Genera

(n. pl.) See Genus.

(pl. ) of Genus

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• In this respect, therefore, the species of the larger genera resemble varieties, more than do the species of the smaller genera. 查尔斯·达尔文. 物种起源.
• In genera having more than the average number of species in any country, the species of these genera have more than the average number of varieties. 查尔斯·达尔文. 物种起源.
• Thus, as I believe, species are multiplied and genera are formed. 查尔斯·达尔文. 物种起源.
• The archipelago, though not rich in insects, afforded several new genera, each island with its distinct kinds. 李贝. 西洋科学史.
• On the lofty mountains of equatorial America a host of peculiar species belonging to European genera occur. 查尔斯·达尔文. 物种起源.
• Thus it is, as I believe, that two or more genera are produced by descent with modification, from two or more species of the same genus. 查尔斯·达尔文. 物种起源.
• The six descendants from (I) will form two sub-genera or genera. 查尔斯·达尔文. 物种起源.
• There are other relations between the species of large genera and their recorded varieties which deserve notice. 查尔斯·达尔文. 物种起源.
• If the plants inhabiting a country as described in any Flora, be divided into two equal masses, all those in the larger genera (i. 查尔斯·达尔文. 物种起源.
• Species belonging to different genera and classes have not changed at the same rate, or in the same degree. 查尔斯·达尔文. 物种起源.
• Altogether no less than ten genera are enumerated, which include species that imitate other butterflies. 查尔斯·达尔文. 物种起源.
• Fifteen new species of sea-fish were obtained, distributed in twelve genera. 李贝. 西洋科学史.
• On the Silla of Caraccas the illustrious Humboldt long ago found species belonging to genera characteristic of the Cordillera. 查尔斯·达尔文. 物种起源.
• But, by steps hereafter to be explained, the larger genera also tend to break up into smaller genera. 查尔斯·达尔文. 物种起源.
• We will suppose the letters A to L to represent allied genera existing during the Silurian epoch, and descended from some still earlier form. 查尔斯·达尔文. 物种起源.
• But so many causes tend to obscure this result, that I am surprised that my tables show even a small majority on the side of the larger genera. 查尔斯·达尔文. 物种起源.
• If the extreme forms in the genus happen to have been thus destroyed, the genus itself will stand more distinct from other allied genera. 查尔斯·达尔文. 物种起源.
• The species and even the genera of many large natural families are so closely allied together that it is difficult to distinguish not a few of them. 查尔斯·达尔文. 物种起源.
• Mr. Gould remarked to me long ago, that in those genera of birds which range over the world, many of the species have very wide ranges. 查尔斯·达尔文. 物种起源.
• In certain genera of star-fishes, the very combinations needed to show that the pedicellariae are only modified branching spines may be found. 查尔斯·达尔文. 物种起源.
• I see no reason to limit the process of modification, as now explained, to the formation of genera alone. 查尔斯·达尔文. 物种起源.
• Although many distinct genera within the same family have been grafted together, in other cases species of the same genus will not take on each other. 查尔斯·达尔文. 物种起源.
• We may instance Rubus, Rosa, and Hieracium among plants, several genera of insects, and of Brachiopod shells. 查尔斯·达尔文. 物种起源.
• We may suppose that the numbered letters in italics represent genera, and the dotted lines diverging from them the species in each genus. 查尔斯·达尔文. 物种起源.
• We have seen that in each country it is the species belonging to the larger genera which oftenest present varieties or incipient species. 查尔斯·达尔文. 物种起源.
• We shall also have two very distinct genera descended from (I), differing widely from the descendants of (A). 查尔斯·达尔文. 物种起源.
• Classes, genera, and species of animals appear and disappear, but the range widens. 赫伯特·乔治·威尔斯. 世界史纲.
• In some other genera they are present, but in a rudimentary condition. 查尔斯·达尔文. 物种起源.
• Those genera survive which give rise t o species adapted to new conditions of existence. 李贝. 西洋科学史.
• In most polymorphic genera some of the species have fixed and definite characters. 查尔斯·达尔文. 物种起源.

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