Shi et al.—Silicified Paleoproterozoic microbiota from China


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Figure 12. Xiaohongyuia sinica Shi and Feng n. gen. n. sp.: (1) 2007XHYD_4_7; (2) 2007XHYD_4_10; (3) 2007XHYD_4_8; (4) 2007XHYD_4_21; (5) 2007XHYD_4_23; (6) 2007XHYD_4_14a; (7) 2007XHYD_4_14; (8) 2007XHYD_4_21; (9) holotype 2007XHYD_4_14; (10) 2007XHYD_4_17; (11) 2007XHYD_4_17; (12) 2007XHYD_4_10. All scale bars = 30 μm.


Significance of the new Dahongyu microbiota


On the basis of expanded documentation of complex fossils, the transitional time from Paleoproterozoic to Mesoproterozoic has already been proven as a significant era for eukaryotic evolution.


Previous research suggested that main clades of green algae separated in the late Paleoproterozoic and early Mesoproterozoic (Teyssèdre, 2006; Moczydłowska et al., 2011). During this era, several eukaryote-bearing strata were studied, such as the 1650 Ma McArthur Group from Australia, the 1500 Ma Kotuikan


Figure 11. Allochthonous forms: (1–5) Leioarachnitum sp.: (1) 2012XHYD_3_16; (2) 2012XHYD_3_14; (3) 2007XHYD_3_11; (4) 2012XHYD_14_20; (5) 2012XHYD_25_14; (6, 7) Leiosphaeridia minutissima: 2012XHYD_7_25; (8) Unnamed Form 1 spherical microfossil with broken, neck-like extension: 2007XHYD_2_3a; (9) Unnamed Form 2 rough-surfaced dyad spherical microfossil: 2007XHYD_2_1; (10) Unnamed Form 3 inequable dyad spherical microfossils: 2012XHYD_14_1a; (11) Unnamed Form 4 dividing cells: 2007XHYD_2_1; (12) Unnamed Form 5 spherical microfossil with a spine-like structure: 2007XHYD_3_22; (13) Unnamed Form 6 vase-shaped microfossil?: 2012XHYD_6_4; (14, 15) Unnamed Form 7, probable acanthomorphic acritarch: 2007XHYD_4_24. All scale bars = 30 μm.


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