File:Guide leaflet (1901) (14767881872).jpg

Identifier: scienceguide7692amer (find matches)
Title: Guide leaflet
Year: 1901 (1900s)
Authors: American Museum of Natural History
Subjects: American Museum of Natural History Natural history
Publisher: New York : The Museum
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: IMLS / LSTA / METRO

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ss,also retains the shark-like form, but its mouth is sucking in type and itsbody covered with bony plates. Two mounts of Russian sturgeon, from w^hich most caviar is ob-tained, are shown in a northw^est w^all case. Only the Garpike (group 3)has inherited the complete armor of rhombic, enamel-covered scales, butits jaws are snipe-like and its skeleton completely bony. The Bowfin(Amia) (group 4) w^hich is a descendant of the later, or New Ganoid,stock, is the most advanced of the series and has almost attained therank of the Teleosts or higher fishes. This group shows the nest madeby the Bowfin in which to deposit its eggs. THE TELEOSTS (Cases 16-36)During the Cretaceous period, when the giant dinosaurs ruled theland, the mail-clad Ganoid fishes were largely crowded out by their morehighly evolved descendants, the Teleosts, who at present constituteabout ninety percent of the fish fauna of the world. The name Teleost,meaning completely bony, refers to the fact that the notochord, or 29
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Fig. 9. Evolution of Fishes in Geologic Time. TUK WORLD OF FISf/FS 31 priinitivo axial rod, of the liirval stages of development is re()laced in tlieadult fishes of this division by complete, bony, checker-like vertebralbodies or centra. Order Isospondyli. (Tarpons, Herrings, Trouts, etc.). ((.ases16, 17): This order, a main subdivision of the Ieleost series, is a ratherloose assemblage of fishes that are higher in rank than the Ganoids butlower than the spiny-finned fishes (Acanthopterygii). It comprises firstsuch veterans as the Bonefish (Albula), the Tarpon, and the Herrings,—all survivors from the dawn of Teleost history in the Cretaceous, and,secondly, the more modernized Trouts, Salmons, etc., which are theyounger scions of an ancient branch and date only from the Miocene m m!MMt

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