The Geographical Distribution of Animals: With a Study of the ..., volume 2
The Geographical Distribution of Animals: With a Study of the ..., volume 2
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Next comes the Neo- tropical region with 2 families . and fi peculiar genera ; the Australian with 3, and the Nearctic with 2 peculiar genera; while the Oriental and Palaearctic regions possess none that are peculiar. There are about 30 genera and 200 species in the whole order.
' Fossil Chelonia. — The earliest undoubted remains of this order occur in the Upper Oolite. These belong to the Cheloniidae and Emydidse, which are also found in the Chalk. In the Tertiary beds Chelonia are more abunda...nt, and the Trionychidae now appear. The Testudinid® are first met with in the Miocene formation of Europe and the Eocene of North America, the most remarkable being the gigantic Colossochelys Atlas of the Siwalik Hills. It appears, therefore, that the families of the order Chelonia were already specialised in the Secondary period, a fact which, together with their more or less aquatic habits, sufficiently accounts for their generally wide distribution.
Species of Testudo, Emys, and Trionyz, are found in the Upper Miocene of the south of France.
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To quickly assess the difficulty of the text, read a short excerpt:
Next comes the Neo- tropical region with 2 families . and fi peculiar genera ; the Australian with 3, and the Nearctic with 2 peculiar genera; while the Oriental and Palaearctic regions possess none that are peculiar. There are about 30 genera and 200 species in the whole order.
' Fossil Chelonia. — The earliest undoubted remains of this order occur in the Upper Oolite. These belong to the Cheloniidae and Emydidse, which are also found in the Chalk. In the Tertiary beds Chelonia are more abunda...nt, and the Trionychidae now appear. The Testudinid® are first met with in the Miocene formation of Europe and the Eocene of North America, the most remarkable being the gigantic Colossochelys Atlas of the Siwalik Hills. It appears, therefore, that the families of the order Chelonia were already specialised in the Secondary period, a fact which, together with their more or less aquatic habits, sufficiently accounts for their generally wide distribution.
Species of Testudo, Emys, and Trionyz, are found in the Upper Miocene of the south of France.
What to read after The Geographical Distribution of Animals: With a Study of the ..., volume 2?
You can find similar books in the "Read Also" column, or choose other free books by Wallace, Alfred Russel, 1823-1913 to read onlineMoreLess
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