کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4746857 1642066 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dinosaur eggshell assemblage from Japan reveals unknown diversity of small theropods
ترجمه فارسی عنوان
مجموعه ی تخم مرغ دایناسور از ژاپن تنوع ناشناخته تروپود کوچک را نشان می دهد
کلمات کلیدی
دایناسور، برآورد توده تخم مرغ، تخم مرغ ژاپن، کرتاسه پایین گروه ساسایاما
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
چکیده انگلیسی


• We describe a diverse dinosaur eggshell assemblage from Japan.
• Five different ootaxa, assignable to theropods and ornithopods were identified.
• Nipponoolithus ramosus oogen. et oosp. nov. was erected as a new ootaxon.
• This study reveals a hidden diversity of small theropods in Lower Cretaceous Japan.

The Lower Cretaceous (Albian) Sasayama Group in the Hyogo Prefecture of southwestern Japan has yielded various vertebrate fossils, including skeletal remains of dinosaurs, anurans, lizards, and mammals, and recently eggshell fragments. Here we report on numerous fossil eggshells from the bone-bearing Kamitaki locality in Tamba City, which represents a diverse dinosaur eggshell assemblage. Of the more than 90 eggshell fragments recovered, five different types were identified, including eggshells that likely belong to a variety of theropods (Nipponoolithus ramosus oogen. et oosp. nov., Elongatoolithus sp., Prismatoolithus sp., and Prismatoolithidae indet.) and at least one ornithopod (Spheroolithus sp.). All eggshells are relatively thin, and a new derived estimation method correlating egg mass with eggshell thickness indicates that they are among the smallest (28–135 g) theropod eggs known, likely laid by small bodied forms. The eggshell assemblage from this locality suggests that a diverse small dinosaur fauna, consisting primarily of theropods, nested in the region, a diversity yet to be evidenced from skeletal remains in Japan.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 57, January 2016, Pages 350–363
نویسندگان
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