acritarchn.

Brit.

/ˈakrᵻtɑːk/, U.S.

/ˈækrəˌtɑrk/

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἄκριτος , -arch comb. form².

Etymology: < ancient Greek ἄκριτος undistinguishable, doubtful (see Acrita n.) + -arch comb. form².

Palaeontology.

Any hollow unicellular organic microfossil which is not otherwise categorized or classified.

ΘΚΠ

the world > life > biology > organism > fossil > [noun] > types of

astroite1610

belemnite1646

mussel-stone1660

scallop-stone1668

trochite1676

conchite1677

ophiomorphite1677

pectinite1677

worm-stone1677

musculite1681

serpent-stone1681

sugar-plum1681

glossopetraa1684

ague shell1708

forket1708

mytilite1727

grit1748

phytolithus1761

fairy beads1767

fairy fingers1780

fairy arrow1794

gryphite1794

ram's horn1797

hysterolite1799

tubulite1799

thunder-pick1801

celleporite1808

ceraunite1814

seraph1822

serpulite1828

coprolite1829

subfossil1831

pencil1843

trigonellite1845

buccinite1852

rudist1855

guide fossil1867

witch's cradle1867

coccolith1868

fairy cheeses1869

discolith1871

Portland screw1871

spiniferite1872

cyatholith1875

cryptozoon1883

sabellite1889

palaeospecies1895

homoeomorph1898

rudistid1900

megafossil1932

scolecodont1933

macrofossil1937

hystrichosphere1955

palynomorph1961

acritarch1963

molecular fossil1965

mitrate1967

1963 W. R. Evitt in Proc. National Acad. Sci. U.S.A. 49 300 Left behind by this transfer is a ‘residue’ of forms of unknown affinities for which the name Hystrichosphaerida is no longer appropriate. It is for this ‘residue’ that I propose the name acritarchs... The name chosen implies no affinity with any other organisms and is not derived from the name of any taxon included in the group.

1970 R. M. Black Elements Palaeontol. xix. 299 Acritarchs are included here along with algae since they most nearly resemble cysts or vegetative stages in the life cycle of certain algae.

1979 Nature 8 Feb. 464/2 The first cycle was governed by organic-walled plankton (acritarchs, green and blue-green algae), whereas the second cycle was dominated by calcareous nannoplankton.

2005 H. A. Armstrong & M. D. Brasier Microfossils (ed. 2) ix. 71/1 Ranging from mid-Precambrian to Recent times, acritarchs reached their acme in the Palaeozoic.

This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).

单词	acritarch
释义	acritarchn. Brit. /ˈakrᵻtɑːk/, U.S. /ˈækrəˌtɑrk/ Origin: A borrowing from Greek, combined with an English element. Etymons: Greek ἄκριτος , -arch comb. form². Etymology: < ancient Greek ἄκριτος undistinguishable, doubtful (see Acrita n.) + -arch comb. form². Palaeontology. Any hollow unicellular organic microfossil which is not otherwise categorized or classified. ΘΚΠ the world > life > biology > organism > fossil > [noun] > types of astroite1610 belemnite1646 mussel-stone1660 scallop-stone1668 trochite1676 conchite1677 ophiomorphite1677 pectinite1677 worm-stone1677 musculite1681 serpent-stone1681 sugar-plum1681 glossopetraa1684 ague shell1708 forket1708 mytilite1727 grit1748 phytolithus1761 fairy beads1767 fairy fingers1780 fairy arrow1794 gryphite1794 ram's horn1797 hysterolite1799 tubulite1799 thunder-pick1801 celleporite1808 ceraunite1814 seraph1822 serpulite1828 coprolite1829 subfossil1831 pencil1843 trigonellite1845 buccinite1852 rudist1855 guide fossil1867 witch's cradle1867 coccolith1868 fairy cheeses1869 discolith1871 Portland screw1871 spiniferite1872 cyatholith1875 cryptozoon1883 sabellite1889 palaeospecies1895 homoeomorph1898 rudistid1900 megafossil1932 scolecodont1933 macrofossil1937 hystrichosphere1955 palynomorph1961 acritarch1963 molecular fossil1965 mitrate1967 1963 W. R. Evitt in Proc. National Acad. Sci. U.S.A. 49 300 Left behind by this transfer is a ‘residue’ of forms of unknown affinities for which the name Hystrichosphaerida is no longer appropriate. It is for this ‘residue’ that I propose the name acritarchs... The name chosen implies no affinity with any other organisms and is not derived from the name of any taxon included in the group. 1970 R. M. Black Elements Palaeontol. xix. 299 Acritarchs are included here along with algae since they most nearly resemble cysts or vegetative stages in the life cycle of certain algae. 1979 Nature 8 Feb. 464/2 The first cycle was governed by organic-walled plankton (acritarchs, green and blue-green algae), whereas the second cycle was dominated by calcareous nannoplankton. 2005 H. A. Armstrong & M. D. Brasier Microfossils (ed. 2) ix. 71/1 Ranging from mid-Precambrian to Recent times, acritarchs reached their acme in the Palaeozoic. This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021). < n.1963
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