FIGURE 6 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 6. Spionid adult morphology. General arrangement of chaetae in Spionidae and modified chaetae in segment 5 in Polydorini adults; notice absence of parapodial lamellae on segment 5 in B, E, F, and presence of low lamellae in both rami in C. A, Dipolydora cardalia, segment 4 neuropodium, left lateral view, anterior, posterior and inferior groups of capillaries. B, Boccardia sp., segment 5, left lateral view, brush-topped spines in anterior row and falcate spines in posterior row of notochaetae, and a tuft of short ventral capillaries. C, Pseudopolydora sp., segment 5, left lateral view, dorsal superior capillaries, enlarged capillaries with inflated limbation in anterior row and falcate spines in posterior row of notochaetae (both arranged in reflected J-shaped rows), and ventral capillaries. D, Polydora cornuta, companion chaetae in anterior row and falcate spines in posterior row of notochaetae, characteristic dishevelled, feathery tip in companion chaetae and small lateral tooth in falcate spines. E, Dipolydora cardalia, segment 5, left lateral view, dorsal superior capillaries, companion chaetae in anterior row and falcate spines in posterior row of notochaetae, and ventral capillaries. F, Dipolydora armata, segment 5, left lateral view, three dorsal superior capillaries, two falcate spines with large lateral tooth and cowling on convex side, and three ventral capillaries. an—anterior group of chaetae in podium; ds—dorsal superior capillaries in notopodium; fa—heavy falcate spines; in—inferior capillaries in neuropodium; ne—neuropodial postchaetal lamella; no—notopodial postchaetal lamella; po—posterior group of chaetae in podium; to—lateral tooth in heavy falcate spine; ve—ventral capillaries. Scales: A, D, F—10 µm. B—100 µm. C—50 µm. E—20 µm.