By W. Stuart McKerrow
Approximately 1,000 consultant species were pictured, every one in its group with certain geological provenance; often a similar or heavily related kinds might be present in such a lot elements of the area
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Extra info for The Ecology of fossils : an illustrated guide
Subclass LEPIDOSAURIA (Permian to Present) Includes the lizards, the snakes and the lizard-like rhynchosaurs. subclass ARCHOSAURIA (Permian to Present) The ancestral thecodonts gave rise to the dinosaurs, which included many varied types which were dominant on the land during the Mesozoic. This subclass also includes the crocodiles and the winged pterosaurs. subclass EURYAPSIDA (Permian to Cretaceous) Mostly aquatic or amphibious, this subclass includes the early and relatively unspecialized nothosaurs, the long-necked plesiosaurs with paddle-like legs, the short-necked pliosaurs, and the fishshaped ichthyosaurs.
However, in some other olenids the eyes are spherical and lie far back, or down on the sides of the head, much increasing the all-round field of vision. Ctenopyge has many prominent spines, and probably swam just above the sediment surface. None of these trilobites burrowed; there was probably an abundance of organic food on the sea floor. Their problem would not have been a shortage of food, but a shortage of oxygen for respiration. Compared with other trilobite groups, olenids have a relatively large number of segments and, since each segment would have had its own gill branch, this would no doubt have assisted them to obtain enough oxygen.
The paucity of fossils worms contrasts with their abundance in modern marine environments; they include free-swimming, crawling, sessile and burrowing animals. They also have a variety of feeding habits; in addition to the filter-feeding majority, they include carnivores and scavengers. The sipunculid worms (Cambrian to Present) are assigned to a separate phylum from the annelids. Their bodies are not segmented, and most of them narrow anteriorly; the anterior extension is retractable and bears tentacles.
The Ecology of fossils : an illustrated guide by W. Stuart McKerrow