The mitogenome of the crab Grapsus adscensionis (Osbeck, 1765).

The mitochondrial genome of Grapsus adscensionis (Osbeck, 1765), a rocky shore crab distributed across the Macaronesian archipelagos and the eastern Atlantic, was sequenced and annotated for the first time. The circular mitogenome is 15,553 bp in length and comprises 13 protein-coding genes (PCGs), 22 tRNAs, two rRNAs, and a non-coding control region. It exhibits a strong AT bias, with negative AT- and GC-skews. Gene arrangement and composition are consistent with other brachyuran crabs. These findings provide novel molecular data for the species, representing the third mitogenome published for the genus Grapsus, and contribute to a better understanding of brachyuran evolutionary relationships.