Complete genome sequence of <i>Thiomicrospira</i> sp. strain V2501 isolated from 250 m below the ground level in Horonobe, Hokkaido, Japan

A thiosulfate-oxidizing bacterium, <i>Thiomicrospira</i> sp. strain V2501, was isolated from groundwater collected in a terrestrial deep subsurface environment. This strain was capable of chemolithoautotrophic growth on CO₂ and thiosulfate. Here, we report the 2,240,851 bp complete genome sequence of strain V2501.