Figure 6
Larval diversity of the sea urchins in the genus Heliocidaris. (a) Pluteus of H. tuberculata. (b) Non-feeding, direct-developing larva of H. erythrogramma. These two specis diverged about 4 mya (Zigler et al, 2003). The abbreviated ciliary band is visible as a clear band on the lower part of the larva. Other pluteus features, arms and gut, are absent. (c) Hybrid larva from the H. erythrogramma x H. tuberculata cross. This is a dorsal view of a 2-day-old larva. Note the lobes that bear the ciliary band. Larval arms, mouth and gut will for by about four days of development. After Raff et al (1999).
