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Quarterly sampling campaigns during 2019 to study the diversity of meiofauna in a polluted estuary in northwestern Mexico revealed the subfamily  Stenheliinae  Brady, 1880 as one of the most important contributors to the diversity of benthic harpacticoids. Two new stenheliin species are described here. One of them was assigned to the, so far, monotypic genus    Lonchoeidestenhelia    gen. nov.  defined by the autapomorphic modified proximal outer spinules on the sigmoid process of the male  P2  ENP2 . The other species was assigned to    Willenstenhelia    Karanovic and Kim, 2014.    Lonchoeidestenhelia    gen. nov.  shares the armature formula of the  P1  EXP2 with    Stenhelia   ,    Anisostenhelia   , and    Beatricella   , but seems to bear a sister-group relationship with the former two genera by the loss of one inner seta on the  P2 – P3  EXP3, the presence of two outer spine-like elements on the male  P5  EXP , and the displacement of the outer spine and medial and inner distal setae of  P2  ENP3 , to an apical and subapical inner position, respectively, but is more closely related to    Anisostenhelia    by the overall shape of the male  P2  ENP2 .    Willenstenhelia   reducta    sp. nov.  is attributed to a group of species composed of    Wi.   minuta   ,    Wi.   urania   , and    Wi.   terpsichore    characterized by the strongly reduced inner seta of the female  P5  baseoendopod, but differs in the discrete female  P5  baseoendopods and in the presence of one outer seta only on that segment.    Willenstenhelia   reducta    sp. nov.  is defined here by the autapomorphic loss of the outermost seta of the female  P5  baseoendopod.

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On some new species of  Stenheliinae  Brady, 1880 (  Copepoda  ,   Harpacticoida  ,   Miraciidae  ) from north-western Mexico, with the proposal of    Lonchoeidestenhelia    gen. nov.