Figure 5. A in Hybridization in the evolution of animal form and life-cycle

Figure 5. A, nauplius of Penaeus sp. (recent Crustacea: Penaeidae). B, C, Martinssonia elongata (upper Cambrian): B, paranauplius II (left first appendage omitted); C, oldest known stage. Scale bar = ∼0.1 mm (A after Gurney, 1942; B, C adapted from Müller & Walossek, 1986b.)