“Every species has come into existence coincident both in space and time with a pre-existing closely allied species.”

"On the Law which has Regulated the Introduction of New Species" (1855).

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Alfred Russel Wallace12

British naturalist, explorer, geographer, anthropologist an… 1823–1913

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“While the geneticists were disproving many of Darwin's ideas, the palaeontologists were determining the actual historical facts of evolution. …they were able to verify the law of succession, first explicitly given by Darwin's colleague Wallace. "Every species has come into existence coincident, both in time and space, with a pre-existing closely allied species."”

J. B. S. Haldane book The Causes of Evolution

Introduction, pp.20-21.
The Causes of Evolution (1932)

“Because it is clear from the fossil record that almost every species that has ever existed is extinct; extinction is the rule, survival is the exception.”

Carl Sagan (1934–1996) American astrophysicist, cosmologist, author and science educator

The Varieties of Scientific Experience: A Personal View of the Search for God (2006)

“Only two suppositions seem to be open to us — Either each species of crocodile has been specially created, or it has arisen out of some pre-existing form by the operation of natural causes.
Choose your hypothesis; I have chosen mine. I can find no warranty for believing in the distinct creation of a score of successive species of crocodiles in the course of countless ages of time.”

Thomas Henry Huxley (1825–1895) English biologist and comparative anatomist

1860s, On a Piece of Chalk (1868)

“The evolution of consciousness, in its ethical import, means the extension in both space and time of the consciousness of similarity. Starting from individual egoism, consciousness has extended, vividly or vaguely, from individual self to family, and from family to clan, and from clan to tribe, and from tribe to nation, and from nation to race, and from race to species, and from species to kingdom. This amplification has gone on and is still going on in both space and time. Universal consciousness of similarity contemplates all the beings in space and all those to be in time.”

J. Howard Moore (1862–1916)

Source: Better-World Philosophy: A Sociological Synthesis (1899), Egoism and Altruism, pp. 120–121

“There exists a species of transcendental ventriloquism by means of which men can be made to believe that something said on earth comes from Heaven.”

Georg Christoph Lichtenberg (1742–1799) German scientist, satirist

F 84
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“When two sympatric, closely related species appear to have very similar needs, we may ask whether mechanisms exist that enable them to avoid direct competition. Implicit in this questions the presumption that two species with identical requirements cannot coexist”

Carl Safina (1955) American biologist

Gause 1934
[Foraging habitat partitioning in Roseate and Common Terns, The Auk, 107, 2, April 1990, 351–358, 10.2307/4087619, https://www.jstor.org/stable/4087619]

“There is but one hypothesis regarding the origin of species of animals in general which has any scientific existence—that propounded by Mr. Darwin.”

Thomas Henry Huxley (1825–1895) English biologist and comparative anatomist

Source: 1860s, Evidence as to Man's Place in Nature (1863), Ch.2, p. 125

“America’s most important ally should be humanity itself. Our species will not survive another 100 years if we don’t move from a competitive to a cooperative mode of existence. “Me first” is an obsolete, unsustainable perspective.”

Marianne Williamson (1952) American writer

Twitter https://twitter.com/marwilliamson (8 Jan 20) <br class="br">Williamson's quotes in social media

“Looking not to any one time, but to all time, if my theory be true, numberless intermediate varieties, linking most closely all the species of the same group together, must assuredly have existed; but the very process of natural selection constantly tends, as has been so often remarked, to exterminate the parent forms and the intermediate links. Consequently evidence of their former existence could be found only amongst fossil remains”

Charles Darwin book On the Origin of Species (1859)

. <br class="br">Source: On the Origin of Species (1859), chapter VI: "Difficulties on Theory", page 179 http://darwin-online.org.uk/content/frameset?pageseq=197&itemID=F373&viewtype=side

“I suggest that the psychophysical function that maps physical parameter space into a species' psychological space has been shaped over evolutionary history so that consequential regions for that species, although variously shaped, are not consistently elongated or flattened in particular directions.”

Roger Shepard (1929) American psychologist

Source: "Toward a universal law of generalization for psychological science," 1987, p. 1319

“Every species has come into existence coincident both in space and time with a pre-existing closely allied species.”

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Alfred Russel Wallace12

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