Abstract
The origin of tetrapods is one of the longest standing (and still not fully resolved) fields in vertebrate evolution (Thomson, 1993). The discovery of living lungfishes in the nineteenth century sparked interest because of their apparent intermediate position between other kinds of fishes and amphibians. (As is well known, the South American lungfishLepidosirenwas actually first described as a degenerate amphibian.) The discovery of the Australian lungfish provided a direct link between a living form (a “living fossil” to use Darwin's term) and well-known Triassic fossils. The lungfishes therefore accorded well with Darwinian theory, just as didArchaeopteryx. The discovery of the living coelacanthLatimeriain 1938 continues to spark public interest (Thomson, 1991a).
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