Some groups of fossil beetles are difficult to study because the characters needed for identification or classification are hidden and difficult to study. Ptinidae is one of these groups. We describe herein Cretasernus spinosus gen. et sp. nov. (Coleoptera: Ptinidae) based on one fossil specimen, the only known specimen of this family from Kachin amber (mid-Cretaceous of Myanmar). The holotype was imaged using an X-ray micro-CT system to obtain high-quality 3D images to complement the structures visualized using optical microscopes. The new species shows two autapomorphic characters never described in any extant or extinct species in this family: a groove near the base of the 11th antennomere, which makes it appear as a much smaller additional antennomere, and transverse metacoxae touching at the middle. Phylogenetic analysis of the new species clearly supports this new genus as part of Anobiidae sensu stricto (i.e. excluding the spider beetles) despite antennae that are certainly more similar to those seen in the many of the spider beetles (except for the modified 11th antennomere). Some of the extant species in this family are wood-borers and the involvement of beetles in resin production during the Cretaceous is a hypothesis that is suggested often. However, some ideas against the involvement of Ptinidae in resin production within the mid-Cretaceous forests of Myanmar are discussed.

http://zoobank.org/urn:lsid:zoobank.org:pub:02CE8BF8-FC0C-4E39-8B75-FA70F2CBE2BB

某些化石甲虫类很难研究，因为识别或分类所需的字符是隐藏的且难以研究。tin科是其中之一。我们在这里描述Cretasernus spinosusgen。等。十一月 （鞘翅目：Ptinidae）基于一个化石标本，该家族的唯一已知标本来自克钦琥珀（缅甸白垩纪中期）。使用X射线微CT系统对整型成像，以获得高质量3D图像，以补充使用光学显微镜可视化的结构。新物种显示出该家族中任何一个现存或绝种物种都从未描述过的两个自变型特征：第11个触角虫基部附近的凹槽，使它看起来像一个较小的附加触角虫，而中间的横meta科触及。对新物种的系统进化分析清楚地支持了这一新属，这是Anobiidae sensustricto的一部分（即不包括蜘蛛甲虫），尽管触角肯定与许多蜘蛛甲虫中所见的触角更加相似（除了改良的第11天线虫）。这个家族中的一些现存物种是木钻，白垩纪期间甲虫参与树脂生产是一个经常提出的假设。但是，讨论了一些反对在非洲白垩纪中叶森林中牵牛科参与树脂生产的想法。

http://zoobank.org/urn:lsid:zoobank.org:pub:02CE8BF8-FC0C-4E39-8B75-FA70F2CBE2BB