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- W1982272074 abstract "The second division of the Lepidoid family of fossil fishes, the Ganoidei homocerci, is distinguished from the first, or Ganoidei heterocerci, by having the more or less symmetrical form of tail common to the generality of existing bony fishes, and to those fossil species (with rare exceptions) found in strata more recent than the Trias. Although this character, derived from the organization of the caudal fin, is one of great value and significance in the determination of various genera of fossil fishes, it is nevertheless necessary, in drawing general conclusions, to be careful not to assign to it more importance than it is strictly entitled to; for we find, by the comparison of several genera, that it is not one of those well-defined trenchant characters which can be affirmed to exist or not, as the case may be, but that it is variable in amount, passing from extreme heterocercy to absolute homocercy by a sliding-scale so gradual, that it is (at all events in fossil examples) most difficult to define a positive line of demarcation between the two forms. The researches of one of the most distinguished naturalists in Europe, Professor Muller, tend to show that as much difficulty prevails in determining this point in recent fishes ; and in his valuable paper on the structure and characters of the Ganoidei, communicated to the Academy of Sciences at Berlin in December 1844, he comes to the conclusion that heterocercy, anatomically considered, passes insensibly into homocercy. As proof of this fact" @default.
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- W1982272074 date "1854-02-01" @default.
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- W1982272074 title "Palichthologic Notes. No. 6. On a Fossil Fish from the Upper Beds of the New Red Sandstone at Bromsgrove" @default.
- W1982272074 doi "https://doi.org/10.1144/gsl.jgs.1854.010.01-02.40" @default.
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