FIGURE 1 in Spionidae (Annelida) from shallow waters around the British Islands: an identification guide for the NMBAQC Scheme with an overview of spionid morphology and biology

FIGURE 1. Spionid adult morphology. Head and anterior segments, all in dorsal view with palps missing. A, Microspio sp., prostomium narrow and rounded anteriorly. B, Spio cf. filicornis, prostomium wide anteriorly, with frontal median incision. C, Marenzelleria viridis, prostomium wide and rounded anteriorly. D, Polydora cornuta, prostomium bilobed anteriorly. E, Malacoceros sp., prostomium with fronto-lateral horns. F, Spiophanes sp., prostomium with fronto-lateral horns and characteristic crook-like spines in neuropodia of segment 1. an—occipital antenna; cr—crook-like spine; fh—fronto-lateral prostomial horn; lo—lateral ciliated organ. Scales: A, B, D–F—100 µm. C—200 µm