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Formal System of Dispersed Leaf Cuticles of Pteridosperms (Peltaspermaceae) from the Permian and Triassic of the Russian Platform E

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Formal System of Dispersed Leaf Cuticles of Pteridosperms (Peltaspermaceae) from the Permian and Triassic of the Russian Platform E ISSN 00310301, Paleontological Journal, 2013, Vol. 47, No. 3, pp. 335–349. © Pleiades Publishing, Ltd., 2013. Original Russian Text © E.V. Karasev, 2013, published in Paleontologicheskii Zhurnal, 2013, No. 3, pp. 98–112. Formal System of Dispersed Leaf Cuticles of Pteridosperms (Peltaspermaceae) from the Permian and Triassic of the Russian Platform E. V. Karasev Borissiak Paleontological Institute of the Russian Academy of Sciences, Profsoyuznaya, 123, Moscow, 117997 Russia email: [email protected] Received April 11, 2012 Abstract—A formal system of dispersed leaf cuticles of peltaspermaceous pteridosperms is proposed. It is based on the epidermal groups established on the basis of correlation between epidermal features and leaf morphology of peltasperms. Keywords: dispersed cuticles, gymnosperms, Permian, Triassic, Russian Platform DOI: 10.1134/S0031030113030052 INTRODUCTION into formal taxa of generic and species ranks is based Plant mesofossils, in particular, dispersed leaf cuti on congregational principle. cles supplement information about the taxonomic The formal classification developed in the present composition of paleofloras and taxonomic diversity of study differs from differs from Meyen’s classification extinct plant communities. In some cases, plant meso (1965) in the absence of restrictions on the number of fossils are almost the only source of paleobotanic genera and, in contrast to the classification of Rozelt information. In the presence of macroremains, dis and Schneider (1969) it takes into account specific persed cuticles of plants can be additionally used for stomatal types characteristic of fossil gymnosperms. determination of features of paleoenvironments (Kur This reduces the loss of important information for schner, 1996; McElwain and Chaloner, 1996; Retal assignment to higher taxa. lack, 2001). Systematically ordered dispersed cuticles Meyen (1987, 2009) indicated the main distinction can bear diagnostic function in the case of finding between natural and formal taxa. Natural taxa can be leaves similar in epidermal structure. In addition, they distinguished by any characteristic of the whole organ can be used for comparison with similar dispersed ism. The choice of characteristics depends on the cuticles from other localities. In the long run, dis researcher and available technical equipment. When persed leaf cuticles can be used for comparison of establishing parataxa, only characters preserved in dis paleofloristic assemblages from various localities. persed parts are used. Thus, the diagnoses of formal The data on dispersed leaf cuticles are presented in taxa should not contain characteristics that are diffi many works (Meyen, 1965; Krassilov, 1968; Roselt cult or impossible to diagnose in mesofossils. Suitable and Schneider, 1969; Oldham, 1976; Kovach and characteristics include features of the epidermal struc Dilcher, 1984; Kerp and Barthel, 1993; Upchurch, ture in marginal and midvein zones, petioles, etc. 1995; Gomankov, 1997; Tewari and Agarwal, 2001; In the present study, I propose a formal system for Pole, 2007, etc.). dispersed cuticles of peltaspermaceous pteridosperms To date, several formal classifications have been based on extensive material from the Permian–Trias proposed for dispersed cuticles. The best known are sic deposits of the Nedubrovo and Vyazniki localities. the system by Meyen (1965) for dispersed cuticles of The system reflects stable epidermal types in this gym the gymnosperms and the system by Roselt and nosperm group; it inherits the principle of division Schneider (1969) mostly for dispersed cuticles of into turmas (depending on a stomatal arrangement on angiosperms. The latter was improved by Kovach and the leaf cuticle) from the formal system of Rozelt and Dilcher (1984). The Meyen`s system is based on a Schneider (1969). limited number of epidermal characters and com The following requirements are imposed on the prises a certain number of formal taxa. The system of system of dispersed cuticles of peltaspermaceous Rozelt and Schneider includes highrank taxa, such leaves: (1) the system should be suitable for compari as turmas and subturmas. It is based on the division son of dispersed cuticles from different localities; by the type and arrangement of stomata. The division (2) whenever possible, the system should be tightly 335 336 KARASEV connected with leaf morphology, promoting recon FOUNDATION AND PRINCIPLES struction of the morphology of initial objects (leaves) OF FORMAL CLASSIFICATION and specification of taxonomic diversity. Upchurch (1989) suggested to subdivide all dis persed cuticles