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

Nupur BHOWMIK; Shabnam PARVEEN

Makale detayları

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

Yazarlar:

Nupur BHOWMIK | Shabnam PARVEEN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2012 Vol.36 Issue 2, pp.141-150

Belge Tipi:

Makale

Yayın Tarihi:

1/2012

Belge Dili:

Türkçe

Document ID (Org No.):

2000723030

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X

Özet:

 

This paper provides a description of a new species of Rugaspermum D.D.Pant & 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 D.D.Pant & Basu type of pollen grains.

 

This paper provides a description of a new species of Rugaspermum D.D.Pant & 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 D.D.Pant & Basu type of pollen grains.

Makale detayları

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

Yazarlar: Nupur BHOWMIK | Shabnam PARVEEN

Yayıncı: TUBITAK

Dergi: Turkish Journal of Botany 2012 Vol.36 Issue 2, pp.141-150

Belge Tipi: Makale

Yayın Tarihi: 1/2012

Belge Dili: Türkçe

Document ID (Org No.): 2000723030

Sıklık: İki Aylık

eISSN: 1303-6106

pISSN: 1300-008X

Sayı

Yazarlar:

Nupur BHOWMIK | Shabnam PARVEEN

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Botany 2012 Vol.36 Issue 2, pp.141-150

Belge Tipi:

Makale

Yayın Tarihi:

1/2012

Belge Dili:

Türkçe

Document ID (Org No.):

2000723030

Sıklık:

İki Aylık

eISSN:

1303-6106

pISSN:

1300-008X