure 20 in Systematic taxonomy of the Trilobatus sacculifer plexus and descendant Globigerinoidesella fistulosa (planktonic foraminifera)

Figure 20. Example of circularity and curvature values for Globigerinoidesella fistulosa specimens. More lobate values are those in blue, those less lobate are red. Specimens 1 and 2 are more elongate and possess the lowest circularity values, but have a low perimeter length compared to test area and thus also generate low curvature values. Conversely, specimens 3 and 4 have high curvature values due to the protuberances increasing the perimeter length, but also relatively high circularity values because of the large area compared to test diameter (see Material and methods). Scale bar = 200 Lm.