کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8916273 1642035 2018 23 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The Arestoceratinae van Hoepen, 1942: A resurrected subfamily of late Albian brancoceratid ammonites, with description of a new genus
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
The Arestoceratinae van Hoepen, 1942: A resurrected subfamily of late Albian brancoceratid ammonites, with description of a new genus
چکیده انگلیسی
The subfamily Arestoceratinae van Hoepen (1942), long relegated to the synonymy of Mortoniceratinae (Wright, 1957, 1981, 1996), is resurrected for a phyletically-distinct group of strongly-compressed, generally bituberculate, late Albian brancoceratid ammonites in which there is a strong tendency for the umbilical seam to egress and the narrow subtabulate keeled venter to become fastigiate in later growth. Upper Albian biostratigraphy is discussed and a new zonation proposed with the introduction of the Goodhallites goodhalli Zone (=binum + choffati subzones) to emphasize the importance of arestoceratines to upper Albian biostratigraphy. The group is highly provincialized, and the new genus Lobitoceras is introduced for a member from the upper Albian of Angola. Sexual dimorphism is addressed, and the problem of recognizing dimorphic pairs is discussed. In addition the new genus Moutaiceras is created for a mortoniceratine from the uppermost Albian of Angola incorrectly-assigned to Arestoceras.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 88, August 2018, Pages 302-324
نویسندگان
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