Cleared and double stained specimen of Eustomias obscurus (USNM 206711, 199 mm SL) under polarized light. (a) Myoseptum of V26. ENTB and EPTB present. Tendons within red musculature (RMTs) that run parallel to HM. (b) Myoseptum of V43. See description in (a) and note honeycomb structure of myoseptum (traced in parts hypaxially for better visualization). (c) Myoseptum of V60. See description in (a). (d) Overview of RMTs and attachment site for red musculature (RMA) in different body regions. (e) Caudal tendons. Abbreviations: DAC, dorsal anterior cone; ENTB, epineural tendon bone; EPTB, epipleural tendon bone; LT, lateral tendon; LTu, lateral tendon of compound ural centrum; RMA, attachment site of red musculature; RMTs, tendons within red muscle bundles; VAC, ventral anterior cone. Scale bars if not otherwise noted: 1 mm