episkeletal

from The Century Dictionary.

• In anatomy, situated above the axial endoskeleton; epaxial, as those muscles collectively which are developed in the most superficial portion of the three parts into which the protovertebræ of a vertebrate are differentiated: opposed to hyposkeletal.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Anat.) Above or outside of the endoskeleton; epaxial.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective anatomy Above or outside the endoskeleton; epaxial.