Figure 6

Possible endite homologs in the mouthparts of Glomeris. Schematic representations of the mouthparts of Glomeris (A-C). An insect mouthpart (maxilla of Schistocerca) is shown for comparison (D). (A) Glomeris maxilla. (B) Left and right maxilla of Glomeris already fused forming the gnathochilarium. (C) Glomeris mandible. The palp is proposed to be lost in Glomeris gnathalia ([7]; grey hatched line). The black hatched line indicates where the appendage inserts on the segment. Expression of dpp is shown in grey (hatched area in the maxilla: very weak expression). Please note that the figure shows all observed expression domains in a single drawing although really some domains appear at different time points (see text for a description of the temporal expression profile). None of the possible endite homologs in Glomeris mouthparts (lli, st, iml, and eml) expresses Gm-dpp in a fashion suggestive of a role in PD axis patterning. See text for details. Expression of dpp in Schistocerca is after [11]. Abbreviations: bs, base; ca, cardo; eml, external mandibular lobe; ga, galea; iml, internal mandibular lobe; lc, lacinia; le, lobus exterior; li, lobus interior; lli, lamella lingualis; lm, lobus medius; plp, palp; st, stipes.