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Clydonitaceae : ウィキペディア英語版 | Clydonitaceae
The Clydonitaceae is a superfamily in the ammonoid cephalopod order Ceratitida characterized by generally costate and turberculate shells with smooth, grooved, or keeled venters and sutures that are commonly ceratitic or ammonitic but goniatic in a few offshoots. ==Taxonomy== The Clydonitaceae unites 14 families (Arkell et al. 1962) (12 in Kummel 1952) derived from two ancestral stocks within, the Arpaditidae and the Trachyceratidae, which are derived from the Ceratitaceae. The Trachycerataceae, Haug 1894, used by Kummel, 1952 and more recently by Tozer, was originally equivalent to the Clydonitaceae, Mojsisovics 1879, of the Treatise, Part L; Kummel perhaps because the Trachyceratidae is one of two ancestral families while the Clydonitidae comprise a derived group. Tozer separated the Trachycerataceae from the Clydonitaceae, rearranging both, leaving the Clydonitaceae with the original Clydonitidae, Clionititidae, and Metasibiritidae to which are added the Sandlingitidae and Thetiditidae. The emended Trachycerataceae includes the Trachyceratidae, Arpaditidae, Cyrtopleuritidae, Distichitidae, Heraclitidae, Noridiscitidae, and Tibetitidae.
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「Clydonitaceae」の詳細全文を読む
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