Gigantidas horikoshii is a species of large, deepwater, hydrothermal vent mussel, a marine bivalve mollusc in the family Mytilidae, the mussels.
Description Shells typically 160-170 mm in length, 60 mm in height, and 57 mm wide.Hashimoto J. & Yamane T. 2005. A new species of Gigantidas (Bivalvia: Mytilidae) from a vent site on the Kaikata Seamount Southwest of the Ogasawara (Bonin) Islands, Southern Japan. Venus, 64(1-2): 1-10
Distribution The type series was collected at a depth of 435-762 m from hydrothermal vents surrounding Kaikata Seamount, near the Ogasawara Islands, Japan. It has also been recorded from the Sumisu Caldera hydrothermal vent field at a depth of 694 m (31°28.2113'N, 140°4.2833'E) in the Izu Islands arc. Mellado et al. (2022) reported a juvenile specimen from waters to the east of Taiwan.
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