Fig. 4
Invagination of cephalic and trunk discs in larvae of Micrura sp. “dark.” a1-a2 are confocal projections of a specimen stained with phalloidin (white) and propidium iodide (orange) and sectioned transversely (from apical to vegetal); anterior lobe is up. a1. A 1.95 μm slab showing the cephalic discs (cd) and the gut (gt). a2. Same individual as on a1, a 1.95 μm slab showing the trunk discs (td) invaginating from the larval epidermis. b. A diagram (apical view) summarizing a1-a2 (apical organ omitted for clarity). c. A diagram of the same stage as on a-b, showing a frontal view (apical up). Horizontal lines show approximate levels of the sections in a1-a2. Scale bars 50 μm