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  • 1.
    Bazzi, Mohamad
    et al.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi.
    Kear, Benjamin P.
    Uppsala universitet, Enheten för musik och museer, Evolutionsmuseet.
    Blom, Henning
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
    Ahlberg, Per
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
    Campione, Nicolas E.
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi. Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Paleobiologi. Univ New England, Sch Environm & Rural Sci, Palaeosci Res Ctr, Armidale, NSW 2351, Australia.
    Static Dental Disparity and Morphological Turnover in Sharks across the End-Cretaceous Mass Extinction2018Ingår i: Current Biology, ISSN 0960-9822, E-ISSN 1879-0445, Vol. 28, nr 16, s. 2607-2615Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Cretaceous-Palaeogene (K-Pg) mass extinction profoundly altered vertebrate ecosystems and prompted the radiation of many extant clades [1, 2]. Sharks (Selachimorpha) were one of the few larger-bodied marine predators that survived the K-Pg event and are represented by an almost-continuous dental fossil record. However, the precise dynamics of their transition through this interval remain uncertain [3]. Here, we apply 2D geometric morphometrics to reconstruct global and regional dental morphospace variation among Lamniformes (Mackerel sharks) and Carch-arhiniformes (Ground sharks). These clades are prevalent predators in today's oceans, and were geographically widespread during the late Cretaceous-early Palaeogene. Our results reveal a decoupling of morphological disparity and taxonomic richness. Indeed, shark disparity was nearly static across the K-Pg extinction, in contrast to abrupt declines among other higher-trophic-level marine predators [4, 5]. Nevertheless, specific patterns indicate that an asymmetric extinction occurred among lamniforms possessing lowcrowned/triangular teeth and that a subsequent proliferation of carcharhiniforms with similar tooth morphologies took place during the early Paleocene. This compositional shift in post-Mesozoic shark lineages hints at a profound and persistent K-Pg signature evident in the heterogeneity of modern shark communities. Moreover, such wholesale lineage turnover coincided with the loss of many cephalopod [6] and pelagic amniote [5] groups, as well as the explosive radiation of middle trophic-level teleost fishes [1]. We hypothesize that a combination of prey availability and post-extinction trophic cascades favored extant shark antecedents and laid the foundation for their extensive diversification later in the Cenozoic [7-10].

  • 2.
    Conte, Gabriele Larocca
    et al.
    Univ Bologna, Dipartimento Sci Biol Geol & Ambientali, Alma Mater Studiorum, Via Zamboni 67, I-40126 Bologna, Italy.
    Fanti, Federico
    Univ Bologna, Dipartimento Sci Biol Geol & Ambientali, Alma Mater Studiorum, Via Zamboni 67, I-40126 Bologna, Italy;Univ Bologna, Museo Geol Giovanni Capellini, Alma Mater Studiorum, Via Zamboni 63, I-40126 Bologna, Italy.
    Trevisani, Enrico
    Museo Civ Storia Nat Ferrara, Via De Pisis 24, I-44121 Ferrara, Italy.
    Guaschi, Paolo
    Univ Pavia, Museo Storia Nat, Piazza Botta 9-10, I-27100 Pavia, Italy.
    Barbieri, Roberto
    Univ Bologna, Dipartimento Sci Biol Geol & Ambientali, Alma Mater Studiorum, Via Zamboni 67, I-40126 Bologna, Italy;Univ Bologna, Museo Geol Giovanni Capellini, Alma Mater Studiorum, Via Zamboni 63, I-40126 Bologna, Italy.
    Bazzi, Mohamad
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för organismbiologi, Evolution och utvecklingsbiologi.
    Reassessment of a large lamniform shark from the Upper Cretaceous (Santonian) of Italy2019Ingår i: Cretaceous research (Print), ISSN 0195-6671, E-ISSN 1095-998X, Vol. 99, s. 156-168Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    To date, only a few partially articulated chondrichthyan specimens are known from the Upper Cretaceous marine fossil record of northern Italy. Here, we re-evaluate the taxonomic status and geological age of selachian remains originally discovered during the 19th century from the Castellavazzo locality. The described specimen is largely embedded in matrix with minute exposure of joined and moderately deformed sequentially stacked vertebral centra. Computed tomography (CT) image-data obtained of the specimen enabled the identification of potential cranial-cartilage elements located in close proximity to teeth and are here interpreted as remnants of the jaws. Based on tooth and vertebral morphology the specimen is in all likelihood an adult lamniform shark with a measured 3.5 m length. Using ordinary least-squares regression analysis (OLS) and proportion-based calculations, we estimated a total-length (TL) of 596.27 and 632.5-672.64 cm respectively. We prefer the size estimation derived through OLS bivariate regression; however, in the present analysis, reliance on a small sample size (n = 11) and evidence for differential scaling between taxa impose limitations on the precision of our size prediction. Planktonic foraminifera examined from the surrounding matrix of the slab preserving shark vertebral centra and teeth indicate a Santonian age (Dicarinella asymetrica zone). Although, the specimen could not confidently be assigned beyond the ordinal-level, the sheer centrum size, gross dental morphology, and depositional environment, are indicative of a pelagic apex-predator comparable to coeval lamniforms, with a specific resemblance towards cretoxyrhinids, reported from elsewhere along the peri-Tethyan shelf of Europe and Western Interior Seaway of North America. Finally, the re-emergence of this historical specimen, here re-described using cutting-edge techniques, is of great importance as it contributes to the otherwise poor record of extinct lamniform shark skeletons.

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