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Lituitidae
The Lituitidae is a family of evolved tarphycerids characterized by a long orthoconic section that follows a coiled juvenile portion at the apex, along with a generally tubular siphuncle, which like that of the barrandeocerids is composed of thin connecting rings.
==Taxonomic position==
Flower and Kummel (1950)〔Flower & Kummel, 1950. A Classification of the Nautiloidia. Jour Paleontology, V.24, N.5, pp 604-616, Sept〕 included the Lituitidae in the Barranderocerida which are now included in the Tarphycerida as a number of derived families. Furnish and Glenister (1964)〔Furnish & Glenister, 1964, Nautiloidea -Tarphycerida. Treatise on Invertebrate Paleontology Part K〕 removed the Lituitidae to the Tarphycerida on the basis of observed similarities in the structure of the siphuncle. Other taxonomies, e.g. Dzik (1981)〔Dzik, 1981. Origin of the Cephalopoda. Acta Palaeont. Polonica 26, 2, 161-191〕 include the Lituitidae in the Orthocerida partly on the basis of the subcenral siphuncle and thin connecting rings, on the misconception that ''Rhynchorthoceras'' is ancestral.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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