Fig. 5

Morphological characters of the endocarp in vertical position. a Raw image data. b Morphological measurements. Contour (red line) endocarp boundary, convex hull polygon (green line), green area area between the endocarp and its convex hull, maximum depth of the grooves (C–D) (black line vertical to the polygonal edge), shortest distance from the centre to the endocarp boundary segment (O–A)-(red dashed line), longest distance from the centre to the endocarp boundary segment (O–B)-(blue dashed line), inscribed circle the largest circle inside the endocarp boundary (pink dashed circle), minimum bounding circle (black dashed circle)