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Palaeobotanical Redux: Revisiting the Age of the Angiosperms Patrick S

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Palaeobotanical Redux: Revisiting the Age of the Angiosperms Patrick S REVIEW ARTICLE PUBLISHED: 3 MARCH 2017 | VOLUME: 3 | ARTICLE NUMBER: 17015 Palaeobotanical redux: revisiting the age of the angiosperms Patrick S. Herendeen1*, Else Marie Friis2, Kaj Raunsgaard Pedersen3 and Peter R. Crane4,5 Angiosperms (flowering plants) are the most diverse of all major lineages of land plants and the dominant autotrophs in most terrestrial ecosystems. Their evolutionary and ecological appearance is therefore of considerable interest and has significant implications for understanding patterns of diversification in other lineages, including insects and other animals. More than half a century ago, influential reviews showed that while angiosperms are richly represented in sediments of Late Cretaceous and younger ages, there are no reliable records of angiosperms from pre-Cretaceous rocks. The extensive new macrofossil, meso- fossil, and microfossil data that have accumulated since have confirmed and reinforced this pattern. Recently, however, molecu- lar dating methods have raised the possibility that angiosperms may have existed much earlier, and there have been scattered reports of putative angiosperms from Triassic and Jurassic rocks. Critical assessment of these reports shows that, so far, none provide unequivocal evidence of pre-Cretaceous angiosperms. Angiosperms may ultimately be recognized from Jurassic or ear- lier rocks, but credible palaeobotanical evidence will require unambiguous documentation of the diagnostic structural features that separate angiosperms from other groups of extant and extinct seed plants. ore than half a century ago, two pivotal reviews1,2 showed preserved as compressions or impressions from Early Cretaceous that while the fossil history of angiosperms “is extra­ strata11–13. Taken together, these discoveries and their sequence Mordinarily and increasingly well documented in post­Early of appearance in the fossil record are broadly consistent with the Cretaceous sediments…no bona fide angiosperm remains, either patterns of relation ships established among extant angiosperms megafossil or microfossil, have yet been described from rocks older using molecular data, and the associated patterns of character evo­ than Early Cretaceous”1. Here, we revisit this conclusion and assess lution. All of the reproductive structures recognized so far from the extent to which the situation has changed, given a substantial Early Cretaceous sediments are either extinct forms, apparently increase in the quantity and quality of palaeobotanical data and an with no close relatives among living angiosperms, or are related to increasing number of reports of angiosperms from older rocks. Austrobaileyales, Chloranthales, Nymphaeales, various groups of Since the key reviews of the 1960s, great progress has been eumagnoliids, or early branches of eudicots or monocots (Fig. 1, for made in understanding the major patterns in the angiosperm fossil references see refs 10 and 14). Preservation of fine structural details record3–5. There have also been significant advances in understand­ in some of these Early Cretaceous fossils further confirms their ing evolutionary relationships within the angiosperm clade—espe­ inferred relation ship with extant lineages that are hypothesized to cially in using DNA sequences from living plants to reconstruct have diverged at an early stage in angiosperm diversification based phylogenetic patterns6. Widely accepted hypotheses indicate on molecular phylogenetics15. that more than 99% of angiosperm species occur in three major The improved angiosperm fossil record from the Cretaceous clades (eudicots, monocots, (eu)magnoliids), which are embed­ has facilitated the calibration of molecular clock age estimates ded in a paraphyletic assemblage of other early diverging lineages for various angiosperm clades and for the age of angiosperms as that includes Amborellales, Austrobaileyales, Ceratophyllales, a whole16–21. While current techniques remain susceptible to prob­ Chloranthales and Nymphaeales6–8. More controversial are esti­ lems resulting from significantly different rates of molecular evo­ mates of the age of the most recent common ancestor of extant lution and levels of diversification among different angiosperm angiosperms based on molecular clock techniques, and hypotheses clades, as well as taxon­sampling strategies18,20, results from some of the phylogenetic position of angiosperms in relation to other such studies suggest ages for the angiosperm crown group that are seed plant lineages. As molecular clock estimates are most often considerably older than those indicated by most assessments of the calibrated using palaeontological data, and because