claim: Blank Space is the name of a list.
evidence: Michelinoceras is the oldest known genus of the Michelinocerida , more commonly known as the Orthocerida , characterized by long , slender , nearly cylindrical orthocones with a circular cross section , long camerae , very long body chambers , and a central or near central tubular siphuncle free of organic deposits .. Orthocerida. Orthocerida. Septal necks are straight ; connecting rings cylindrical and thin .. Cameral deposits are well developed .. A radula has been found in one species , with seven teeth per row .. It had ten arms , two of which formed longer tentacles .