Migom Frederic

The genus Heterodontus in the Early Paleogene of the North Sea Basin and the Landes, France

• Broschiertes Buch

Produktbeschreibung

Type material of the four nominal Palaeocene-Eocene species of Heterodontus from the North Sea Basin, H.¿lerichei Casier, 1943b, Heterodontus vincenti (Leriche, 1905), Heterodontus wardenensis Casier, 1966 and Heterodontus woodwardi Casier, 1946 is restudied, based on a very detailed analysis of H.¿vincenti specimens recovered from the Ypresian of Egem (Belgium) and on morphological, stratigraphical and environmental considerations and on intraspecific and interspecific conclusions from a study on the extant species Heterodontus mexicanus Taylor & Castro-Aguirre, 1972 and Heterodontus quoyi (Frémenville, 1840) (see Migom & Hoedemakers, 2023). This led to the realization that several of the above fossil species represent, in fact, different ontogenetic stages of the same species. In this work, a specimen from the original type series of H.¿vincenti is formally designated as lectotype and other specimens are designated as paralectotypes. Dignathic and gynandric heterodonty is observed in H.¿vincenti and interspecific heterodonty with this species is demonstrated through a comparison with the above Recent species. A partial overview of the ontogenetic characteristics of the Palaeocene H.¿lerichei is presented. Heterodontus adneti nov. sp. is defined for specimens formerly described as Heterodontus cf. vincenti, sensu Adnet (2006). Figured specimens in Adnet (2006) are designated as holotype and paratype. Other putative Heterodontus species are identified from literature but I refrain from formally describing them as these specimens were not studied. Finally, a new set of characteristics, based amongst others on interspecific differences with the above-mentioned extant species, is suggested to identify H.¿vincenti and H.¿lerichei. Keywords: North Sea Basin, Palaeocene, Eocene, Heterodontidae, Heterodontiformes, Heterodontus vincenti, Heterodontus lerichei, Heterodontus adneti nov. sp., tooth morphology, Heterodonty, basal ornamentation, Egem, Erquelinnes, Dormaal.

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Produktdetails

• Palaeo Ichthyologica Nr.17
• Verlag: Pfeil, Dr. Friedrich / Pfeil, Friedrich, Dr.
• Seitenzahl: 60
• Erscheinungstermin: 20. August 2024
• Englisch
• Abmessung: 295mm x 211mm x 10mm
• Gewicht: 282g
• ISBN-13: 9783899372946
• ISBN-10: 3899372948
• Artikelnr.: 71495927

Inhaltsangabe

Introduction 5 Material and methods 5 Terminology 5 Abbreviations 6 Measurements 6 General paleogeographic overview and sedimentationof the NSB and limitrophe areas 7 Analysis of the dental morphology of Heterodontus in the Early Paleogene of the NSB 9 Heterodontus vincenti (Leriche, 1905) 9 Material studied 10 Lectotype (here designated) 10 Paralectotypes (here designated) 10 Other comparative material 10 Type locality and age 10 Descriptions of H.
vincenti from the Egem quarry 10 Analysis of teeth of H.
vincenti from the Egem quarry and comparison with teeth of the extant species H.
mexicanus and H.
quoyi 10 Analysis of the types H.
vincenti, H.
woodwardi and H.
wardenensis 16 Lectotype of H.
vincenti (Leriche, 1905) 16 Paralectotypes of H.
woodwardi Casier (1946) 18 Paralectotypes of H.
wardenensis Casier (1966) 20 Heterodontus lerichei Casier, 1943 23 Material studied 23 Holotype 23 Other material from Dormaal 23 Type locality and age 23 Description of the holotype mediolateral tooth of H.
lerichei Casier, 1943b 24 Descriptions of teeth of H.
lerichei Casier, 1943b from Dormaal 24 Adult dentition 24 Juvenile dentition 29 Heterodontus sp. (IRSNB P.00100) 32 Analysis of teeth of H.
lerichei 32 Heterodontus in the Eocene of the Landes, France 39 Material studied 39 Heterodontus adneti nov sp. 39 Description of the tooth SG26 (Adnet, 2006) 39 Description of the tooth SG27 (Adnet, 2006) 39 Analysis and discussion of teeth of H.
adneti nov. sp. 39 Discussion 41 Earlier studies 41 Palaeogeographic and stratigraphic distribution (earlier studies) 46 Bathymetry (earlier studies) 48 Conclusions 50 Conclusions on teeth of H.
vincenti 50 Conclusions on teeth of H.
lerichei 53 Conclusions on teeth of H.
adneti nov. sp. 54 Conclusions on Earlier Studies 54 Acknowledgements 55 Appendix 56 References 58