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From the Lower Devonian Rhynie Chert

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From the Lower Devonian Rhynie Chert Acta Palaeobotanica 54(2): 163–171, 2014 DOI: 10.2478/acpa-2014-0010 Microfossils with suggested affinities to the Pyramimonadales (Pyramimonadophyceae, Chlorophyta) from the Lower Devonian Rhynie chert EVELYN KUSTATSCHER1,2, NORA DOTZLER2, THOMAS N. TAYLOR3 and MICHAEL KRINGS2,3 1 Naturmuseum Bozen, Bindergasse 1, 39100 Bolzano/Bozen, Italy; e-mail: [email protected] 2 Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig-Maximilians- Universität, and Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner-Straße 10, 80333 Munich, Germany; e-mail: [email protected]; [email protected] 3 Department of Ecology and Evolutionary Biology, and Natural History Museum and Biodiversity Research Institute, University of Kansas, Lawrence, KS 66045-7534, U.S.A.; e-mail: [email protected] Received 18 July 2014; accepted for publication 28 October 2014 ABSTRACT. An assemblage of unusual microfossils occurs within an accumulation of plant debris, hyphae, and various types of propagules in the Early Devonian Rhynie chert. Specimens consist of a vesicle with one or more prominent wings (alae) arising from the surface; one wing forms a rim around the equator of the vesicle. The microfossils are interpreted as phycomata of a prasinophycean green alga based on morphological similarities to Pterospermella, a microfossil similar to phycoma stages of the extant Pterosperma (Pyramimonadales). This report represents the third record of phycomata in the Rhynie chert, suggesting that this Early Devonian eco- system served as habitat to a variety of prasinophyte algae. Moreover, the new microfossils add to the inventory of fossil freshwater representatives of this predominantly marine group of algae. KEYWORDS: green algae, non-motile stage, phycoma, Pterosperma, Pterospermella, prasinophytes INTRODUCTION The Early Devonian Rhynie chert is one of To date, documented evidence of micro- a few geological sites where preservation of scopic algae from the Rhynie chert is compara- fossils is so extraordinary that even certain tively rare; only two forms have been formally organisms not typically reported in the fossil described (Edwards & Lyon 1983). This is record, as well as various types of interactions somewhat perplexing since the Rhynie paleo- between organisms, are faithfully preserved ecosystem must have provided ample habi- (e.g. Kerp & Hass 2004). Among the life forms tats for these organisms, and also represented documented in the Rhynie chert are various a depositional environment conducive to the land plants and animals, as well as microor- preservation of even the most delicate forms. ganisms including fungi (Taylor et al. 2004), The scarcity of reports of microscopic algae peronosporomycetes (Krings et al. 2012, 2013), from the Rhynie chert appears, at least in part, a lichen-like symbiosis (Taylor et al. 1997), to be due to the fact that important diagnostic green algae (Edwards & Lyon 1983, Dotzler characters (e.g. organelles, flagellar organiza- et al. 2007), cyanobacteria (Croft & George tion, pigmentation) are not normally preserved 1959, Krings et al. 2007, 2009), and bacteria (Dotzler et al. 2007). As a result, fossils repre- (Kidston & Lang 1921). senting the motile stages of microscopic algae 164 are difficult to identify and interpret (Sym from the pools, and subaerial soil/litter horizons with & Pienaar 1993); moreover, they may be eas- in situ plants that are thought to have grown along the ily confused with cyanobacterial cells or certain margins of the pools. Preservation of the biota is inter- preted as being a result of temporary flooding of the types of fungal propagules. On the other hand, site by waters rich in silica, or by groundwater high many microscopic algae are known to produce in silica percolating up to the surface (Powell et al. morphologically distinct non-motile (resting) 2000). The cherts have been dated as Pragian-?earliest stages (e.g. phycomata, cysts), which are often Emsian based on spore assemblages (Wellman 2006, Wellman et al. 2006). High-precision age constraints highly characteristic and abundant in the fos- on the Rhynie Lagerstätte indicate absolute ages of sil record. These are typically encountered in 407.1 ± 2.2 Ma (Mark et al. 2011) and 411.5 ± 1.3 Ma palynological samples, especially from marine (Parry et al. 2011). sediments (Colbath & Grenfell 1995, Tyson The assemblage of microfossils was identified in 1995). Two forms that are consistent in mor- a thin section prepared by cementing a thin wafer of the chert to a glass slide and then using silicon car- Cyma­ phology with the dispersed fossil genus bide to grind the rock chip until sufficiently thin to tiosphaera Wetzel ex Deflandre, which is com- transmit light. The slide is deposited in the Bayer- monly considered to represent the phycomata of ische Staatssammlung für Paläontologie und Geolo- prasinophyte algae (Colbath & Grenfell 1995), gie (SNSB-BSPG) at Munich, Germany, under acces- have been described from the Rhynie chert sion number SNSB-BSPG 1965 I 385. The slide was examined using normal transmitted light microscopy ( Dotzler et al. 2007, Kustatscher et al. 2014). equipment; digital images were captured with a Leica These fossils represent the oldest evidence of DFC-480 camera. prasinophytes in a freshwater paleoecosystem to date. Other than the specimens reported from the Rhynie chert, the earliest records of prasin- DESCRIPTION ophyte phycomata from freshwater paleoeco- systems come from the Pennsylvanian-Lower The assemblage of microfossils includes ca Permian (Doubinger 1967, Clausing 1993). 