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''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. == Etymology == ''Bolbolenellus'' is the combination of Greek βολβός (bolbos, “plant with round swelling on underground stem”), and ''Olenellus'', the rather distantly related genus to which all of the species were previously assigned. This refers to the bulb-like swelling of the frontal lobe of the glabella. The names of the species have the following derivations. * ''B. altifrons'' from the Latin altus (“high”) and from Latin frons (“forehead”), to express the species has a bulbous frontal glabellar lobe. * ''B. brevispinus'' from brevis the Latin word for "short" and spinus the Latin word for "spine". * ''B. groenlandicus'' is named for Greenland, where the species occurs. * ''B. sphaerulosus'' from the Latin sphaerula (small ball). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bolbolenellus」の詳細全文を読む スポンサード リンク
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