Gilles Cuny

This book invites the reader to take a unique journey through the history of the Solar System, the Earth, its evolving biodiversity and ecosystems, and the current state of the planet. It is an attempt to stimulate the reader’s sense of wonder and fascination with our planet: how it was created, the eons before it was populated by ourselves, how organic life, including humans, developed and evolved, and some of the threats we face during the Late Holocene. The Origins of All Things is well suited for teaching purposes, as it offers a synoptic, well-supported overview of key issues in biology and geology, and an easy introduction to key publications that broaden the scope of each chapter. The book is relevant for students of biology, geography, geology and anyone interested in the origin of life on Earth and its evolution.

Chondrichthyans possess unique anatomical features compared to other vertebrates, in particular a fully cartilaginous skeleton and a permanently renewed dentition. These characteristics make the fossilization of whole bodies difficult and consequently their fossil record consists mainly of a large number of isolated teeth. The study of their dentition is therefore of primary interest for our understanding of the evolution of this group. Beyond the dental morphology, the structure of the tissues composing the dentition has proved an important source of information, sometimes difficult to interpret, on the eating habits and the paleobiology of these animals. This book makes a thorough review of the existing theories in this field of research as well as introducing new elements from more recent studies. Through close reference to the fossil record of ancient selachians it examines what the study of dental tissue in cartilaginous fish can tell us about the evolution and the past biology of these animals, as well as what we can learn about the evolution of teeth themselves.