ABSTRACT Mimarachnidae is an extinct planthopper family of the superfamily Fulgoroidea, with a broad geographical distribution, known exclusively from the Cretaceous. Here, a new fossil species of Ayaimatum Jiang and Szwedo, 2020, Ayaimatum minutum sp. nov., is described and illustrated on the basis of two specimens from the mid-Cretaceous amber of northern Myanmar. We herein revised the diagnostic characters of Ayaimatum, and the intra-specific variation of A. minutum is discussed. Additionally, a new genus and species of Mimarachnidae, Mimaeurypterus burmiticus gen. et sp. nov., from the same Burmese (Myanmar) amber. Mimaeurypterus gen. nov. can be distinguished from other mimarachnids by its large body size, mesonotum with median carinae not reaching anterior margin, msoscutellum without distinct wrinkles, and broad, coriaceous tegmen with apical margin slightly truncate, sinuate. The new discovery further confirms that this extinct hemipteran group was diverse and had high morphological disparity during the late Mesozoic.

中文翻译：

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缅甸北部中白垩世琥珀中的新拟蛛科动物（半翅目，Fulgoromorpha）

摘要 Mimarachnidae 是飞虱总科的一个已灭绝的飞虱科，具有广泛的地理分布，仅从白垩纪才被发现。在这里，Ayaimatum Jiang 和 Szwedo 的一个新化石种，2020，Ayaimatum minutum sp。11 月，根据缅甸北部白垩纪中期琥珀的两个标本进行描述和说明。我们在此修改了Ayaimatum的诊断特征，并讨论了Ayaimatum的种内变异。此外，Mimarachnidae 的一个新属和种，Mimaeu​​rypterus burmeticus gen。等 sp. 11 月，来自同一个缅甸（缅甸）琥珀。Mimaeu​​rypterus gen. 十一月 可以通过其大的体型、中间隆突未到达前缘的中突、无明显皱纹的小骨板和宽阔的、宽的、皮质中盖具顶端边缘稍截形，波状。新发现进一步证实，这个已灭绝的半翅目动物在中生代晚期具有多样性和高度的形态差异。