daltrixe lujvo

t1 is posterior /is placed caudal relative to t2 of animal/species d1=g3

x1 is more posterior than x2. Posterior: Towards the anus/opposite the typical direction of locomotion. In most animals, it's behind. In humans, it's down.

In notes:

g1 is dorsally oriented/is placed dorsal relative to g2 of animal d1=g3