FIG. 10. — Biometric data on Thylechinus (T.) sinaiensis n. sp. showing the relation between: test diameter and test height (H); test diameter and both of width of ambulacrum (Wa, filled quadrangles, solid line) and width of interambulacrum (Wi, empty quadrangles, dashed line); test diameter and each of number ambulacral tubercles per row (Na, filled quadrangles, solid line) and number of interambulacral tubercles per row (Ni, empty quadrangles, dashed line); test diameter and each of diameter of peristome (Dp, filled quadrangles, solid line) and length of apical system (Ls, empty quadrangles, dashed line).

Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 593, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/5378120