isotome

isotome Zool.

(ˈaɪsəʊtəʊm)

[f. iso- + Gr. τοµή cutting, section.]

An imaginary line conceived to pass through corresponding (homologous) joints or parts in a series of different animals, indicating homology.

Hence isotomous (aɪˈsɒtəməs) a., of or pertaining to an isotome.

[see isomere].