The rearrangements (T2, TDRL2) of A. mediterranea with respect to F. serratissima are shown below. Note that TDRL2 acts in the direction of A. mediterranea (in the direction of F.serratissima one more TDRL would be needed).

Florometra serratissima, Phanogenia gracilis ⇒ Antedon mediterranea

Antedon mediterranea ⇒ Florometra serratissima, Phanogenia gracilis