“The principle being accepted that all Species of one Genus have arisen from one mother through different fathers, it must be assumed
# That in the beginning the Creator created of each natural Order only one plant with reproductive power.
# That by their various mixings different plants have arisen which belong to the mother's natural order as they are similar to the mother with regard to their fructifications, and are, as it were, species of the order, i. e., genera.
# We may assume that plants have arisen within the orders, i. e. by genera of one order, may mix with each other. In this was there will arise species that should be referred to the mother's genus as her daughters.”

Praelectiones (Lectures, 1744) quoted in Larson (1967:317)

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Carl Linnaeus23

Swedish botanist, physician, and zoologist 1707–1778

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“We imagine that the Creator at the actual time of creation made only one single species for each natural order of plants, this species being different in habit and fructification from all the rest. That he made these mutually fertile, whence out of their progeny, fructification having been somewhat changed, Genera of natural classes have arisen as many in number as the different parents, and since this is not carried further, we regard this also as having been done by His Omnipotent hand directly in the beginning; thus all Genera were primeval and constituted a single Species. That as many Genera having arisen as there were individuals in the beginning, these plants in course of time became fertilised by others of different sort and thus arose Species until so many were produced as now exist… these Species were sometimes fertilised out of congeners, that is other Species of the same Genus, whence have arisen Varieties.”

Carl Linnaeus (1707–1778) Swedish botanist, physician, and zoologist

Fundamenta fructificationis (1742). As quoted in John S. Wilkins (2009), "Species: A History of the Idea," University of California Press. p. 72

“We say there are as many genera as there are similarly constituted fructifications of different natural species.”

Carl Linnaeus book Fundamenta Botanica

Fundamenta Botanica (1736).
Original in Latin: Genera tot dicimus, quot similes constructae fructifications proserunt diversae Species naturales

“If species had really arisen by the natural selection for impalpable differences, intermediate forms should abound, and the limits between species should be on the whole indefinite. As this conclusion follows necessarily from the premisses, the selectionists believe and declare that it represents the facts of nature. Difference between species being by axiom indefinite, the differences between varieties must be supposed to be still less definite. Consequently the conclusion that evolution must proceed by insensible transformation of masses of individuals has become an established dogma.”

William Bateson (1861–1926) British geneticist and biologist

Source: Mendel's Principles of Heredity (1913), p. 3

“It [variation and natural selection] would explain, says Mr. Darwin, the unity of type which runs through the whole organic world, and why there is sometimes a fundamental agreement in structure in the same class of beings which is quite independent of their habits of life, for such structure, derived by inheritance from a remote progenitor, has been modified, in the course of ages, in different ways, according to the conditions of existence. It would also explain why all living and extinct beings are united, by complex radiating and circuitous lines of affinity with one another, into one grand system; also, there having been a continued extinction of old races and species in progress, and a formation of new ones by variation, why in some genera which are largely represented, or to which a great many species belong, many of these are closely but unequally related; also, why there are distinct geographical provinces of species of animals and plants, for, after long isolation by physical barriers, each fauna and flora, by varying continually, must become distinct from its ancestral type, and from the new forms assumed by other descendants which have diverged from the same stock.”

Charles Lyell (1797–1875) British lawyer and geologist

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.21, p. 413

“This opinion… appears to be ancient… that the one, excess and defect, are the principles of things… It is not… probable that there are more than three principles… [E]ssence is one certain genus of being: so that principles will differ from each other in prior and posterior alone, but not in genus, for in one genus there is always one contrariety, and all contrarieties appear to be referred to one. That there is neither one element, therefore, nor more than two or three, is evident.”

Aristotle book Physics

Book I, Ch. VII, pp. 62-63.
Physics

“When one reads about Tyrannosaurus and Brontosaurus, one is not dealing with species, like lions or African elephants. Instead, these are genera, a group of animal species. For example, the lion is in the genus Panthera.”

Gregory Scott Paul (1954) U.S. researcher, author, paleontologist, and illustrator

Species of Panthera include the lion Panthera leo, the tiger P. tigris, and the leopard P. pardus, among others. So saying Tyrannosaurus is much like saying "the big cats".
Gregory S. Paul (1988) Predatory Dinosaurs of the World, Simon and Schuster, p. 176
Predatory Dinosaurs of the World