the closest rela­ palaeobotanical record21–24. This provides a context in which claims tives to angiosperms are almost certainly extinct groups, fossils are of pre­Cretaceous angiosperms take on particular importance. integral to progress in both of these areas. It is also significant that even though phylogenetic relationships Building on important advances made during the 1970s3,4,9, among angiosperms and other seed plants remain uncertain, the recent decades have seen an explosion of new systematically other four groups of living seed plants (cycads, conifers, Ginkgo, informative data on early angiosperms, including discoveries of Gnetales), as well as potentially relevant extinct clades (for exam­ abundant three­dimensionally preserved flowers and other repro­ ple, Bennettitales, Caytoniales, Corystospermales), have fossil his­ ductive structures in the Early and Late Cretaceous (see refer­ tories that extend back to the Triassic or earlier. This implies that ences in ref. 10). There have also been important reports of flowers the angiosperm stem­lineage had diverged from those of other seed 1Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, Illinois 60022, USA. 2Department of Palaeobiology, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden. 3Department of Earth Science, University of Aarhus, DK-8000 Aarhus, Denmark. 4Oak Spring Garden Foundation, 1776 Loughborough Lane, Upperville, Virginia 20184, USA. 5Yale School of Forestry and Environmental Studies, 195 Prospect Street, New Haven, Connecticut 06511, USA. *e-mail: [email protected] NATURE PLANTS 3, 17015 (2017) | DOI: 10.1038/nplants.2017.15 | www.nature.com/natureplants 1 ©2017 Mac millan Publishers Li mited, part of Spri nger Nature. All ri ghts reserved. REVIEW ARTICLE NATURE PLANTS plants by at least the Late Triassic, or perhaps earlier. It is therefore Recognizing early angiosperms in the fossil record possible that crown­group angiosperms existed before the Early The ability to infer the presence of the angiosperm crown group Cretaceous and it is likely that some seed plants from the Triassic from incomplete fossil evidence is fundamental to discussions of and Jurassic possessed some, but not all, of the features of crown­ the age of angiosperms as the fossil record mainly comprises only group angiosperms, defined as the most recent common ancestors fragments of extinct plants. Only some of the key features (synapo­ of all living angiosperms and its derivatives25,26. morphies)10,27 that are restricted to the angiosperm crown group 0 Angiosperm radiation continues through the Neogene to the Holocene 23.0 Chattian Eudicots Oligocene Rupelian Priabonian Rosids Asterids Bartonian “Basal” eudicots Chloranthoids Eumagnoliids Lutetian Monocots Paleogene Eocene ANA Other asterids Ypresian Other rosids Ericales Fagales Thanetian Selandian Paleocene Danian 65.5 Maastrichtian Campanian Late Santonian Coniacian Turonian Cenomanian 99.6 Albian 112.0 Cretaceous Aptian Early 125.0 Barremian 130.0 Hauterivian Valanginian Berriasian 145.5 Tithonian Late Kimmeridgian Oxfordian 161.2 Callovian Bathonian Middle Bajocian Many claims of angiosperm macrofossils from the Jurassic, Aalenian but so far none withstands close scrutiny. Jurassic Toarcian Early Pliensbachian Sinemurian Hettangian 199.6 Rhaetian Norian Late Carnian Angiosperm-like pollen grains with reticulate pollen 228.0 walls recorded from the Middle and Late Triassic, Ladinian but so far their botanical anity remains uncertain. Triassic Middle Anisian 245.0 Early Olenekian Induan 251.0 Figure 1 | Fossil ranges of major angiosperm lineages, focused on the Cretaceous diversification. The fossil record of plant micro-, meso- and macrofossils shows that the first major radiation of angiosperms took place in the Early Cretaceous. Fossil flowers recognized so far from the Early Cretaceous are either extinct forms, apparently with no close relatives among living angiosperms, or are related to Austrobaileyales, Chloranthales, Nymphaeales, various groups of eumagnoliids, or early branches of eudicots or monocots. Floral diagrams of Early Cretaceous angiosperms from left to right: ANA: Monetianthus (Nymphaeales); chloranthoids: Canrightia and Canrightiopsis; eumagnoliids: Virginianthus, Powhatania and Potomacanthus (Laurales); basal eudicots: Kajanthus (Ranunculales) and Kenilanthus (uncertain position). Floral diagrams of mid-Cretaceous angiosperms from left to right: chloranthoid: unnamed Chloranthistemon-like flower; eumagnoliids: Archaeanthus (Magnoliales) and Mauldinia (Laurales); basal eudicots: Spanomera (Buxales) and Friisicarpus (Proteales); rosids: Caliciflora and unnamed Rose Creek rosid (precise placement among Pentapentalae uncertain). Floral diagrams of Late Cretaceous angiosperms from left to right: chloranthoids: Chloranthistemon; eumagnoliids: Futabanthus (Magnoliales), Neusenia
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