New lagonomegopid spiders are described from Mid-Cretaceous Myanmar (Burmese) amber. Two new genera and species based on single specimens, Scopomegops fax gen. & sp. nov. and Hiatomegops spinalis gen. & sp. nov. are described. Two specimens belonging to Lineaburmops beigeli are further described. Additionally, after re-examining the holotype of Odontomegops titan, a detailed description of its basal ventral abdomen is added here. A phylogenetic analysis was performed to investigate the phylogenetic placement of Lagonomegopidae. A matrix of 79 morphological characters, scored for six lagonomegopid taxa and 26 non-lagonomegopid taxa, was analysed through parsimony and Bayesian phylogenetic inference. Our results recover extant Palpimanoidea as a monophyletic group and partly suggest that Lagonomegopidae is the sister-group to extant Palpimanoidea. The external sexual organs, retrolateral tibial apophysis on the male palp and tracheal spiracle in lagonomegopids are discussed.

中文翻译：

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来自中白垩纪缅甸琥珀的新标本阐明了 Lagonomegopidae（蛛形纲：蜘蛛目）的系统发育位置

新的 lagonomegopid 蜘蛛是从白垩纪中期的缅甸（缅甸）琥珀中描述的。基于单个标本的两个新属和新种，Scopomegops 传真根。＆sp。十一月 和 Hiatomegops spinis gen。＆sp。十一月 被描述。进一步描述了属于 Lineaburmops beigeli 的两个标本。此外，在重新检查了 Odontomegops titan 的正型后，在此添加了对其基底腹腹的详细描述。进行系统发育分析以研究 Lagonomegopidae 的系统发育位置。通过简约性和贝叶斯系统发育推断分析了 79 个形态特征的矩阵，对 6 个 lagonomegopid 分类群和 26 个非 lagonomegopid 分类群进行了评分。我们的结果恢复了现存的 Palpimanoidea 作为一个单系群，并部分表明 Lagonomegopidae 是现存的 Palpimanoidea 的姐妹群。讨论了外性器官、男性触须上的胫骨后突和lagonomegopids的气管气门。