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Paisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal

2018Journal article Open access
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dc.contributor.authorFriis, Else Marie
dc.contributor.authorMENDES, MÁRIO
dc.contributor.authorPedersen, Kaj Raunsgaard
dc.date.accessioned2018-12-07T14:58:21Z
dc.date.available2018-12-07T14:58:21Z
dc.date.issued2018
dc.description.abstractA new fossil angiosperm, Paisia pantoporata, is described from the Early Cretaceous Catefica mesofossil flora, Portugal, based on coalified floral buds, flowers and isolated floral structures. The flowers are actinomorphic and structurally bisexual with a single whorl of five fleshy tepals, a single whorl of five stamens and a single whorl of five carpels. Tepals, stamens and carpels are opposite, arranged on the same radii and tepals are involute at the base clasping the stamens. Stamens have a massive filament that grades without a joint into the anther. The anthers are dithecate and tetrasporangiate with extensive connective tissue between the tiny pollen sacs. Pollen grains are pantoporate and spiny. The carpels are free, apparently plicate, with many ovules borne in two rows along the ventral margins. Paisia pantoporata is the oldest known flower with pantoporate pollen. Similar pantoporate pollen was also recognised in the associated dispersed palynoflora. Paisia is interpreted as a possibly insect pollinated, herbaceous plant with low pollen production and low dispersal potential of the pollen. The systematic position of Paisia is uncertain and Paisia pantoporata most likely belongs to an extinct lineage. Pantoporate pollen occurs scattered among all major groups of angiosperms and a close match to the fossils has not been identified. The pentamerous floral organisation together with structure of stamen, pollen and carpel suggests a phylogenetic position close to the early diverging eudicot lineages, probably in the Ranunculales.
dc.description.sponsorshipSwiss Light Source at the Paul Scherrer Institute (European Union FP6 projects) [20130185, 20141047]; Swedish Research Council [2014-5228]; Portuguese Science Foundation (FCT) [UID/MAR/00350/2013]; CretaCarbo project [PTDC/CTE-GIX/113983/2009]
dc.identifier.doihttps://doi.org/10.1080/00173134.2017.1310292
dc.identifier.issn0017-3134
dc.identifier.urihttp://hdl.handle.net/10400.1/11975
dc.language.isoeng
dc.peerreviewedyes
dc.publisherTaylor & Francis
dc.subjectReproductive structures
dc.subjectYixian formation
dc.subjectNorth-America
dc.subjectMorphology
dc.subjectRanunculaceae
dc.subjectFossil
dc.subjectDiversity
dc.subjectEvolution
dc.subjectFruits
dc.subjectChina
dc.titlePaisia, an Early Cretaceous eudicot angiosperm flower with pantoporate pollen from Portugal
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage15
oaire.citation.issue01-fev
oaire.citation.startPage1
oaire.citation.titleGrana
oaire.citation.volume57
person.familyNameFriis
person.familyNameMENDES
person.familyNamePedersen
person.givenNameElse Marie
person.givenNameMÁRIO
person.givenNameKaj Raunsgaard
person.identifier.ciencia-id271D-9765-FA24
person.identifier.orcid0000-0001-7587-9687
person.identifier.orcid0000-0002-5470-5634
person.identifier.orcid0000-0003-3038-0967
person.identifier.scopus-author-id7005299278
person.identifier.scopus-author-id7102005524
rcaap.rightsopenAccess
rcaap.typearticle
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relation.isAuthorOfPublicationaef1c67d-c166-493e-9f10-0d4fceb8e7cb
relation.isAuthorOfPublication92901ba5-8e5b-49bc-914d-2b149abc76f8
relation.isAuthorOfPublication.latestForDiscoveryaef1c67d-c166-493e-9f10-0d4fceb8e7cb

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