Yu Daoyuan, Deharveng Louis
Soil Ecology Lab, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, P. R. China. Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210014, Jiangsu Province, P. R. China..
Zootaxa. 2018 Apr 3;4403(1):50-60. doi: 10.11646/zootaxa.4403.1.2.
Two new species of Tomocerus are described from caves in Guizhou and Guangxi Province, China. Tomocerus troglodytes sp. nov. is highly troglomorphic. It belongs to the kinoshitai complex, and is most similar to another eyeless and colourless species Tomocerus caecus, from which it differs as it has longer antennae; 2,2/2,2/2+2/0 versus 2,2/2,5/0/0 cephalic dorsal chaetotaxy formula; 6 versus 4 central macrochaetae on Th. II; 0 versus 2 ungual teeth; unguis devoid of baso-internal ridges; 3-5/3-5, I, 0-1, I versus 4-5/1-2,I-II,0-1,I-II dental spines formula; 2-4 versus 1 tenacular chaetae; and 0 versus 1 mucronal intermediate teeth. In contrast, Tomocerus leyensis sp. nov. is at an earlier stage of troglomorphic adaptation. It resembles several cave-dwelling species of the ocreatus complex in habitus and shape of dental spines, but differs in the following characters: absence of large postantennal organ; cephalic dorsal chaetotaxy formula 2/2,4/2+2/2+2 versus other patterns; larger number of ungual teeth; and only 1 large distal dental spine. The troglomorphic characteristics of the two species are discussed with emphasis on their potential adaptation to cave habitats.
本文描述了采自中国贵州和广西洞穴的两种新的汤姆奥虫属物种。洞穴汤姆奥虫新种高度洞穴化。它属于木下氏类群，与另一种无眼无色的物种盲汤姆奥虫最为相似，但与其不同之处在于它具有更长的触角；头部背面刚毛序式为2,2/2,2/2+2/0，而盲汤姆奥虫为2,2/2,5/0/0；第二胸节的中央大刚毛为6根，而盲汤姆奥虫为4根；爪齿为0个，而盲汤姆奥虫为2个；爪无基部内侧脊；齿刺式为3-5/3-5, I, 0-1, I，而盲汤姆奥虫为4-5/1-2,I-II,0-1,I-II；触角刚毛为2-4根，而盲汤姆奥虫为1根；以及亚端中间齿为0个，而盲汤姆奥虫为1个。相比之下，乐业汤姆奥虫新种处于洞穴化适应的早期阶段。它在体型和齿刺形状上与奥克里亚图斯类群的几种洞穴栖息物种相似，但在以下特征上有所不同：没有大型触角后器；头部背面刚毛序式为2/2,4/2+2/2+2，与其他模式不同；爪齿数量更多；并且只有1个大型远端齿刺。文中讨论了这两个物种的洞穴化特征，重点强调了它们对洞穴栖息地的潜在适应性。
