Diagrams summarising the innervation pattern of foregut and midgut structures in Tardigrada and Onychophora.

<p>(<b>A</b>) Stomodeal complex innervating the mouth, the stylet and the pharynx (green) and the stomatogastric ganglion with its projections (magenta) in the tardigrade <i>Macrobiotus</i> cf. <i>harmsworthi.</i> (<b>B</b>) In the onychophoran <i>Euperipatoides rowelli</i>, the ectodermal pharynx is innervated by a loop-like, medullary pharyngeal nerve (blue), which is accompanied by neuronal somata. The endodermal midgut shows numerous neuronal cell bodies scattered in the gut wall (red). Abbreviations: at, antenna; br, brain; ga2, second trunk ganglion; jw, jaw; le1–le4, walking legs 1 to 4; mg, midgut; mo, mouth; nc, nerve cord; oe, oesophagus; ph, pharynx; sg, stomatogastric ganglion; sp, slime papilla.