کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4747784 1359933 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Re-evaluation of squaloid shark records from the Albian and Cenomanian of Lithuania
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
Re-evaluation of squaloid shark records from the Albian and Cenomanian of Lithuania
چکیده انگلیسی
In 1935, Dalinkevičius described and illustrated several teeth of squaloid sharks from Lithuania, originating from deposits considered by him to be of Cenomanian and Turonian age. To date, these strata are known to be of late Albian and late Cenomanian age, respectively. A re-examination of the original collection, together with an analysis of newly collected material, allows these squaloid teeth to be identified as Protosqualus glickmani Averianov, 1997, Squalus sp., Squaliodalatias sp. and Protocentrophorus balticus (Dalinkevičius, 1935) nov. gen., morphologically different from the extant genus Centrophorus. The present material also enables a detailed insight into the first evolutionary stages of deep-sea squaloid sharks, confirmation of the most recent phylogenetic hypotheses regarding extant taxa (e.g., dalatiids being no more derived than other 'modern-type' squaloid families) and identification of a possible centre of origin of such sharks in Boreal Europe and the Central Asian seaway.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 29, Issue 4, August 2008, Pages 711-722
نویسندگان
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