中文摘要：

描述鉴定了来自中国内蒙古自治区道虎沟九龙山组中侏罗世的3个化石新种，长角类天牛Parandrexis longicornis Lu，Shih＆Ren sp．nov．，敏慧类天牛P.agilis Lu，Shih＆Ren sp．nov．和长圆类天牛Poblongis Lu，Shih＆Rcn sp．nov．。这3个新物种区别于类天牛其他物种的特征在于体型大小、头部形状（长宽比）、前胸背板形状和独特的触角。根据这些形态特征数据，本文修订了类天牛属属征。这些发现进一步证明了类天牛科具有雌雄二重性以及取食裸子植物汁液的食性。

英文摘要：

Three well-preserved fossil species ofParandrexis longicornis Lu, Shih ＆ Ren sp. nov., P. agilis Lu, Shih ＆ Ren sp. nov. and P. oblongis Lu, Shih ＆ Ren sp. nov. are described and illustrated from the late Middle Jurassic Jiulongshan Formation of Daohugou in Inner Mongolia Autonomous Region, China. These new species are distinguished from other described species of Parandrexis by body size, head dimension （ratio of length to width）, pronotum shape, and antennal characters. Based on new morphological data, we emend the generic diagnosis. These findings support the sexual size dimorphism of parandrexids and suggest a gymnosperm sap feeding habit by Parandrexis.