Embryonic, Larval, and Early Juvenile Development of the Tropical Sea Urchin, Salmacis sphaeroides (Echinodermata: Echinoidea)

Figure 2

Larval developmental stages of S. sphaeroides under compound microscopy. (a) Gastrula, (b) Prism, (c) 2-arm pluteus, (d) 4-arm pluteus, (e) 6-arm pluteus, (f) 8-arm pluteus, (g) Pre-competent larva with ciliated ring and growing rudiment, (h) Competent larva with complete rudiment growth, (i) Juvenile (1 d after metamorphosis).

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