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The fossil Osmundales (Royal Ferns)—a phylogenetic network analysis, revised taxonomy, and evolutionary classification of anatomically preserved trunks and rhizomes
Naturhistoriska riksmuseet, Enheten för paleobiologi. Westfälische Wilhelms-Universität Münster.ORCID-id: 0000-0002-2186-4970
Department fu¨r Pala¨ontologie, Universita¨t Wien, Wien, Austria.ORCID-id: 0000-0003-0674-3553
Naturhistoriska riksmuseet, Enheten för paleobiologi.ORCID-id: 0000-0001-6723-239X
2017 (Engelska)Ingår i: PeerJ, ISSN 2167-8359, E-ISSN 2167-8359, Vol. 5, artikel-id e3433Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The Osmundales (Royal Fern order) originated in the late Paleozoic and is the most ancient surviving lineage of leptosporangiate ferns. In contrast to its low diversity today (less than 20 species in six genera), it has the richest fossil record of any extant group of ferns. The structurally preserved trunks and rhizomes alone are referable to more than 100 fossil species that are classified in up to 20 genera, four subfamilies, and two families. This diverse fossil record constitutes an exceptional source of information on the evolutionary history of the group from the Permian to the present. However, inconsistent terminology, varying formats of description, and the general lack of a uniform taxonomic concept renders this wealth of information poorly accessible. To this end, we provide a comprehensive review of the diversity of structural features of osmundalean axes under a standardized, descriptive terminology. A novel morphological character matrix with 45 anatomical characters scored for 15 extant species and for 114 fossil operational units (species or specimens) is analysed using networks in order to establish systematic relationships among fossil and extant Osmundales rooted in axis anatomy. The results lead us to propose an evolutionary classification for fossil Osmundales and a revised, standardized taxonomy for all taxa down to the rank of (sub)genus. We introduce several nomenclatural novelties: (1) a new subfamily Itopsidemoideae (Guaireaceae) is established to contain Itopsidema, Donwelliacaulis, and Tiania; (2) the thamnopteroid genera Zalesskya, Iegosigopteris, and Petcheropteris are all considered synonymous with Thamnopteris; (3) 12 species of Millerocaulis and Ashicaulis are assigned to modern genera (tribe Osmundeae); (4) the hitherto enigmatic Aurealcaulis is identified as an extinct subgenus of Plenasium; and (5) the poorly known Osmundites tuhajkulensis is assigned to Millerocaulis. In addition, we consider Millerocaulis stipabonettiorum a possible member of Palaeosmunda and Millerocaulis estipularis as probably constituting the earliest representative of the (Todea-)Leptopteris lineage (subtribe Todeinae) of modern Osmundoideae.

Ort, förlag, år, upplaga, sidor
Washington DC: Peer J Inc. , 2017. Vol. 5, artikel-id e3433
Nyckelord [en]
Evolutionary classification, Osmundaceae, Phylogeny, Filicopsida, Leptosporangiatae, Network analysis, Taxonomy, Anatomy, Ferns, Guaireaceae
Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Forskningsämne
Ekosystem och arthistoria
Identifikatorer
URN: urn:nbn:se:nrm:diva-2565DOI: 10.7717/peerj.3433PubMedID: 28713650OAI: oai:DiVA.org:nrm-2565DiVA, id: diva2:1162318
Forskningsfinansiär
Vetenskapsrådet, 2014–5234, 2014–5232Tillgänglig från: 2017-12-01 Skapad: 2017-12-04Bibliografiskt granskad

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Bomfleur, BenjaminGrimm, GuidoMcLoughlin, Stephen
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