• (n.) Similarly in arrangement of parts; -- the opposite of heterotaxy.
Ho`mo·tax'is noun [ New Latin , from Greek ... the same + ... arrangement.] (Biol.) Similarly in arrangement of parts; -- the opposite of heterotaxy . 
homotaxis 1. A similarity of composition, arrangement, or fossil content among rock strata of different ages or locations. 2. Similarly in arrangement of parts; the opposite of heterotaxy.
a similarity of arrangement, as of geologic strata or fossil assemblages that have the same relative position but are not necessarily contemporaneous.