. Bulletin of the Natural History Museum Zoology. Fig. 137 Yoldiella argentinensis (a), Y. extensa (e) & (separately) Yoldiella inconspicua inconspicua (i), Y. i. profundorum (p) & Y. i. africana (a). hbc. Fig. 139 Yoldiella bilanta (b), Y. hanna (h) & Y. capensis (c). Figs 136-147 Outline comparisons of species by overlay technique. Each outline is centred with reference to the junction of the centre of the mid-length axis with the centre of the mid-height axis. Outlines are drawn to a similar length. Each shell outline comprises the margin in right lateral view, hindgut loop and
. Bulletin of the Natural History Museum Zoology. Fig. 137 Yoldiella argentinensis (a), Y. extensa (e) & (separately) Yoldiella inconspicua inconspicua (i), Y. i. profundorum (p) & Y. i. africana (a). hbc. Fig. 139 Yoldiella bilanta (b), Y. hanna (h) & Y. capensis (c). Figs 136-147 Outline comparisons of species by overlay technique. Each outline is centred with reference to the junction of the centre of the mid-length axis with the centre of the mid-height axis. Outlines are drawn to a similar length. Each shell outline comprises the margin in right lateral view, hindgut loop and anterior and posterior adductor muscles. Anterior, posterior ventral and dorsal limits are indicated parallel to the relevant shell axis as too is the apex of the umbo. Each limit is identified by the first letters of the species name. The figures are in the order of the discussion on the evolution of form. (See text pp. 82-86).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Natural History Museum (London). Andover : Intercept
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