Ontogeny and life history of a large lamniform shark from the Early Cretaceous of North America |
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| Institution: | 1. University of Oklahoma, Department of Biology, 730 Van Vleet Oval, Room 314, Norman, OK 73019, USA;2. University of Oklahoma Health Sciences Center, Department of Medical Imaging and Radiation Sciences, 1200 North Stonewall, AHB-3021, Oklahoma City, OK 73117-1215, USA;3. Sam Noble Oklahoma Museum of Natural History, 2401 Chautauqua Ave Norman, OK 73072-7029, USA;1. Arabako Natur Zientzien Museoa/Museo de Ciencias Naturales de Álava, Siervas de Jesús 24, E–01001 Vitoria–Gasteiz, Spain;2. Universidad del País Vasco/Euskal Herriko Unibertsitatea, Facultad de Ciencia y Tecnología, Departamento de Estratigrafía y Paleontología, Apartado 644, 48080 Bilbao, Spain;3. ISEM, CNRS UMR 5554, Université de Montpellier, Place Eugène Bataillon, F–34095 Montpellier Cedex 5, France;1. Department of Geological Engineering, Middle East Technical University, 06800, Ankara, Turkey;2. School of Science, Penn State Behrend, 4205 College Drive, Erie, PA 16563, USA;3. Çal?k Enerji, Oil and Gas Directorate, 06520, Sö?ütözü-Ankara, Turkey;4. University of Vienna, Department of Geodynamics and Sedimentology, 1090, Austria;5. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9, Canada;1. Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA;2. Department of Environmental Science and Studies, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA;3. Sternberg Museum of Natural History, Fort Hays State University, 3000 Sternberg Drive, Hays, KS 67601, USA;1. Dept. of Evolutionary Anthropology, Duke Univ., Durham, NC, USA;2. Dept. of Sociology & Anthropology, Metropolitan State Univ. of Denver, Denver, CO, USA;3. Formerly at Dept. of Exercise Science, High Point Univ., High Point, NC, USA;4. Southwest Fisheries Science Center, National Marine Fisheries Service, NOAA, La Jolla, CA, USA;5. Northeast Fisheries Science Center, National Marine Fisheries Service, NOAA, Narragansett, RI, USA;6. Dept. of Cell and Developmental Biology, Feinberg School of Medicine and Simpson Querrey Inst., Northwestern Univ., Chicago IL, USA |
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| Abstract: | Due to an incomplete fossil record, little is known about lamniform shark life history from the Early Cretaceous of North America. Recent discoveries have shown that during this time, some lamniformes reached gigantic sizes (>6–8 m in total length) not seen in earlier species. Given the importance of life history to understand how organisms reach such sizes, we conducted an ontogenetic analysis on three very large shark vertebrae, representing a single individual from the Lower Cretaceous (Albian) Duck Creek Formation of Texas. Using three different techniques (computed tomography, histological sectioning, and surface texture analysis), we were able to show that this individual was born at a relatively small size and subsequently grew at rapid rate, achieving a total length of over 6.3 m in approximately 18 years; a rate not observed in any other Cretaceous species. Comparison of the different aging techniques yielded complementary results; however, surface texture analysis produced the most complete ontogenetic record for this specimen. More work is needed to determine broad patterns in the life history evolution of giant Early Cretaceous lamniform sharks. |
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| Keywords: | Chondrichthyes Lamniformes Ontogeny Early Cretaceous |
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