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Figure 4 | EvoDevo

Figure 4

From: Expression of the Lhx genes apterous and lim1 in an errant polychaete: implications for bilaterian appendage evolution, neural development, and muscle diversification

Figure 4

Expression of Nar - lim1 during juvenile development. (A), (D), (E), (G), (H), (I), (P), (Q), (U), (V), (Z-B’) Ventral views, anterior at top. (B), (C) Ventrolateral views, anterior at left. (F), (J-M), (R-T), (W-Y) Dorsal views, anterior at top. (N), (O) Anterolateral parapodial views, distal at right. (A), (D-F), (M) An asterisk marks the foregut. (C), (E), (I), (O), (Q) Hoechst fluorescence of the preceding specimen. (J-M), (R-T), (W-Y) Contiguous cephalic focal planes (dorsal to ventral). (M), (T), (Y), (Z) White dashes outline visible neuropil and cephalic nerves. Expression domains are indicated by: arrowheads presumed posterior growth zone, boxes presumed peripheral neurons, brackets brain, double arrowheads pharynx, ellipses parapodia, parallel red lines nascent segmental mesoderm. (A-C) Hatchlings. (A) The inset image shows a deeper pharyngeal focal plane. (D-G) Mid 3-chaetiger stage. (D-F) Anterior end. (D) Cephalic appendages are outlined. (F) Mid focal plane of the brain. (G) Posterior end, with pygidium outlined. (H-O) Late 4-chaetiger stage. (N), (O) Third parapodium. (O) False-colored expression and schematic bristles. (P-U) 7-chaetiger stage. (V) 7-chaetiger juvenile (inset image) and 9-chaetiger juvenile (main image) posterior end. The boxed region is from a shallower focal plane. (W-Z) 13-chaetiger stage. (A’), (B’) 20-chaetiger stage. Contiguous focal planes of VNC ganglia in a mid-body segment ((A’) is at a median focal level, and (B’) is deeper). Numbered lines in (A’) indicate the root locations of segmental nerves 1 to 4 in the right hemisegment. ac anterior cirrus, ae anterior eye, ai acicula, an antenna, ann antennal nerve, apn axial palp nerve, dc dorsal cirrus, ne neuropodium, nec neuropodial chaetal lobe, nel neuropodial ligule, no notopodium, p3-5 third to fifth parapodia, pa palp, pe posterior eye, sgn stomatogastric nerve, vc ventral cirrus, vbv ventral blood vessel, vm ventral longitudinal muscle, vnc ventral nerve cords, vnl ventral notopodial ligule.

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