The genus Mirovia Reymanowna (Pinopsida): systematics and characteristics of the leaf structure

N. V. Nosova

DOI: https://doi.org/10.31111/palaeobotany/2013.4.36

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The genus Mirovia was established by M. Reymanowna in 1985 for a single species M. szaferi Reymanowna described from the Middle Jurassic of southern Poland and originally referred to the ginkgoaleans. Later, M. N. Bose and S. Manum (1990) assigned it to the conifers, having chosen Mirovia as the type genus of the new family Miroviaceae.

The leaves of Mirovia are dimorphic — long and short. Long leaves are linear or lanceolate, short leaves being ⅓—.⁄₁₅ of the long ones, ovate-lanceolate, obovate or oval. Leaves are tapering towards the base, which is sometimes twisted. In some leaves, a small, 1—2 mm long, area at the base is plicate (pl. I, fig. 1—3, pl. II, fig. 7, 8, pl. V, fig. 3; Reymanowna, 1985, pl. I, fig. 2, 3, text-fig. A, M; Nosova, Wcisło-Luraniec, 2007, pl. 1, fig. 1, 13). Sometimes an abscission scar is preserved (pl. I, fig. 3, 4; Reymanowna, 1985, pl. I, fig. 2, 4; Nosova, Wcisło-Luraniec, 2007, pl. 1, fig. 13). There are two veins and 2—7 resin ducts in the leaf mesophyll. The leaves of Mirovia are characterized by stomata arranged in a single zone on the abaxial side of the leaf, which is not embedded into groove.

Records of Mirovia leaves are rather numerous in the Jurassic to the Cretaceous of Arctic Canada, Greenland, Europe, Middle Asia, Siberia and Far East (Florin 1922; Samylina, 1961, 1963; Abramova, 1985; Kiritchkova, 1985; Reymanowna, 1985; Manum, 1987; Bose, Manum, 1990; Manum et al., 1991; Hvalj, 1997; Watson et al., 2001; Nosova, 2001; Nosova, Wcisło-Luraniec, 2007; Gordenko, 2007, 2008; Nosova, Kiritchkova, 2008; Bugdaeva, Markevich, 2009).

For the first time, remains of Mirovia is reported here from the Late Cretaceous of the Sverdlovsk oblast’ (the Urals) and from the Tambov oblast’ (European Russia, age unknown). The epidermal structure of the leaves from the Sverdlovsk oblast’ fi ts the diagnosis of M. neosibirica (L. Abramova) N. Nosova from the Cenomanian-Turonian of the New Siberian Islands (Russia) (Abramova, 1985; Nosova, 2001; Nosova, Wcisło-Luraniec, 2007). The single leaf of Mirovia from the Tambov oblast’ has similar morphological and epidermal features to the leaves of M. szaferi from the Bathonian of Poland (Reymanowna, 1985; Nosova, Wcisło-Luraniec, 2007).

The epidermal structure of the leaves from the Early Cretaceous of the Lena coal basin (Eastern Siberia), identifi ed as M. macrophylla (Florin) N. Nosova (Nosova, Wcisło-Luraniec, 2007), was studied in detail. The diagnosis of M. sibirica (Samyl.) M. N. Bose et Manum (Samylina, 1963; Bose, Manum, 1990) from the Berriasian—Valanginian of the Lena coal basin is emended. The leaves of Mirovia from the Bajocian of Norway (M. macrophylla), the Kimmeridgian of Scotland (M. scotica (Florin) N. Nosova), and the Albian of West Greenland (M. hallei (Florin) N. Nosova), stored in the Museum of Natural History of Sweden (Stockholm), are reconsidered.

Diagnostic features of Mirovia leaves are discussed and an emended diagnosis of the genus is provided.

Section: Articles

How to cite

Nosova N. V. 2013. The genus Mirovia Reymanowna (Pinopsida): systematics and characteristics of the leaf structure. Palaeobotany, 4: 36—95. https://doi.org/10.31111/palaeobotany/2013.4.36

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