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Fossil Legume Woods of the Prioria-Clade

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Fossil Legume Woods of the Prioria-Clade Review of Palaeobotany and Palynology 246 (2017) 44–61 Contents lists available at ScienceDirect Review of Palaeobotany and Palynology journal homepage: www.elsevier.com/locate/revpalbo Fossil legume woods of the Prioria-clade (subfamily Detarioideae) from the lower Miocene (early to mid-Burdigalian) part of the Cucaracha Formation of Panama (Central America) and their systematic and palaeoecological implications Oris Rodríguez-Reyes a,b,d,⁎, Peter Gasson c,HowardJ.Falcon-Langd, Margaret E. Collinson d a Smithsonian Tropical Research Institute, Box 0843-03092, Balboa, Ancon, Panama b Departamento de Botánica, Universidad de Panamá, Panama c Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey TW9 3DS, UK d Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK article info abstract Article history: Three fossil wood specimens are described from the Miocene (early to mid-Burdigalian) part of the Cucaracha Received 26 August 2016 Formation of Panama, Central America. The calcareously-permineralised fossils, which contain Teredolites bor- Received in revised form 9 June 2017 ings, occur in erosive-based pebbly conglomerate lenses, interpreted as tidally-influenced fluvial channel de- Accepted 15 June 2017 posits. Detailed investigation of fossil wood anatomy reveals features characteristic of the Prioria-clade, a Available online 19 June 2017 supergenus of the legume subfamily, Detarioideae. Based on quantitative comparison with extant material in the micromorphology slide collection at the Royal Botanic Gardens, Kew, the fossil material is referred to two Keywords: South America new species, Prioria hodgesii sp. nov. and Prioria canalensis sp. nov. Facies data imply that these new taxa may Panama isthmus have occupied a similar ecological niche to the extant Prioria copaifera, a saline-tolerant tropical genus that Inside Wood forms wetland gallery forests along tidal estuaries in Panama today. Findings contribute to the understanding Legume of the palaeoecology of this early-diverging subfamily within the basal Leguminosae. They, also, further extend Prioria knowledge of the coastal forests along the leading edge of North America during its Miocene convergence with South America. © 2016 Elsevier B.V. All rights reserved. 1. Introduction Detarioideae (84 genera) and a more derived and diverse clade com- prises Duparquetioideae (1 genus), Dialioideae (17 genera), Leguminosae (colloquially referred to as legumes; also validly Caesalpinioideae (148 genera) and Papilionoideae (503 genera). This known as Fabaceae) is the third most speciose family of flowering interpretation differs from the traditional view of a basal paraphyletic plants after the orchids (Orchidaceae) and daisies (Asteraceae/ caesalpinioid-grade from which arise the derived ‘Mimosoideae’ and Compositae) with ~765 genera and ~19,328 species (Sprent, 2001; ‘Papilionoideae’ clades (Lewis et al., 2005). Lewis et al., 2005; LPWG, 2017). Molecular evidence points to an In this paper, we describe new fossil woods from lower Miocene early Paleogene (~60 Ma) (Sprent, 2007) origin, with the oldest strata of Panama, Central America that may be confidently referred to well-accepted fossils of Eocene age (~52 Ma; Herendeen et al., the Leguminosae. While some legume genera show very distinctive 1992); the family now constitutes a major ecological component of wood anatomy (e.g., Robinia and Dalbergia in the Papilionoideae; the Earth's vegetation, including many taxa of economic importance Wheeler and Baas, 1992), others show a very generalised structure (LPWG, 2017). with many intergrading features (e.g., Lonchocarpus and Millettia, Based on comprehensive analyses of plastid matK gene sequences, a also in the Papilionoideae; Baretta-Kuipers, 1981; Gasson et al., new phylogeny has revealed six subfamilies in two clades (LPWG, 2004). As a result, the attribution of isolated fossil wood types to 2017): a basal clade comprises Cercidoideae (12 genera) and the Leguminosae family can be very challenging indeed (Wheeler and Manchester, 2002). Nonetheless, the following constellation of features seen in our material is generally characteristic of legumes: ⁎ Corresponding author at: Smithsonian Tropical Research Institute, Box 0843-03092, – Balboa, Ancon, Panama. simple perforation plates, alternate intervessel pitting, vessel ray E-mail address: [email protected] (O. Rodríguez-Reyes). pits similar to intervessel pits in size and shape, fibres with simple http://dx.doi.org/10.1016/j.revpalbo.2017.06.005 0034-6667/© 2016 Elsevier B.V. All rights reserved. O. Rodríguez-Reyes et al. / Review of Palaeobotany and Palynology 246 (2017) 44–61 45 pits, vestured pits present (with some exceptions) and