Figure 10. Ophiura robusta postlarval development. A, B, 0.45 in Who's who among baby brittle stars (Echinodermata: Ophiuroidea): postmetamorphic development of some North Atlantic forms

Figure 10. Ophiura robusta postlarval development. A, B, 0.45 mm dd postlarvae; A, dorsal, note the structure of the plates; B, ventral, note the shape of the first ventral arm plate (VAP1); C, D, 0.55 mm dd postlarva; C, dorsal; D, ventral; E, 0.85 mm dd postlarva dorsal; F, G, 1 mm dd postlarvae; F, dorsal; G, ventral; H, I, 1.3 mm dd postlarvae; H, dorsal; I, ventral; J, K, 1.8 mm postlarvae; J, dorsal, note the heart-shaped first dorsal arm plate (DAP1); K, ventral; L, 2.9 mm dd juvenile dorsal, arm combs have formed and the DAP1 has its final heart-shape. Abbreviations: H, hydropore; k, k-plate; SIR, secondary inter-radial plate; others as in Figs 1–3, 5. Scale bars in millimetres.