into three types: (1) cuticle fragments MATERIALS AND METHODS of abaxial epidermis characterized by a large number of diagnostic features important for classification; The collection of dispersed cuticles consists of leaf (2) cuticle fragments of adaxial epidermis usually phytoleim fragments of peltasperms and conifers from showing fewer systematically important features (sto the Vyazniki, Vyazovka (Late Permian), and Nedu mata are few or absent); and (3) cuticle fragments of brovo (Permian–Triassic) localities (Lozovskii et al., stems, petioles, and rachises. Rows of longitudinally 2001; Krassilov and Karasev, 2009; Benton et al., elongated ordinary cells are characteristic of such 2010). The material was collected by researchers of the fragments (stomata are few or absent). Laboratory of Paleobotany and the Laboratory of The division of cuticles into these categories and Arthropods of the Borissiak Paleontological Institute priority use of dispersed cuticles of the first type of the Russian Academy of Sciences, Moscow (PIN). resolve two problems which are inevitably raised in the Plant fragments were macerated by a standard course of classification: (1) If cuticles of the upper and technique, using Schultz solution without potassium lower leaf sides are found separately, these cuticles can chloride addition and, then, washed in sequence by be classified to different formal groups, especially of KOH and distilled water. The cuticle fragments hypostomatal leaves (or leaves with different structure obtained were studied with an AXIOPLAN2 light of adaxial and abaxial parts); (2) the problem of differ microscope and a CAMSCAN (SAM) electron scan ent structure of epidermis, depending on leaf parts. ning microscope. The material is stored in the Boris Cuticles of the second and third types can be used siak Paleontological Institute of the Russian Academy for identification of characteristic epidermal features of Sciences, Moscow; collection nos. 4180 and and diagnostics of morphotaxa. They also can be no. 5160. assigned to formal taxa, comparing with cuticles of the Epidermal features of dispersed cuticles were ana first type. lyzed with the Delta Key Program (Dallwitz, 1980); The newly established turma Peltarimatae unites biometric studies were made using the Image J Pro all dispersed leaf cuticles of peltaspermaceous pteri gram (Sheffield, 2007). dosperms. The identification of dispersed cuticles of peltasperms requires a set of characters that distin guishes them from other plant groups. The diagnosis TERMINOLOGY of Peltaspermaceae provided by Gomankov and In the present paper, dispersed leaf cuticles mean Meyen (1986) lacks epidermal characteristics. It is fragments of leaf phytoleims retaining epidermal fea evident that, among the entire set of cuticular epider tures, but without distinct morphological characteris mal features, it is impossible to recognize a unique tics suitable for the determination of known taxa or marker character that would provide reliable attribu description of a new one. tion of dispersed leaf fragments to peltaspermaceous The epidermal structure of dispersed cuticles is pteridosperms. However, this also concerns morpho described using the standard terminology (Stace, logical leaf features. Note that the epidermis of pel 1965; Krassilov, 1968; Dilcher, 1974; Anderson and tasperms is rather distinctive, but largely uniform. Anderson, 1989). The peltaspermaceous stomata are The family Peltaspermaceae includes about described using special terms proposed by Gomankov 30 genera based on leaves and shoots. Almost two and Meyen (1986). The structure located around the thirds of them are not characterized by epidermal stomatal aperture on the outer side is termed the characters; these taxa were mostly established from Florin ring, which is defined by Anderson and Ander leaf imprints (Thomas, 1933; Townrow, 1960; son (1989) as a raised ringshaped structure formed by Gomankov and Meyen, 1986; Taylor et al. 2006; papillate periclinal walls of subsidiary cells. Mesozoic Seed Ferns …, 2009). The characteristics of Some terms demand additional explanation. The ten genera contain epidermal features. Epidermal fea stomatal outline formed by tangential (distal) walls of tures which are useful for generic identification of dis subsidiary cells is considered regular if none of subsid persed cuticles of peltasperms are shown in Table 1. iary cells protrudes for more than half length relative to If the necessary epidermal features on dispersed the other subsidiary cells. The stomatal outline is con cuticles are available, it is possible to determine with sidered irregular if at least one subsidiary cell protrudes sufficient confidence three genera of peltasperma for more than half length from the contour formed by ceous leaves: Tatarina Meyen, Vjaznikopteris Naugol other subsidiary cells. The orientation of stomatal nykh, and Autunia Krasser. apertures is described
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