The Role of Ammonites in the Mesozoic Marine Food Web Revealed by Jaw Preservation

Kruta, Isabelle; Landman, Neil H.; Rouget, Isabelle; Cecca, Fabrizio; Tafforeau, Paul

doi:10.1126/science.1198793

Cited by 136 publications

(170 citation statements)

References 14 publications

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“…Recently, Kruta et al (2011) were able to present a reconstruction of a full buccal apparatus, including the radula, of a Mesozoic ammonite (Baculites, Upper Cretaceous) using SRµCT technology, where most of the single radula tooth elements had a size of 500 µm. In order to compare the results of an SRµCT scan with other CT techniques we used three different juvenile ammonites of ?Cadoceras sp.…”

Section: Synchrotron Radiation Based Micro-computed Tomography (Srµct)mentioning

confidence: 99%

Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research

et al. 2014

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Abstract. Several non-invasive methods are common practice in natural sciences today. Here we present how they can be applied and contribute to current topics in cephalopod (paleo-) biology. Different methods will be compared in terms of time necessary to acquire the data, amount of data, accuracy/resolution, minimum/maximum size of objects that can be studied, the degree of post-processing needed and availability. The main application of the methods is seen in morphometry and volumetry of cephalopod shells. In particular we present a method for precise buoyancy calculation. Therefore, cephalopod shells were scanned together with different reference bodies, an approach developed in medical sciences. It is necessary to know the volume of the reference bodies, which should have similar absorption properties like the object of interest. Exact volumes can be obtained from surface scanning. Depending on the dimensions of the study object different computed tomography techniques were applied.

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Section: Synchrotron Radiation Based Micro-computed Tomography (Srµct)mentioning

confidence: 99%

Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research

et al. 2014

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“…Fossilized chitinous and calcareous remains of cephalopod jaws have been discovered from the Devonian and younger marine deposits (Tanabe and Fukuda 1999;Tanabe et al in press). They usually occur solitarily but are occasionally found in situ within the body chambers of ammonoids (e.g., Lehmann 1976Lehmann , 1980Lehmann , 1990Tanabe and Landman 2002;Kruta et al 2011;Tanabe et al 2013) and nautilids (e.g., Dietl and Schweigert 1999;Klug 2001). Flattened jaws have also been preserved in situ in the buccal portion of exceptionally well-preserved late Palaeozoic and Mesozoic coleoid fossils retaining soft tissue remains (Saunders and Richardson 1979;Klug et al 2005;Fuchs 2006a, b;Mapes et al 2010;Fuchs and Larson 2011a, b).…”

Section: Editors' Choicementioning

confidence: 99%

Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

2011

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Morphologic analyses of a large collection of coleoid cephalopods from the Lebanese Upper Cretaceous yielded a much higher diversity than previously assumed and revealed numerous extraordinarily well-preserved, soft-part characters. An analysis of the Prototeuthidina, a gladius-bearing group with a slender torpedo-shaped body, revealed two species:Dorateuthis syriacaandBoreopeltis smithin. sp. Previously unknown soft-part characters, such as the digestive tract, the gills, and the cephalic cartilage considerably improved our knowledge ofD. syriaca.Since none of the investigated specimens show more than eight arms, similarities with modern squids are regarded as superficial.Boreopeltis smithin. sp. is erected on the basis of its comparatively wideParaplesioteuthis-like gladius. The latter species represents the first unambiguous record of this genus in Upper Cretaceous deposits. Phylogenetic analyses indicate that the prototeuthidid clade consists of two lineages. The plesioteuthidid lineage originates from early JurassicParaplesioteuthisand leads toPlesioteuthisandDorateuthis.The other lineage is morphologically more conservative and leads toBoreopeltis.

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“…A pink beam at an energy of 60 keV, using a cubic voxel of 7.46 μm (beamline ID19; ESRF), was also used to scan the skull of P. concinna. This method has been proven to be very useful for accurate imaging of small elements (38,39) such as teeth (40). Noninvasive virtual extraction of entire teeth (i.e., crown and roots) is also permitted (41).…”

Section: Methodsmentioning

confidence: 99%

Continuous dental replacement in a hyper-chisel tooth digging rodent

Rodrigues

Marangoni

Šumbera

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Contrary to their reptilian ancestors, which had numerous dental generations, mammals are known to usually develop only two generations of teeth. However, a few mammal species have acquired the ability to continuously replace their dentition by the constant addition of supernumerary teeth moving secondarily toward the front of the jaw. The resulting treadmill-like replacement is thus horizontal, and differs completely from the vertical dental succession of other mammals and their extinct relatives. Despite the developmental implications and prospects regarding the origin of supernumerary teeth, this striking innovation remains poorly documented. Here we report another case of continuous dental replacement in an African rodent, Heliophobius argenteocinereus , which combines this dental system with the progressive eruption of high-crowned teeth. The escalator-like mechanism of Heliophobius constitutes an original adaptation to hyper-chisel tooth digging involving high dental wear. Comparisons between Heliophobius and the few mammals that convergently acquired continuous dental replacement reveal that shared inherited traits, including dental mesial drift, delayed eruption, and supernumerary molars, comprise essential prerequisites to setting up this dental mechanism. Interestingly, these dental traits are present to a lesser extent in humans but are absent in mouse, the usual biological model. Consequently, Heliophobius represents a suitable model to investigate the molecular processes leading to the development of supernumerary teeth in mammals, and the accurate description of these processes could be a significant advance for further applications in humans, such as the regeneration of dental tissues.

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The Role of Ammonites in the Mesozoic Marine Food Web Revealed by Jaw Preservation

Cited by 136 publications

References 14 publications

Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research

Non-invasive imaging methods applied to neo- and paleo-ontological cephalopod research

Diversity, morphology, and phylogeny of coleoid cephalopods from the Upper Cretaceous Plattenkalks of Lebanon-Part I: Prototeuthidina

Continuous dental replacement in a hyper-chisel tooth digging rodent

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