paratracheal understanding of the evolution of the subfamily, and findings also axial parenchyma with mostly 2–4 cells per strand (Baretta-Kuipers, add to the wealth of new systematic and biogeographical knowledge 1981; Herendeen, 2000; Gasson et al., 2003). about the Miocene forests of Central America, prior to the formation The fossils reported here are of especial interest, however, and uplift of the Isthmus of Panama. because not only do they bear close comparison with legumes in general, but also they may be confidently referred to the early-di- verging Detarioideae clade, which is sister to almost all other 2. Geological context Leguminosae (LPWG, 2017) and mostly comprises large pan-tropical rainforest trees, distributed through Africa, Asia and South America The fossil wood specimens, reported here, were collected from (Herendeen et al., 2003). This group underwent initial diversifica- Hodges Hill on the Gaillard Cut of the Panama Canal (Fig. 1), c. 25 km tion in Eocene times (De Franceschi and De Ploëg, 2003), with a sec- west of Panama City (Latitude 09°02′51.75″N; Longitude 79°39′14.02″ ondary diversification event commencing in early Miocene times W). Fossil woods are abundant at this important fossil locality, and com- (De la Estrella et al., 2017). The earliest fossil records of the prise calcareously-permineralised trunks, 0.31–3.0 m long and typically Detarioideae are probably Sindora-like pollen grains from the Eocene 0.25–0.80 m in diameter, commonly with Teredolites borings. The al- of North America (Muller, 1981, 1984); however, the oldest known lochthonous assemblage is preserved within a pebbly sandstone bed, fossils in Central America occur near the Oligocene–Miocene bound- interpreted as the deposits of a tidally-influenced fluvial channel ary (Hueber and Langenheim, 1986; Poinar and Poinar, 1999; Poinar (Rodríguez-Reyes et al., 2014). The bed containing the fossil wood as- and Chambers, 2015). The Detarioideae subfamily is particularly im- semblage is positioned ~20 m above the base of the Cucaracha Forma- portant because it is the subject of intense anatomical and molecular tion, that has been dated as early Miocene (early to mid-Burdigalian) investigation, for the information it might provide about the evolu- age (MacFadden et al., 2014). A welded silicic tuff (known as the tion and systematics of the Leguminosae family (Redden et al., “Cucaracha Tuff”), positioned stratigraphically ~50 m above the fossil 2010; LPWG, 2017). Our new fossils therefore contribute to the wood layer, has a U–Pb age of 18.81 ± 0.30 Ma and Ar/Ar age of 18.96 Fig. 1. Location details for the fossil site. 1., Panama in Central America. 2., The Panama Canal Zone showing the location of the Hodges Hill locality. Taken from Rodríguez-Reyes et al. (2014). 46 O. Rodríguez-Reyes et al. / Review of Palaeobotany and Palynology 246 (2017) 44–61 ±0.90Ma(MacFadden et al., 2014; Farris et al., 2017), providing a min- Archaeology, Smithsonian Tropical Research Institute, Panama. imum age for the fossil assemblage reported here (Fig. 2). Petrographic thin sections were prepared for each specimen in Trans- verse Section (TS), Radial Longitudinal Section (RLS) and Tangential 3. Materials and methods Longitudinal Section (TLS) in the Department of Earth Sciences, Royal Holloway University of London. Oriented fossil slices were mounted μ This paper builds on earlier descriptions of fossil wood from the on glass slides using EpoFix resin, ground to a thickness of ~30 m, fi Cucaracha Formation of Panama, including representatives of and cover slips were af xed with Canada balsam. Material was observed Malvaceae (Rodríguez-Reyes et al., 2014) and Malpighiales and imaged using an Olympus binocular BH-5 microscope with a Nikon (Rodríguez-Reyes et al., 2017) among a rich and diverse wood flora digital camera system and software. Modern woods in the Jodrell Labo- that also includes families such as Sapotaceae, Arecaceae, ?Meliaceae, ratory of the Royal Botanic Gardens, Kew, U.K. (RBGK) were also studied and other different types assigned to Malvaceae and Leguminosae for comparative purposes, and imaged using a Leica DM LB microscope (Rodríguez-Reyes, 2014). Anatomical preservation of fossil wood is gen- with Zeiss Axiocam HRc camera attachment and Zeiss Axiovision erally good, allowing for detailed description and comparison with mi- software. croscope slides of extant woods in reference collections (Fig. 2). 3.2. IAWA feature description 3.1. Accession data, specimen preparation, and imaging Specimens were described using the International Association of The three new fossil wood specimens, reported here, collected in Wood Anatomists (IAWA) List of Features for Hardwood Identification 2011 and 2013, are accessioned as STRI 14165, STRI 36273, and STRI (IAWA Committee, 1989).
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