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Aplococeratidae : ウィキペディア英語版 | Aplococeratidae
Aplococeratidae is a family of ceratitids from the Middle Triassic with very simplified sutures and a tendency to lose their ornamentation. Shells are generally evolute, more or less compressed, with rounded venters. Ornamentation if present consists of ubilical ribs that disappear outwardly, toward the venter. The suture is ceratitic or goniatitic. Arkell ''et al.'' (1957), in the Treatise on Invertebrate Paleontology, Part L included the Aplococeraitdae in the Ceratitaceae, whereas E. T. Tozer in 1981 includes them in the Danubitaceae, established by Spath, also in 1951. Genera included in the Aplococeratidae are ''Aplococeras'' (type), ''Apleuroceras'', ''Epiceratites'', ''Laboceras'', ''Metadinarites'', ''Pseudaplococeras'', and ''Velebites''. ==References==
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