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Found 40 results

  1. Free Access pdf link: https://www.tandfonline.com/doi/pdf/10.1080/08912963.2020.1861608?needAccess=true Shimada, K., Bonnan, M. F., Becker, M. A., Griffiths, M. L. (2021). Ontogenetic growth pattern of the extinct megatooth shark Otodus megalodon—implications for its reproductive biology, development, and life expectancy. Historical Biology. Abstract: The extinct megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), is known primarily from its gigantic teeth in the late Neogene marine fossil record. It is known to reach at least 14.1‒15.3 m in length, but its reproductive biology and ontogenetic growth pattern have remained largely in the realm of speculation. Here, we examined incremental growth bands in fossil vertebrae of a 9.2-m-long individual O. megalodon, revealing that the shark was born large, 2 m in length, and died at age 46. This large size at birth is characteristic of lamniform sharks and is indicative of live-bearing reproduction along with embryos’ intrauterine cannibalism behaviour in the form of oophagy. The trajectory of the generated growth curve beyond the age of death and the maximum length (about 15 m) calibrated from the largest known teeth of O. megalodon suggest that the species had a lifespan of at least 88–100 years with an average growth rate of about 16 cm/yr at least for the first 46 years. As one of the largest carnivores that ever existed on Earth, deciphering such growth parameters of O. megalodon is critical to understand the role large carnivores play in the context of the evolution of marine ecosystems.
  2. Simosuchus ct anatomy

    Hello together, I am not entirely sure if the fossil ID section is the right place for this, but I am hoping for information on a fossil specimen, its not one I hold in hands, but a ct scan, and I think I may not post pictures because they are copyrighted. While looking for new inspirations for my model building I took a close look at this wonderful ct scan of a Simosuchus clarki skull. A pugnosed crocodile, how sweet is that? I wonder two things: -how is that bilateral bone called that in many crocodiles protrudes downwards from the skullbase reaching between the mandibles? -Could the fragile structure of the distal end of said bone hint at a juvenile animal? In recent croc skulls I have seen these bones seemed quite solid. The species description says several specimens in a range of sizes have been found, all below one meter and considered fully grown. on the Digimorph site there are videos showing rotation and cross-sections, the structure in question is best visible in the "roll"-vid: http://digimorph.org/specimens/Simosuchus_clarki/ Thanks and Regards, J
  3. let.12391.pdf Unique near isometric ontogeny in the pterosaur Rhamphorhynchus suggests hatchlings could fly DAVID W. E. HONE , JOHN M. RATCLIFFE, DANIEL K. RISKIN, JOHN W. HERMANSON AND ROBERT R. REISZ lethaia,ahead-of print/2020 taxonomy:following Bennett(1995)* *or: all Solnhofen R. are R.Muensteri edited by user,17.23h ,European time:minor correction in Hone's name
  4. Cyrtinopsis and Kozlowskiella

    PDF Th.F. Krans LEIDSE GEOLOGISCHE MEDEDELINGEN, Deel 47, Aflevering 1, pp. 99—113, 1-11-1971 The relation between the genera Cyrtinopsis Scupin, 1896 and Kozlowskiellina Boucot 1957 HIGHLY recommended,(no chauvinism involved,BTW) The underlined "from" is,in my opinion,a clear Dutchism,and probably should read "of" SIZE: 4,05MB
  5. recent cephalopod life history

    s9.pdf Hatch-as-hatch-can: tricks of the trade in coleoid hatchlings (Mollusca: Cephalopoda) Sigurd von Boletzky N. Jb. Geol. Paläont. Abh. 266/1, 67–76/2012
  6. link Reassessment of a juvenile Daspletosaurus from the Late Cretaceous of Alberta, Canada with implications for the identifcation of immature tyrannosaurids Jared T.Voris, Darla K. Zelenitsky, François Therrien & Philip J. Currie NATURE Scientific Reports | (2019) 9:17801 | https://doi.org/10.1038/s41598-019-53591-7
  7. Tooth Shape Paper

