Spicomellus is an extinct genus of early ankylosaurian dinosaur from the El Mers III Formation (Bathonian-Callovian) of Morocco.

The Spicomellus holotype specimen, NHMUK PV R37412, was discovered in layers of the El Mers III Formation near Boulahfa in Boulemane, Fès-Meknès region, Morocco.

[1] In 2021, Maidment et al. described Spicomellus afer as a new genus and species of ankylosaurian thyreophoran based on these fossil remains.

[1] An unnamed thyreophoran from the Bajocian-aged Bearreraig Sandstone Formation of the Isle of Skye, Scotland, could be older than Spicomellus, but it is unclear if these fragmentary remains belonged to a stegosaur or an ankylosaur.

[7] The discovery of Spicomellus also shows that the two major thyreophoran groups (Ankylosauria and Stegosauria) coexisted for over 20 million years, and implies that the putative extinction of the stegosaurs in the Early Cretaceous may have happened for reasons other than an increased diversity of anyklosaurs at that time.

[1] Studies by the describing authors of the sedimentology and stratigraphy of the locality suggested a shallow marine depositional environment with continental mixed clastic, evaporitic and carbonate sediments.