Olenelloides

Olenelloides is an extinct genus of small sized (about 1 centimetre or 0.39 inches long) fossil trilobites, a well-known type of marine arthropod. It lived during the later part of the Botomian stage, which lasted from approximately 524 to 518.5 million years ago. This faunal stage was part of the Cambrian Period. The most conspicuous feature is the hexagonal head shield that carries 6 ray-like spines. O. armatus is the only known species in this genus (i.e. the genus is monotypic).