FIGURE 2 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 2. Spionid adult morphology. Head and anterior segments, all with palps missing. A, Aurospio dibranchiata, anterior end, dorsal view, rounded prostomium, short caruncle extending over segment 1, and two pairs of small branchiae on segments 3 and 4. B, Laonice sp., left fronto-lateral view, prostomium well separated from peristomium, anterior part of U-shaped nuchal organ, and branchiae from segment 2 free from notopodial lamellae. C, Malacoceros sp., anterior end, left lateral view, prostomium with fronto-lateral horns, and branchiae from segment 1 basally fused to notopodial lamellae. D, Laonice cirrata, left fronto-lateral view, prostomium fused to peristomium on fronto-lateral margin, and occipital antenna. E, Microspio sp., anterior end, dorsal view, prostomium bifurcate anteriorly and clearly divided into anterior, middle and posterior parts, branchiae from segment 2 free from notopodial lamellae. F, Microspio sp., anterior end, dorsal view, prostomium rounded anteriorly, branchiae from segment 2 basally fused to notopodial lamellae. an—occipital antenna; br—branchia; fh—frontolateral prostomial horn; lo—lateral ciliated organ; nu—nuchal organ; pa—palp scar; pe—peristomium; pr—prostomium. Scales: A, B—100 µm. C, D—200 µm. E, F—50 µm.