<p><strong>Fig. 3.90.</strong> (<strong>D</strong>) Oral surface of a cushion star (<em>Culcita novaeguineae</em>) with ambulacral grooves visible</p>

Fig. 3.90. (D) Oral surface of a cushion star (Culcita novaeguineae) with ambulacral grooves visible

Image courtesy of Lyle Vail, Gaia Guide