Bolbolenellus

Bolbolenellus ; Temporal range: Toyonian (Upper Olenellus-zone)
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Suborder:	Olenellina
Superfamily:	Olenelloidea
Family:	Biceratopsidae
Subfamily:	Biceratopsinae
Genus:	Bolbolenellus; Palmer & Repina, 1993
Species
	B. euryparia (Palmer, 1979) (Type), synonyms Olenellus euryparia, O. fremonti pro parte; B. altifrons (Fritz, 1972) , synonym Olenellus altifrons; B. brevispinus Palmer, 1998; B. groenlandicus (Poulsen, 1927), synonyms Olenellus groenlandicus, O. kentensis, Bristolia groenlandicus, Bristolia kentensis; B. hermani (Kindle & Tasch, 1948), synonyms Olenellus hermani, Esmeraldina hermani; B. sphaerulosus (Fritz, 1991), synonyms Olenellus sphaerulosus, O. bufrontis;

Bolbolenellus is an extinct genus of trilobites, fossil marine arthropods, with five species attributed to it currently. It can be easily distinguished from all other trilobites by the combination of the absence of dorsal sutures in the head shield like all Olenellina (which in all other trilobite suborders assist in moulding by splitting open), and a distinctly bulbous frontal lobe (L4) of the raised axial area in the head (or cephalon) called glabella. The species lived at the end of the Lower Cambrian.