By W. Stuart McKerrow

ISBN-10: 0262131447

ISBN-13: 9780262131445

Approximately 1,000 consultant species were pictured, every one in its group with sure geological provenance; typically an analogous or heavily related kinds may be present in such a lot components of the realm

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Approximately 1,000 consultant species were pictured, every one in its group with certain geological provenance; often an identical or heavily comparable types might be present in such a lot components of the area

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In this connection, it is relevant to note that animal groups (like the graptolites, fish and corals) where the skeleton is not for external protection, do not appear until after the Lower Cambrian. Stanley (1976) considered that the known Cambrian faunas could all be descended from the animals represented in the Ediacara fauna. He pointed out that, during the first part of Early Cambrian time (the Tommotian), the only groups additional to those in the Ediacara fauna were: hexactinellid sponges, archaeocyathids, inarticulate brachiopods, gastropods, hyolithids, and a few problematical groups.

It includes the Palaeozoic spiny sharks (Acanthodii), the lungfish and the Crossopterygians (some of which were ancestral to the first amphibians) and all the other bony fishes. The actinopterygian bony fishes include the Chondrostei, the Holostei and the Teleostei. The chondrosteans were common in the Upper Palaeozoic and Triassic. The holosteans were the dominant bony fishes in the Mesozoic. During the Cretaceous the teleosts became more common, and were the dominant fish of the Cenozoic. The ear-bones of bony fishes are known as otoliths.

The four genera illustrated all occur in the Tremadoc, a time division which is placed at the end of the Cambrian in Britain, but at the start of the Ordovician in some parts of the world. Euloma is similar to its older relative Solenopleura. Agnostus is a small trilobite (usually less than 1cm long) which is often found with its tail folded up under its head, though it was probably a deposit feeder like many other trilobites and may only have curled up when threatened. Although nothing is known of the limbs of Agnostus, there is good reason to believe that Agnostus swam near the sea floor, in the same way as many arthropods today.

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The Ecology of fossils : an illustrated guide by W. Stuart McKerrow

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