    Frenchetal.17-toothontogeneticmorphologyinwhitesharks.pdf Journal of Fish Biology (2017) 91, 1032–1047 The tooth, the whole tooth and nothing but the tooth: tooth shape and ontogenetic shift dynamics in the white shark Carcharodon carcharias G. C. A. French, M. Stürup, S. Rizzuto, J. H. Van Wyk,D. Edwards, R. W. Dolan, S. P. Wintner A. V. Towner and W. O. H. Hughes BTW:that's a horrible pun to inflict on humanity From the text: "One of the major limitations in establishing the ontogenetic relationships between morphology, diet and maturity, especially in threatened species, is sample size." And that's in the Recent,folks. Is sample size in fossils my hang up,then? Because I keep harping on about it? (my shrink keeps gesturing..
  8. Somehow,I think we're in Kansas

    MATZKE-lagerstniobrarepturt2007usa-Palaeontology.pdf [Palaeontology, Vol. 50, Part 3, 2007, pp. 669–691] AN ALMOST COMPLETE JUVENILE SPECIMEN OF THE CHELONIID TURTLE CTENOCHELYS STENOPORUS (HAY, 1905) FROM THE UPPER CRETACEOUS NIOBRARA FORMATION OF KANSAS,USA by ANDREAS T. MATZKE provenance:possibly Logan County
  9. histology and osteology:hadrosauridae

    Bail Chondroid bone in dinosaur embryos and nestlings (Ornithischia: Hadrosauridae): Insights into the growth of the skull and the evolution of skeletal tissues Alida M.Bailleul, Catherine Nyssen-Behets,Benoît Lengelé,Brian K.Hall,John R.Horner Comptes Rendus Palevol Volume 15, Issues 1–2, January 2016, Pages 49-64 about 8,1 MB recommended
  10. cretaceous,USA,Pisces

    A new large Late Cretaceous lamniform shark from North America, with comments on the taxonomy, paleoecology, and evolution of the genus Cretodus Kenshu Shimada &Michael J. Everhart Article: e1673399 | Received 30 Nov 2018, Accepted 09 Sep 2019, Published online: 18 Nov 2019 LINK (description of Cretodus houghtonorum n.sp) edit:5,30 MB,or thereabouts relevant: Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character Vol. 210 (1921), pp. 311-407 V I I I .— On the Calcification o f the Vertebral Centra in Sharks and Rays. B y W . G. R id e w o o d, D.Sc. 18 MB!!
  11. To all the shark expert of the forum. Is there any method or features to look for in order to determine if a shark tooth comes from a juvenile or an adult. I know that in a species well documented or largely collected, it can be easily determined by the size of the tooth. However in the case of a not well- documented or isolated tooth, is there a feature that could hint for the development stage of the specimen? Thank you, David
  12. get your teeth into this

    Development and Evolution of Dentition Pattern and Tooth Order in the Skates And Rays (Batoidea; Chondrichthyes) Charlie J. Underwood,*, Zerina Johanson,, Monique Welten,, Brian Metscher,Liam J. Rasch,, Gareth J. Fraser,, Moya Meredith Smith Citation: Underwood CJ, Johanson Z, Welten M, Metscher B, Rasch LJ, Fraser GJ, et al. (2015) Development and Evolution of Dentition Pattern and Tooth Order in the Skates And Rays (Batoidea; Chondrichthyes). PLoS ONE 10(4): e0122553. https://doi.org/10.1371/journal.pone.0122553 given the collective NOUS and expertise of the authors:DO NOT MISS THIS ONE!!!
  13. deep sclerochronology

    robiproufliersclerogeochemDSRDSRII2014.pdf The geochemistry of deep-sea coral skeletons: A review of vital effects and applications for palaeoceanography Laura F. Robinson, Jess F. Adkins , Norbert Frank , Alexander C. Gagnon ,Nancy G. Prouty , E. Brendan Roark , Tina van de Flierdt Deep Sea Research 99,2013
  14. Bagaceratops ontogeny

    Hi, Is there a copy of the following paper that anyone would like to send me: Łukasz Czepiński (2019). Ontogeny and variation of a protoceratopsid dinosaur Bagaceratops rozhdestvenskyi from the Late Cretaceous of the Gobi Desert. Historical Biology: An International Journal of Paleobiology. in press. doi:10.1080/08912963.2019.1593404. With respect to Bagaceratops ontogeny, there's been previous rumblings in the literature about Gobiceratops, Lamaceratops, Magnirostris, and Platyceratops being just individual or growth stages of Bagaceratops because they're not just similar but also based each on 1 specimen.
  15. What brought this on, pt 2

    hirasawanatuaeomms3107.pdf less than 3 Mb(obviously) The endoskeletal origin of the turtle carapace Tatsuya Hirasawa, Hiroshi Nagashima & Shigeru Kuratani NATURE COMMUNICATIONS | 4:2107 | DOI: 10.1038/ncomms3107 |www.nature.com/naturecommunications Amazing,if only(but not restricted to)for the link between neontology and paleontology. @Tidgy's Dad
  16. devonian bryozoa of the United States

