| 释义 |
stasigenesis, n. Biol.|stæsɪˈdʒɛnɪsɪs|
[f. Gr. στάσις stasis n. + genesis n.: cf. anagenesis, catagenesis, cladogenesis ns.]
A stable phase of evolution, characterized by a lack of significant change over a long period of time.
1957J. S. Huxley in Nature 7 Sept. 454/1, I therefore propose the term stasigenesis to cover all processes leading to stabilization and persistence of types and of patterns of organization, from species up to phyla. 1958Nature 25 Jan. 289/2 This new formation of families started in the Pliocene, the period that represented the climax of fissipede evolution, after which it started on its stable phase of ‘stasigenesis’. 1965Evolution XIX. 255/1 It is not demonstrated or probable that anagenesis outweighs cladogenesis just in the Miocene to early Pliocene. The data do not really indicate that stasigenesis set in from Pliocene to Recent. 1980Current Topics in Cellular Regulation XVI. 147 Stasigenesis appears to impose on life evolutionary homeostasis, or stability in confining variation within limits of general patterns. 1989Canad. Jrnl. Bot. LXVII. 2937 The fossil record suggests stasigenesis in the evolutionary history of some members of the genus Equisetum since the beginning of the Tertiary, and perhaps longer.
Hence ˌstasigeˈnetic a., characterized by stasigenesis.
1965Evolution XIX. 255/1 The slope both for ‘basal families’ and for the whole suborder is slightly steeper in the phase considered stasigenetic than in the phase considered cladogenetic. |