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The genus    Smacigastes    Ivanenko &amp; Defaye, 2004 (  Harpacticoida  ,   Copepoda  ) is the most primitive genus in the family   Tegastidae   Sars, 1904, occurring in deep-sea chemosynthetic environments, such as hydrothermal vents, cold seeps, whale falls and wood falls. Our exploration of the Onnuri Vent Field, the sixth active hydrothermal vent system in the Central Indian Ridge, resulted in the discovery of a new species in the genus    Smacigastes   . A detailed morphological analysis of    S.   pumila    sp. nov.  reveals that it most resembles    S.   barti    Gollner, Ivanenko &amp; Martínez Arbizu, 2008, described from a hydrothermal vent in the East Pacific Ridge; the new species can be distinguished from the existing species by the 8-segmented female antennule, the absence of an abexopodal seta on the antennary basis, the mandibular exopod represented by a single seta and the exopod of the first leg with five setae. This is the first record of    Smacigastes    in the Indian Ocean. A dichotomous key to species of the genus    Smacigastes    worldwide is provided.

zoosystematics and evolution

A new species of the genus    Smacigastes    Ivanenko &amp; Defaye, 2004 (  Tegastidae  ,   Harpacticoida  ,   Copepoda  ) from the Onnuri Vent Field in the Indian Ocean