FIGURE 10.

Dissected myosepta of Eustomias simplex (USNM 372020, 223 mm SL) photographed under polarized light. (a) Dorsal part of myoseptum of V11 at 0,37L. ENTB present. (b) Myoseptum of V47 at 0,85L. ENTB/EPTB present. (c) Myoseptum of V49 at 0,87L. ENTB and EPTB shorten with tendinous attachment further dorsal/ventral on neural spine/haemal spine. (d) Myoseptum of V51 at 0,90L. Dorsal and ventral LTs run parallel to HM. (e) Myoseptum of V56 at 0,93L. DAC/VAC anteriorly elongated. Dorsal and ventral LTs run parallel to HM. Abbreviations: DAC, dorsal anterior cone; DPC, dorsal posterior cone; ENTB, epineural tendon bone; EPTB epipleural tendon bone; HM, horizontal midline; LT, lateral tendon; MT, myorhabdoid tendon; NS, neural spine; RMA, attachment site of red musculature; RMTs, tendons within red muscle bundles; VAC, ventral anterior cone; VPC, ventral posterior cone