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Fig. 4 | EvoDevo

Fig. 4

From: The trochoblasts in the pilidium larva break an ancient spiralian constraint to enable continuous larval growth and maximally indirect development

Fig. 4

Fate of the second-quartet micromeres (2q) in the pilidium. The four middle panels show labeled domains (yellow) overlaying transmitted-light images (gray), for orientation. Peripheral panels show corresponding labeled domains alone, for clarity. Apical organ is up on all panels. Top row (A, D) shows left-side view (anterior lobe to the left); bottom row (B, C) shows right-side view (anterior lobe to the right). A Contribution of the 2a cell: inner ciliary band of left lappet, hyposphere tile cells of left side, left ciliary ridge (arrowhead). B Contribution of the 2b cell: tile cells of esophageal roof and floor of anterior lobe, primary ciliary band of anterior lobe and both lappets. C Contribution of the 2c cell: inner ciliary band of right lappet, hyposphere tile cells of right side, right ciliary ridge (arrowhead). D Contribution of the 2d cell: primary ciliary band and floor of posterior lobe, nerves (open arrowheads). Scale bar 50 μm

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