Transposable elements (TEs) are mobile genetic elements that exist in the host genome and exert considerable influence on the evolution of the host genome. Since crustaceans, including decapoda, are considered ideal models for studying the relationship between adaptive evolution and TEs, TEs were identified and classified in the genomes of eight decapoda species and one diplostraca species (as the outgroup) using two strategies, namely homology-based annotation and de novo annotation. The statistics and classification of TEs showed that their proportion in the genome and their taxonomic composition in decapoda were different. Moreover, correlation analysis and transcriptome data demonstrated that there were more PIF-Harbinger TEs in the genomes of Eriocheir sinensis and Scylla paramamosain, and the expression patterns of PIF-Harbingers were significantly altered under air exposure stress conditions. These results signaled that PIF-Harbingers expanded in the genome of E. sinensis and S. paramamosain and might be related to their air exposure tolerance levels. Meanwhile, sequence alignment revealed that some Jockey-like sequences (JLSs) with high similarity to specific regions of the White spot syndrome virus (WSSV) genome existed in all eight decapod species. At the same time, phylogenetic comparison exposed that the phylogenetic tree constructed by JLSs was not in agreement with that of the species tree, and the distribution of each branch was significantly different. The abovementioned results signaled that these WSSV-specific JLSs might transfer horizontally and contribute to the emergence of WSSV. This study accumulated data for expanding research on TEs in decapod species and also provided new insights and future direction for the breeding of stress-resistant and disease-resistant crab breeds.

转座元件（TE）是存在于宿主基因组中的可移动遗传元件，对宿主基因组的进化产生相当大的影响。由于包括十足目在内的甲壳类动物被认为是研究适应性进化与 TE 之间关系的理想模型，因此使用两种策略（即基于同源性的注释）对 8 个十足目物种和 1 个双甲类物种（作为外群）的基因组中的 TE 进行了识别和分类。和从头注释。对TE的统计和分类表明，十足目中它们在基因组中的比例和分类组成是不同的。此外，相关性分析和转录组数据表明，中华绒螯蟹和拟青蟹基因组中存在更多的PIF-Harbinger TE ，并且PIF-Harbinger的表达模式在空气暴露胁迫条件下发生显着改变。这些结果表明，PIF-Harbingers 在E. sinensis和S. paramamosaiin的基因组中扩展，并且可能与它们的空气暴露耐受水平有关。同时，序列比对显示，所有八个十足目物种中都存在一些与白斑综合症病毒（WSSV）基因组特定区域高度相似的类骑师序列（JLS）。同时，系统发育比较发现，JLS构建的系统发育树与物种树不一致，各分支的分布存在显着差异。上述结果表明，这些 WSSV 特有的 JLS 可能会水平转移，并有助于 WSSV 的出现。该研究为扩大十足目物种TEs研究积累了数据，也为抗逆抗病蟹品种选育提供了新的见解和未来方向。