A diverse new spider (Araneae) fauna from the Jinju Formation, Cretaceous (Albian) of Korea

A collection of spiders from the Cretaceous (Albian) Jinju Formation of Korea is described. These finds increase the number of known spiders from the Jinju Formation from one to 11. There is considerable diversity of mygalomorphs and araneomorphs, including palpimanoids (including lagonomegopids), as well as cribellate and ecribellate entelegynes. Such diversity among so few specimens hints that an even greater range of families will come to light as more specimens are discovered in the future. The first non-amber Lagonomegopidae are described, with the first preservation of a spider eye tapetum in the fossil record, providing evidence for lagonomegopid enlarged eyes being posterior medians. The female-biased sex ratio of lagonomegopids is discussed and it is concluded that the bias is fortuitous. http://zoobank.org/urn:lsid:zoobank.org:pub:7926A54F-1B64-417E-91B4-027FAFCC8C0A本文记述了一批采自韩国白垩纪阿尔布阶（Albian）晋州组（Jinju Formation）的蜘蛛化石标本。本次发现将晋州组已知蜘蛛类群的数量从1种提升至11种。该标本组合展现出极高的类群多样性，涵盖原蛛下目（Mygalomorphae）与新蛛下目（Araneomorphae），其中包括刺客蛛总科（Palpimanoidea，含拉戈姆蛛科Lagonomegopidae），以及具筛器与无筛器的真蛛类（Entelegynae）。即便当前标本数量有限，如此丰富的多样性已暗示：未来若发掘更多标本，或将揭示更多此前未被记录的蜘蛛科属类群。本次研究首次记述了非琥珀保存的拉戈姆蛛科（Lagonomegopidae）类群化石，同时也是化石记录中首次发现保存有蜘蛛眼反光层（tapetum）的实例，为拉戈姆蛛科的大型眼部为后中眼提供了实证支撑。研究还对拉戈姆蛛科标本的雌性偏倚性比展开讨论，最终得出该性比偏倚属于偶然现象的结论。http://zoobank.org/urn:lsid:zoobank.org:pub:7926A54F-1B64-417E-91B4-027FAFCC8C0A