metagenesisn.
/ˌmɛtəˈdʒɛnᵻsɪs/, U.S. /ˌmɛdəˈdʒɛnəsəs/ 1. Zoology. Alternation of generations; spec. alternation of asexual and sexual forms.
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the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [noun] > alternate generation
alternate generation1841
alternation of generations1845
metagenesis1849
heterogenesis1863
heterogamy1884
heterogeny1886
heterogony1906
1849 R. Owen Parthenogenesis 22 The ova are impregnated, and develope the monadiform embryo; this gives origin to the beroiform Pluteus, which produces by ‘metagenesis’ rather than by metamorphosis, the young Echinus.
1859 Todd's Cycl. Anat. & Physiol. V. 13/1 This is the ‘Alternating Generation’ of Steenstrup, or what we might with Mr. Owen call, in contrast to Metamorphosis, a process of Metagenesis.
1886 G. Rolleston & W. H. Jackson Anim. Life 31 Alternation of Generations..whether in the form known as metagenesis, i.e. the alternation of asexual and sexual individuals, or as heterogamy, i.e. the alternation of parthenogenetic and sexual races.
1942 Ecology 23 295/1 Polymorphism embraces such phenomena as alternation of generations or metagenesis, sexual dimorphism,..and the social polymorphism of ants, bees, wasps and termites.
1960 D. C. Braungart & R. Buddeke Introd. Animal Biol. (ed. 5) 378 Coelenterata... Gastrovascular cavity with mouth but no anus. Metagenesis in some species.
1996 Internat. Jrnl. Developmental Biol. 40 331 (title) Checkpoints in the life-cycle of Cassiopea spp.: control of metagenesis and metamorphosis in a tropical jelly fish.
2. Geology. A stage in the alteration of sedimentary rocks occurring between (or incorporating) the late stages of catagenesis and the beginning of metamorphism. Cf. catagenesis n., diagenesis n.
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1958 A. G. Kossovskaya & V. D. Shutov in Eclogae Geologicae Helvetiae 51 664 The next two zones correspond to the stage of early metamorphism or metagenesis by stress operating jointly with a vertical overburden and increasing temperature.
1966 Doklady Earth Sci. 168 170/1 The two upper zones mark the zones of initial and deep epigenesis, while the third corresponds to the zone of early metagenesis.
1972 Gloss. Geol. (Amer. Geol. Inst.) 445/1 Metagenesis, a term applied by Russian geologists to epigenesis..or to late epigenesis.
1980 Moscow Univ. Geol. Bull. 35 12 Sedimentary deposits of geosyncline areas undergo..secondary changes which correspond to different stages of catagenesis..and..subsequent metagenesis or early metamorphism.
1999 R. J. Merriman & M. Frey in M. Frey & D. Robinson Low-grade Metamorphism iii. 69/1 Only dry gas, mostly methane, is produced in the stage of metagenesis.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2022).
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