Retifacies abnormalis is an extinct arthropod that lived in the lower Cambrian (about 518 million years ago).

The three uniramous appendages had six segments (podomeres), each ending with a terminal claw, with the endopod of the fourth limb having a similar morphology.

The trunk was divided up into 10 segments (tergites), all of approximately equal length and width, each of which were associated with pairs of biramous appendages.

These limbs also bore exites, consisting of lamellae borne from the basal segment (basipod) of the appendage.

[4][2] Due to a lack of information about the gut morphology or contents, the reconstruction of the ecology of Retifacies is speculative.