Echinocardium pennatifidum is a species of sea urchin in the family Loveniidae, chiefly found in the northeast Atlantic region.

The frontal ambulacrum is flush with the front of the heart-shaped test.

"[6] This species is critically distinguished from Echinocardium flavescens by its short labrum and the absence of larger spines in the interambulacral areas of the upper side of the test.

[7] Found in the waters off Great Britain, Ireland, the North Sea and associated islands.

[8] Echinocardium pennatifidum buries itself in coarse sand or fine shell gravel in the sublittoral, from low on shore to depths of 150 m (490 ft).