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Olenellus

Olenellus is an extinct genus of redlichiid trilobites, with species of average size. It lived during the Botomian and Toyonian stages of the Lower Cambrian (Olenellus-zone), 522 to 510 million years ago, in what is currently North America, part of the palaeocontinent Laurentia.

Etymology
Olenellus means small Olenus, after a genus belonging to the Ptychopariida, to which the type species O. thompsoni was originally assigned. The name Olenus refers to a mythological figure who was turned to stone by the gods. The names of the species have the following derivations. • agellus comes from the Latin word for field or hamlet. • chiefensis refers to the Chief Range, which includes the Ruin Wash section, that holds the last of the Olenellina. • fowleri was named in honor of Ed Fowler, whose quarrying skills exposed the type locality of this species. • getzi is called after Noah L. Getz, on whose Lancaster estate several Olenellus species were first collected. • nevadensis refers to the state of Nevada, where this species is found. • parvofrontatus means ‘small front’ from the Latin words parvus and frontatus, indicating the short distance between the anterior border and the glabella in this species. • roddyi was named in honor of Dr. H. Justin Roddy (1856-1943), an internationally known naturalist, curator and professor of geology. • romensis refers to the Rome Formation. • terminatus is from the Latin terminus, meaning final, indicating the demise of the Olenellus lineage. == Taxonomy ==
Taxonomy
Relationship within the Olenellidae Olenellus is the only genus currently recognised in the subfamily Olenellinae. The sister group called the Mesonacinae consists of the genera Mesonacis and Mesolenellus. or a subgenus being part of Olenellus. Recent analysis shows that there is a group of species formerly assigned to Olenellus (Paedeumias) nested within Olenellus (O. clarki, O. nevadensis, O. parvofrontatus, O. roddyi and O. transitans). However, this group is more closely related to the majority of the remainder of Olenellus species than to O. agellus and O. romensis. This implies that either two new monophyletic subgenera need to be erected, or Olenellus (Paedeumias) and Olenellus (Olenellus) need to be dropped as subgenera, the latter being proposed by Lieberman. p. 8. fig 1-11, non pl. 7, fig 1, 2, 5 = Bristolia harringtoniO. bufrontis = Bolbolenellus sphaerulosusO. callavei = Callavonia callaveiO. cylindricus = Mesonacis cylindricusO. eagerensis = Mesonacis eagerensisO. euryparia = Bolbolenellus eurypariaO. forresti = Redlichia forrestiO. fremonti p. 220, pl. 5, fig. 7, non fig. 6 = Mesonacis vermontanusO. gigas = Andalusiana cornutaO. gilberti = Bristolia bristolensisO. groenlandicus = Bolbolenellus groenlandicusO. halli = Fremontella halliO. hamoculus = Mesonacis hamoculusO. hermani = Bolbolenellus hermaniO. hyperboreus = Mesolenellus hyperboreusO. insolens = Bristolia insolensO. intermedius = Fritzolenellus lapworthi or F. reticulatusO. kentensis = Bolbolenellus groenlandicusO. lapworthi = Fritzolenellus lapworthiO. laxocules = Elliptocephala laxoculesO. logani = Elliptocephala loganiO. mickwitzi = Schmidtiellus mickwitzi mickwitziO. mohavensis = Bristolia mohavensisO. multinodus = Nephrolenellus multinodus