stasigenesisn.

1957 J. 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.

1958 Nature 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’.

1965 Evolution 19 255/1 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.

1980 Current Topics in Cellular Regulation 16 147 Stasigenesis appears to impose on life evolutionary homeostasis, or stability in confining variation within limits of general patterns.

1989 Canad. Jrnl. Bot. 67 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.

1965 Evolution 19 255/1 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.