Fig. 7

Expression of BarH at consecutive developmental stages in embryos of the onychophoran E. rowelli. Anterior is left in a, d, g, h, i–I”’, j and up in b, c, e, f, k; asterisks indicate the stomodeum; developing limbs are numbered. a Stage II embryo in lateral view, dorsal is up. b Same embryo as in A in ventral view. c Detail of the third and fouth developing legs in ventral view. Arrowheads indicate the mesodermal expression. d Stage IV embryo in lateral view, dorsal is up. e Head of a stage IV embryo in ventral view. f Posterior end of a stage IV embryo in ventral view. Arrowheads point to the expression around the proctodeum. g Detail of the lateral germ band of a stage IV embryo. Arrowheads point to the spot-like expression in the ectoderm dorsal of the developing limbs. h Same detail as in G, superimposed light micrograph and DAPI image. Arrowheads point to the spot-like expression in the ectoderm dorsal of the developing limbs. i–I”’ Developing limbs of a stage IV embryo in lateral view, dorsal is up. Arrows and arrowheads point to the longitudinal and diffuse mesodermal expression within each limb bud, respectively. j Stage VI embryo in ventral view. Empty arrowheads indicate the developing jaws. k Head of a stage VI embryo in ventral view. Arrows indicate uncharacterized regions of the brain. Abbreviations: Abbreviations: an, antennal tract; at, developing antenna; cl, cephalic lobe; cx, brain cortex; de, dorsal extra-embryonic tissue; jw, developing jaw; po, proctodeum; sp; developing slime papilla; st, stomodeum; ve, ventral extra-embryonic tissue. Scale bars: a, b, d, j: 500 μm; c, g, h: 100 μm; e, f, k: 200 μm; i–I”’: 50 μm