Heliophyllum is an extinct genus of corals that existed predominantly in the Devonian. Heliophyllum is of the order Rugosa and can be referred to as horn corals.Heliophyllum at Fossilworks.org They were mostly solitary animals, although some were colonial. The genus had a wide distribution. Fossils of H. halli have been found in the fossil rich Floresta Formation of the Altiplano Cundiboyacense, Colombia.Giroud López, 2014, p.39 This genus used its nematocysts to stun prey.
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