tailieunhanh - Rugaspermum minuta - a new species of the seed genus Rugaspermum from the Triassic of Nidpur, India

This paper provides a description of a new species of Rugaspermum & Basu, R. minuta Bhowmik & Parveen, from the Nidpur Triassic beds. The dispersed seeds were recovered after macerating large chunks of shale in hydrofluoric acid. | N. BHOWMIK, S. PARVEEN Research Article Turk J Bot 36 (2012) 141-150 © TÜBİTAK doi: Rugaspermum minuta – a new species of the seed genus Rugaspermum from the Triassic of Nidpur, India Nupur BHOWMIK*, Shabnam PARVEEN Palaeobotany and Morphology Laboratory, Department of Botany, University of Allahabad, Allahabad, . 211002 - INDIA Received: Accepted: Abstract: This paper provides a description of a new species of Rugaspermum & Basu, R. minuta Bhowmik & Parveen, from the Nidpur Triassic beds. The dispersed seeds were recovered after macerating large chunks of shale in hydrofluoric acid. The structurally preserved compressed seed is platyspermic, orthotropus, and oval- to barrel-shaped with a short beak-like micropyle. The surfaces of the seeds are wrinkled and there is a wide lateral ridge running from the apex to the base on both the obverse and reverse sides. Upon maceration, the seed yielded 4 membranes: outer, inner, nucellar, and megaspore membranes. The outer cuticle of the integument is thick and nonstomatiferous, while the inner cuticle is thin and delicate. The nucellar membrane is granular. The megaspore membrane is tough and dark-stained, showing obscure polygonal cell outlines. The pollen chamber is disc-shaped, containing the Rugapites & Basu type of pollen grains. Key words: Triassic, Rugaspermum, Rugapites, megaspore membrane, pollen Introduction Several dispersed, compressed seed genera, such as Savitrispermum Manik (1987), Nidispermum Manik (1987), Pyriformispermum Manik (1987), Rotundaspermum Manik (1987), Pantiaspermum Manik (1987), Rostrumaspermum . & Manik (1990), Delevoryaspermum . & Manik (1993), Tayloriaspermum . & Manik (1993), Sahnispermum . & Manik (1993), Cupolaspermum . & Manik (1993), Konaspermum . & Manik (1993), Urceolaspermum . & Manik (1993), and Chaturvedeacarpon . et al. (2001),

• Nông nghiệp
• Rugaspermum minuta
• Hydrofluoric acid
• Seed genus Rugaspermum
• Obscure polygonal cell outlines
• Beak like micropyle