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A new species of Laubierpholoe, L.massiliana Zhadan, 2023 (Annelida, Sigalionidae) was found in soft sediment of two submarine caves near Marseille, France. Molecular phylogenetic analysis using 18S rRNA and 28S rRNA sequences confirmed that the new species belongs to the genus Laubierpholoe. We were not able to amplify, and consequently, to sequence fragments of mitochondrial genes (CO1, 16S) of L.massiliana. To obtain these sequences, as well as to study the features of L.massiliana mitogenome, we attempted to sequence and assemble the mitochondrial genome of this species. The goal of this study is to know if the mitogenome of this cave species has peculiarities related with a cave life-style. Previously Gonzalez et al. (2021) studied the mitochondrial genomes of Polynoidae with different lifestyles and found similarities between cave and pelagic polynoids.