Title

"Rugaspermum stipitatus"-A New Species of the Seed Genus "Rugaspermum" Pant & Basu from the Triassic of Nidpur, M. P., India

DOI

10.6165/tai.2014.59.4.374

Authors

Nupur Bhowmik;Shabnam Parveen;Neelam Das

Key Words

Gymnosperm ; "in situ" pollen grains ; papillate ; "Rugaspermum" ; Seed ; Triassic

PublicationName

TAIWANIA

Volume or Term/Year and Month of Publication

59卷4期(2014 / 12 / 01)

Page #

374 - 382

Content Language

英文

English Abstract

The paper embodies description of a new species of the dispersed seed taxon "Rugaspermum" (Pant and Basu, 1977), "R. stipitatus", from the Triassic beds of Nidpur, M.P., India. The new species is distinct from earlier described ones ("R. insigne, R. media, R. obscura and R. minuta") in exhibiting a prominently demarcated wide stalk like rim at the chalazal end. The micropyle is short, tubular and not markedly protuberant. Seeds are about 3 mm long×2 mm wide, orthotropous, platyspermic, oblong to oval with broadly tapered ends. Seed surface is rough often appearing wrinkled. On maceration the seeds yield four membranes viz., outer, inner, nucellar and megaspore membranes. Outer cuticle is papillate and stomatiferous. Inner cuticle is thin and delicate. Nucellar membrane is free above forming a large dome shaped pollen chamber but fused to megaspore membrane at base. Pollen chamber containing striate, unwinged, "Rugapites" Pant and Basu type pollen grains that are remotely comparable to the polyplicate pollen types of gnetophytes. Megaspore membrane is thick, dark and wide. Pollination is possibly entemophilous.

Topic Category 生物農學 > 植物學
生物農學 > 動物學
生物農學 > 生物環境與多樣性
Times Cited
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