Early endosymbiotic interactions are recorded only from a Cretaceous termite and a cockroach. Mesoblatta maxi Hinkelman, gen. et sp. nov. is the second representative of the dominant, cosmopolitan Mesozoic family Mesoblattinidae known from Cenomanian northern Myanmar amber, and the fourteenth from both amber and sedimentary rocks. Unique characters are rare (n = 19), symplesiomorphies are frequent (n = 140), and foremost is a standard maxillary palp, an irregular area between forewing veins radius and media, central ocellus, and multisegmented styli, suggesting an ancestral position with respect to Blattidae. Autapomorphies of this otherwise conservative taxon are only its large size and a short probasitarsus. Two nymphs with fecal pellets protruding from their body, Blattocoprolites mesoblattamaxi Hinkelman, ichogen. et ichnosp. nov., represent the first cockroaches with formalized coprolites (along with Blattocoprolites blattulidae Hinkelman, ichnosp. nov. established herein from Lebanese amber) and provide evidence of burial defecation. Subhomogenic consistency of coprolites with mucous components, “pseudoinclusions,” leaf, trichia, wood debris, cycad pollen, endosymbiotic protists, and epibiotic bacteria directly document pollen transfer through the digestive tract and the earliest coevolution with protists and bacteria. Other post-burial fecal bacteria at the surface are documented for the first time in the Mesozoic, directly indicating structured dung processing. Reference samples (as well as almost all Myanmar amber samples) contain numerous “pseudoinclusions,” probably representing damaged or dead cysts of Chlamydomonas hanublikanus Vršanská et Hinkelman, sp. nov. established on the basis of its reproductive stages (with an origin within the resin inside the tree). These are documented together with green algae, including Spirogyra Nees, 1820; flagellates; and flagellate amoebae, promoting massive future microbiota studies.

中文翻译：

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缅甸琥珀蟑螂的粪便突出，含有花粉和丰富的微菌

早期内共生相互作用仅从白垩纪白蚁和蟑螂记录。Mesoblatta maxi Hinkelman，gen。等。十一月 是从缅甸北部的切诺曼尼亚人已知的，占主导地位的世界性中生代中生代Mesoblattinidae的第二个代表，而从琥珀色和沉积岩中都获得了第十四个代表。唯一字符很少（n  = 19），常见的是同形（n = 140），最重要的是一个标准的上颌pa骨，前突静脉半径与中突，中央眼球和多节针之间的不规则区域，暗示了suggest科的祖先位置。这种原本保守的分类单元的亚型只是其较大的长度和较短的基棘。两名若虫从体内突出粪便颗粒，Bichtocoprolites mesoblattamaxi Hinkelman，ichogen。et ichnosp。十一月，代表了第一批与形式化proprolites一起发生的蟑螂（以及Blattocoprolites blattulidaeichnosp欣克尔曼。十一月 （此处由黎巴嫩琥珀制成），并提供埋葬排便的证据。共质子与粘液成分，“假夹杂物”，叶，毛支，木屑，苏铁花粉，内共生质子体和表生细菌的亚同质性直接记录了花粉通过消化道的转移以及与质子和细菌最早的共同进化。在中生代首次记录了表面上的其他埋葬后粪便细菌，直接表明了结构化的粪便处理过程。参考样本（以及几乎所有缅甸琥珀样本）都包含大量“假夹杂物”，可能代表了衣藻衣藻的受损或死亡囊肿。Vršanskáet Hinkelman，sp。十一月 建立在其生殖阶段的基础上（起源于树内的树脂）。这些与绿藻一起记录在案，包括Spirogyra Nees，1820年；鞭毛 和鞭毛变形虫，促进未来大量微生物的研究。