Walliserops (named after Prof. O. Walliser of the University of Göttingen) is a genus of spinose phacopid trilobite, of the family Acastidae, found in Lower to Middle Devonian age rocks from the Anti-Atlas Mountains of Morocco.

[3] Departures from bilateral symmetry are an unusual feature within Walliserops species, most clearly shown by the curved occipital spine of W. hammii taking a noticeable curl to one side.

Most of the exceptions to bilateral symmetry noted (and also the absence of spines on the first two thoracic segments) can be explained by adaptations allowing the trident to be held off the sea floor while walking.

With the amount of energy and nutrients expended in growing such a large adornment (probably multiple times as the trilobite shed its skin) its function was clearly important.

[2] Although the presence of horns strongly suggests sexual dimorphism,[4] lack of data on numerous fronts currently prevents firm conclusions from being drawn.