ব্যবহারকারী:Eftekhar Naeem/নানজিঙ্গানথাস ডেন্ড্রোস্টাইলা

নানজিঙ্গানথাস ডেন্ড্রোস্টাইলা is a fossil plant known from Early Jurassic sediments in China and proposed by Fu, et al. to represent a pre-Cretaceous angiosperm. The material consists of numerous compression fossils which bear a resemblance to flowers. The segments bear prominent ridges, suggesting veins, and a few specimens have a branched axis perpendicular to the segments, interpreted by Fu, et al. as a branched style. Beneath the putative perianth, Fu, et al. interpret the existence of ovules enclosed in ovaries, however, the preservation of this region of the structure is poor.

If this fossil is an angiosperm, it would extend the first appearance of angiosperms by 50 million years.^[১]^[২]

The interpretation of Nanjinganthus as an angiosperm is disputed by Coiro, Doyle & Hilton (2019), who suggest the fossils are more consistent with a conifer, representing either fragmented pollen cones or axes which bore ovuliferous cone scales.^[৩] Other authors have advanced similar criticisms, particulartly disputing the interpretation of the pentamerous nature of the perianth and supporting the interpretation as a conifer cone. ^[৪]

↑ Fu, Qiang; Diez, Jose Bienvenido; Pole, Mike; Ávila, Manuel García; Liu, Zhong-Jian; Chu, Hang; Hou, Yemao; Yin, Pengfei; Zhang, Guo-Qiang (২০১৮-১২-১৮)। "An unexpected noncarpellate epigynous flower from the Jurassic of China"। eLife (ইংরেজি ভাষায়)। সংগ্রহের তারিখ ২০১৮-১২-২৪।
↑ "Fossils suggest flowers originated 50 million years earlier than thought"। ScienceDaily (ইংরেজি ভাষায়)। সংগ্রহের তারিখ ২০১৮-১২-২৪।
↑ Mario Coiro; James A. Doyle; Jason Hilton (২০১৯)। "How deep is the conflict between molecular and fossil evidence on the age of angiosperms?"। New Phytologist। in press (1): 83–99। ডিওআই:10.1111/nph.15708 । পিএমআইডি 30681148।
↑ Sokoloff, Dmitry D.; Remizowa, Margarita V.; El, Elena S.; Rudall, Paula J.; Bateman, Richard M. (২০১৯)। "Supposed Jurassic angiosperms lack pentamery, an important angiosperm-specific feature"। New Phytologist (ইংরেজি ভাষায়)। 0। আইএসএসএন 1469-8137। ডিওআই:10.1111/nph.15974 । পিএমআইডি 31418869।

[1] Fu, Qiang; Diez, Jose Bienvenido; Pole, Mike; Ávila, Manuel García; Liu, Zhong-Jian; Chu, Hang; Hou, Yemao; Yin, Pengfei; Zhang, Guo-Qiang (২০১৮-১২-১৮)। "An unexpected noncarpellate epigynous flower from the Jurassic of China"। eLife (ইংরেজি ভাষায়)। সংগ্রহের তারিখ ২০১৮-১২-২৪।

[2] "Fossils suggest flowers originated 50 million years earlier than thought"। ScienceDaily (ইংরেজি ভাষায়)। সংগ্রহের তারিখ ২০১৮-১২-২৪।

[3] Mario Coiro; James A. Doyle; Jason Hilton (২০১৯)। "How deep is the conflict between molecular and fossil evidence on the age of angiosperms?"। New Phytologist। in press (1): 83–99। ডিওআই:10.1111/nph.15708 । পিএমআইডি 30681148।

[4] Sokoloff, Dmitry D.; Remizowa, Margarita V.; El, Elena S.; Rudall, Paula J.; Bateman, Richard M. (২০১৯)। "Supposed Jurassic angiosperms lack pentamery, an important angiosperm-specific feature"। New Phytologist (ইংরেজি ভাষায়)। 0। আইএসএসএন 1469-8137। ডিওআই:10.1111/nph.15974 । পিএমআইডি 31418869।

[১]

[২]

[৩]

[৪]