Micrasterine spatangoids with:
Lower Miocene to Recent; worldwide.
Mortensen (1951) distinguished Echinocardium from the other members he accepted in the Loveniidae, placing it in its own subfamily. This seems justified. The short, wide labral plate distinguishes it from all other genera, as does the fact that the subanal fasciole and episternal plates are entirely posterior and do not extend onto the oral surface.