
Fig. 10. Models of apical systems. A. Primordial (normal) symmetry. B. Lovén symmetry. C–G. Primordial (changed) symmetry. A, B adopted from Saucéde et al. (2003). Abbreviations: L, axis−Lovén's axis; vU, axis−von Ubisch axis; PK, periproct; I–V, growth zone; G1–G5, genital areas.
Published as part of Ceranka, Tomasz, 2007, Symmetry disorders of the test of the Miocene echinoid Echinocyamus from Poland, pp. 503-518 in Acta Palaeontologica Polonica 52 (3) on page 514, DOI: 10.5281/zenodo.13741506
Biodiversity, Taxonomy
Biodiversity, Taxonomy
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