    BOAR Trepostomatous Bryozoa of the Hamilton Group of New York State By RICHARD S. BOARDMAN GEOLOGICAL SURVEY PROFESSIONAL PAPER 340 about 25 MB HIGHLY RECOMMENDED Among the subjects covered: Stereotoechid wall structure.__.--_---____ 30 Leioclemid wall structure_---_------_-___ 30 Trachytoechid wall structure.------------ 31 Leptotrypellid wall structure _____________ 32 Atactotoechid wall structure__-_-____.___ 32 Zoarial growth and taxonomy. ___________________ 33 Distribution of morphologic characters within Hamilton zoaria.--_--------------___-____ 33 Zoarial variation and species criteria. ____---__ 35 Mode of ramose zoarial growth.___________________ 38 People like Boardman,McKinney,Lidgard and Taylor got me interested in Bryozoa,back in the days
  17. Who are you calling dimorphic

    Parent_1997-Geobios.pdf Ontogeny and Sexual dimorphism of Eurycephalites gottschei(Tornquist)(Ammonoidea) of the Andean Lower Callovian(Argentine-Chile) Geobios 30-3,30-6-1997 recommended? You bet!! Avoid if allergic to quantitative analytic data treatment
  18. so what brought this on?

    Gaspard Daniele Gaspard Growth stages in Articulate brachiopod shells and their relation to biomineralization in: Brachiopods through time Proceedings of the Second International Brachiopod Congress,Dunedin,New Zealand/1990 edited by D.I.Mckinnon,D.E.Lee,J.D.Campbell recommended? you bet Do not simplistically assume more or less linear relations in the accretionary growth of marine invertebrates!!! I have posted before on the relation between size/shape/ontogeny/life history/ecology( I think)
  19. African theropoda

    lakinlongrichspinosaujuvenilmoroc1-theropafricadinosontogs2.0-S0195667118302052-main.pdf Rebecca J.Lakin, Nicholas Longrich: Juvenile spinosaurs (Theropoda.Spinosauridae) from the Middle Cretaceous of Morocco and implications for spinosaur ecology. 3,77 Mb Recommended, given authors and source publication (Els**ier's editorial policies are strict and thorough, as such things go.) Note: co-coccurence of adult and juveniles. Enjoy, dinosaur lovers.
  20. intriguing Sarmatian bryozoan

    pauldtayontoanbryozLBB_0038_1_0055-0064.pdf About 0,71 MB Recommended ,not in the least because of the stature of the first author. Short,well illustrated,informative Taylor et al:Unusual Early Development in A cyclostome bryozoan from the Ukrainian Miocene Linzer Biol.Beitr.38/1,2006
  21. Variation in Mesozoic cephalopoda

    morardguex081-090.pdf Bull.Soc.Geol.Fr,t.174-6/2003: Ontogeny and covariation in the Toarcian genus Osperleioceras
  22. Death ray

    Giuseppe Marramà, Kerin M. Claeson, Giorgio Carnevale & Jürgen Kriwet(about 4 Mb) (2018) Revision of Eocene electric rays (Torpediniformes, Batomorphii) from the Bolca Konservat- Lagerstätte, Italy, reveals the first fossil embryo insitu in marine batoids and provides new insights into the origin of trophic novelties in coral reef fishes, Journal of Systematic Palaeontology, 16:14, 1189-1219, DOI: 10.1080/14772019.2017.1371257 Sensitive people should beware of figs. 15 and 16 I resisted the temptation (lover of classic photography) to work Man Ray in there somewhere
  23. Tylosaurus Skulls Described

    The attached paper describes the partial and complete skulls of the mosasaur Tylosaurus proriger from the Niobrara Formation of Kansas https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29339
  24. Theropods and heterochronic processes

    curpodam-the-upper.pdf 1,22 MB, and worth your while Recommended
  25. The paleobiology of a winged reptile

    wankelhamiptchina.full.pdf 2,3 Mb Recommended, and then some
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