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Fig. 1 | EvoDevo

Fig. 1

From: The role of HoxA11 and HoxA13 in the evolution of novel fin morphologies in a representative batoid (Leucoraja erinacea)

Fig. 1

Developmental staging scheme for the little skate, Leucoraja erinacea, outlining early pectoral and pelvic fin development (ac) and later pelvic fin development (dk). Early development shows the paired fin outgrowth from the midline of the body. Sex is indeterminate at these stages (ac). At stage 30, clasper morphogenesis begins in males, with visible curvature of the posterior bud (d), which is absent in females (e). Outgrowth of the crura begins in the anterior pelvic fins at stage 30 as well (d, e). As development continues the claspers form a separate lobe (f) and eventually forms a rolled structure by stage 33 (j). Likewise, the crura continue to elongate distally, forming a distinct morphology (fk). Asterisks indicate crura on both males and females. Black arrows indicate claspers (d, f)

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