Fig. 1

Overall morphology of glands, ducts, muscles and nerves in the legs and associated body regions of male Sinelobus sp., as revealed by SBF-SEM scans. a Whole animal; the box indicates the area scanned in b. b left-half of pereonites 3–4 with legs attached (see Additional file 1 for 3D movie). c pereopod 3 (thread-spinning; see Additional file 2 for 3D movie). d pereopod 4 (non-thread-spinning; see Additional file 3 for 3D movie). Abbreviations: bm1 and bm2, basis muscles 1 and 2; cm1 and cm2, carpal muscles 1 and 2; mm1 and mm2, merus muscle 1 and 2; p1-p6, pereopod 1–6; pm1 and pm2, propodal muscles 1 and 2; tg1(p1), tg1(p2), tg1(p3), thoracic gland 1 at pereonites 1–3; tg2(p2), tg2(p3), thoracic gland 2 at pereonites 2 and 3. Scale bars, 0.5 mm for a, 30 μm b-d