50 specimens (Pl. 1, figs 1, 2), which are pre- This paper describes an assemblage of sent within a loose accumulation of land plant Rhynie chert microfossils that closely resem- debris, fungal hyphae, and various types of ble Pterospermella A. Eisenack, a taxon used small propagules, most of which probably rep- for fossil structures that are morphologi- resent fungal (resting) spores. cally indistinguishable from the phycomata The microfossils consist of a smooth-walled, produced by members in the extant prasino- lens-shaped (i.e. dorsiventrally compressed) to phyte genus Pterosperma Pouchet (Pyramimo- more or less globose vesicle between (25–)30 nadales). This discovery adds to the diversity and 35(–38) μm in diameter (Pl. 1, figs 3–12). of fossil freshwater representatives of the pre- The vesicle wall varies in thickness, from dominantly marine prasinophytes. Moreover, < 0.5 μm in small (Pl. 1, figs 9, 10) to ~1.2 μm in the new microfossils indicate that the Early the largest specimens (Pl. 1, figs 3–8); in a few Devonian Rhynie ecosystem served as habitat specimens, the wall appears to be two-layered to several different prasinophytes. (Pl. 1, figs 4, 6). One or more prominent laevi- gate, straight or slightly undulating wings (alae) extend perpendicularly from the vesicle GEOLOGICAL SETTING, surface. One wing that is consistently present MATERIAL, AND METHODS in all specimens extends around the equator and divides the vesicle into two nearly equal The Rhynie chert locality is situated northwest of hemispheres. The equatorial wing extends out the village of Rhynie, Aberdeenshire, Scotland. The so- from the vesicle ca 8–10 μm and gives the vesi- called Rhynie Block in the northern part of the Rhynie cle a cingulate appearance. Additional wings Outlier consists of an extensive sequence of sedimen- tary and volcanic rocks. The fossil-bearing cherts occur present in some specimens may extend across in the Windyfield Shales Member, i.e. within the lower the surface (Pl. 1, fig. 5) or to the poles (Pl. 1, part of the Dryden Flags Formation (Parry et al. 2011). fig. 7), or divide the surface into triangular, This Lagerstätte is made up of fossiliferous beds con- quadrangular, or polygonal areas (Pl. 1, figs taining lacustrine shales and cherts that have been 11, 12); there does not appear to be a regu- interpreted as a series of ephemeral freshwater pools which existed within a hot-spring environment (Rice lar pattern to this ornamentation among the et al. 2002, Rice & Ashcroft 2004). Preserved within the specimens. In ca 20% of the specimens a cir- cherts are sinter surfaces, aquatic (freshwater) facies cular or oval orifice, between 5 and 7 μm in 165 diameter, occurs in one of hemispheres (arrows lens-shaped body into two hemispheres (Pl. 1, in Pl. 1, figs 10, 11). The orifice is consistently figs 3–8). Moreover, additional wings may be located slightly off center (i.e. not in polar posi- present (e.g. Pl. 1, figs 7, 11), but there is no tion). Moreover, in one specimen a prominent consistent pattern recognizable among the tube-like protrusion (~8.5 μm wide; arrow in specimens. As a result, we attribute the Rhynie Pl. 1, fig. 13) of the vesicle terminates in what chert microfossils to Pterospermella. Dotzler appears to be a thin-walled spheroid structure et al. (2007) indicated that virtually all Paleo- ca 30 μm in diameter. zoic prasinophyte phycomata known to date At least two of the specimens are colo- are described from macerated samples and nized by epibiotic chytrid zoosporangia (e.g. not thin sections. This makes it especially dif- arrows in Pl. 1, fig. 15) resembling Illmano­ ficult, if not impossible, to determine whether myces corniger M. Krings et T.N. Taylor (see the Rhynie chert phycomata represent a new Krings & Taylor 2014). Co-occurring with the species or have already been described based microfossils are several other spheroid prop- on palynological preparations. We therefore agules. One type (Pl. 1, fig. 14) is up to 40 μm follow Dotzler et al. (2007) and include the in diameter and characterized by a massive, Rhynie chert phycomata in open nomenclature multi-layered wall and irregularly wrinkled or as Pterospermella sp. rugose outer surface. An alternative interpretation associates the Rhynie chert microfossils with the problem- atic and ill-defined chlorellalean green algae DISCUSSION genus Trochiscia Kütz. (Oocystaceae, subfam- ily Lagerheimioideae; see Komárek & Fott Evidence of algae in the Rhynie chert has 1983) based on the occurrence in a freshwa- been very slow to accumulate.
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