Figure 10. Lateral organs. A-D in Systematics, evolution and phylogeny of Annelida - a morphological perspective

Figure 10. Lateral organs. A-D. Malacoceros fuliginosus, (Spionidae). A. 2 parapodia with lateral organ (boxed) between noto- (no) and neuropodium (ne). B. Enlargement of left parapodium, lateral organ visible as ciliary brush. C. Enlargement of B, note cilia arranged in distinct rows. D. Base of 2 collar receptors with single sensory cilium (ci) and circle of microvilli (mv). E-F. Eunice pennata (Eunicidae). Lateral organ (dorsal cirrus organ). E. 2 parapodia showing position of lateral organ (boxed). F. Enlargement of boxed area from E. G-J. Lateral organ like ciliary bands of unknown function between noto- and neuropodia in polychaetes. G-H. Eurythoe complanata (Amphinomidae). G. Anterior end, lateral view; arrows point to ciliary bands between noto- and neuropodia. H. enlargement of parapodium. I-J. Syllis sp. (Syllidae). I. Anterior end lateral view, parapodia with ciliary bands (arrows). J. Enlargement of parapodia with ciliary bands (arrow). - br = branchia, no = notopodium, ne = neuropodium, ci = cilium, mv = microvillus, dc = dorsal cirrus, vc = ventral cirrus, la = lateral antenna, pa = palp, ma = median antenna, tc = tentacular cirrus. SEM Micrographs; originals E, F M: Nesnidal, Osnabrück, G-J S; Raabe, Osnabrück