FIGURE 7. Spionid adult morphology. Chaetae. A 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 7. Spionid adult morphology. Chaetae. A, Prionospio sp., neuropodium of a middle segment, left fronto-lateral view, capillaries alternating with hooks, and single inferior sabre chaeta. B, Spiophanes sp., neuropodial hooks, small subterminal hood below main fang and a series of small upper teeth above main fang. C, Pygospio elegans, spoon-like hooks in neuropodium of segment 8. D, Pygospio elegans, bidentate hooks in neuropodium of segment 14. E, Dipolydora armata, posterior segment, awl-like spines in notopodium and hooded hooks in neuropodium. F, Streblospio benedicti, multidentate hooks with small upper teeth arranged in two vertical rows above main fang. ca—capillaries alternating hooded hooks; fa— main fang of hook; hh—hooded hook; ho—subdistal hood below main fang of hook; sa—inferior sabre chaeta; up—upper teeth above main fang of hook. Scales: A—20 µm. B, F—2 µm. C, D—5 µm. E—10 µm.