Książki

Fossil teeth from 13 chondrichthyan species spread over the Hexanchiformes, Squaliformes, Squatiniformes, Heterodontiformes and Orectolobiformes orders are displayed and for most a morphological analysis provides a correct determination on the tooth category. The recovered fossils consist of mainly marine specimen like isolated teeth, vertebrae, tooth plates, spines, invertebrates and even land based plant remains. Finds from land mammals and reptiles, and birds were very rare. The extinct species Squalus smithi Herman, 1982b is redefined as a synonym for Squalus minor Daimeries, 1888, the validity of Squatina crassa Daimeries, 1889 is reinstated and the occurrence of Heterodontus in the North Sea basin during the Eocene is revised to one single species (see Migom & Hoedemakers in prep.). Future volumes will comprise studies on other elasmobranchii and holocephali.Keywords: Chondrychthyes, Elasmobranchii, Eocene, Lower Ypresian, Egem, Ampe quarry

The Lower Eocene (Ypresian) Chondrichthyes from Egem, Belgium: Part 1, Orders: Hexanchiformes, Squaliformes, Squatiniformes, Heterodontiformes and Orectolobiformes

Introduction p. 5Materials and Methods p. 5Terminology p. 6Abbreviations p. 6Geological overview of the Ampe Quarry at Egem, Belgium p. 7Tielt Formation p. 8Kortemark Silt Member p. 8Egemkapel Clay Member p. 9Hyon Formation p. 9Egem Sand Member p. 9Gentbrugge Formation p. 10The Pittem Clay Member p. 10Systematic Palaeontology p. 11Order Hexanchiformes Buen, 1926 p. 11Family Hexanchidae Grey, 1851 p. 11Hexanchus agassizi Cappetta, 1976 p. 11Weltonia burnhamensis Ward, 1979 p. 13Notorynchus serratissimus Agassiz, 1843 p. 15Order Squaliformes Goodrich, 1909 p. 17Family Squalidae Bonaparte, 1834 p. 17Squalus minor Leriche, 1905 p. 17Family Dalatiidae Grey, 1851 p. 20Isistius trituratus (Winkler, 1874) p. 20Order Squatiniformes Buen, 1926 p. 20Family Squatinidae Bonaparte, 1838b p. 20Squatina crassa Daimeries, 1889 p. 21Squatina prima (Winkler, 1874) p. 21Order Heterodontiformes Berg, 1937 p. 25Family Heterodontidae Grey, 1851 p. 25Heterodontus vincenti (Leriche, 1905) p. 26Order Orectolobiformes Compagno, 1973 p. 41Family Parascylliidae Gill, 1862b p. 41Pararhincodon ypresiensis Cappetta, 1976 p. 41Family Brachaeluridae Cappetta, 1987 p. 43Eostegostoma angustum (Nolf & Taverne) in Herman, 1977a p. 43Family Ginglymostomatidae Gill, 1862 p. 44Nebrius thielensis (Winkler, 1874) p. 44Protoginglymostoma ypresiensis (Casier, 1946) p. 47Family Rhincodontidae Garman, 1913 p. 47Paleorhincodon wardi Herman, 1974 p. 47Species List p. 49Acknowledgements p. 50References p. 51