…Protodragonfly insects flourished from the late Carboniferous to the Permian period, and became extinct in the early Mesozoic era. Meganeuropsis , a protodragonfly discovered in an early Permian layer in Oklahoma, USA, has a wingspan of 33 cm, making it comparable in size to Meganeura. Since only wings have been found in fossils of this genus, it was once assumed to have a cylindrical thorax and abdomen like modern dragonflies, but recently it has been thought to have had a wide, flattened body more similar to proto-etrichoptera than dragonflies, and to have been less active than dragonflies. … *Some of the terminology explanations that mention "Meganeuropsis" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…原トンボ類の昆虫は,石炭紀後期より二畳紀にかけて栄え,中生代の前期に絶滅した。アメリカ,オクラホマ州の二畳紀前期の地層から発見された原トンボ類に属するMeganeuropsisは,翅長33cmでその大きさはメガネウラに匹敵する。この類の化石は翅だけしか見つかっていないので,かつては現生トンボと同様の円筒形の胸部,腹部が想定されたが,最近はトンボよりも原網翅類などに似た,幅が広く,扁平な胴体をもち,トンボほど活発には活動しなかったと考えられるようになった。… ※「Meganeuropsis」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
Date of birth: July 6, 1221 A Tendai Buddhist monk...
A sowing device invented early on for the dryland ...
Year of death: October 4, 1855 (November 13, 1855)...
Upper Memory AreaMemory area from 640KB to 1MB def...
A member of the imperial family at the end of the ...
… The land of an ejido is governed by a different...
... The seals used by the Israelites were widely ...
…[Kou Aoki]. … *Some of the terminology that ment...
Dates of birth and death unknown. A scholar of th...
The Society for the Diffusion of Christian and Gen...
…There are two main types of SA: hard systems met...
A type of double oxide mineral. It is also called...
In this period, the conservatives who remained in...
...In Chinese, it refers to the reaction of human...
This Otani-ha Shinshu temple is located in Teramac...