Mertensiidae sp. A. Lateral views (A-D), oral view (E) and aboral view (F) of specimens observed on 27/11/2018 (MCMEC2018_Mertensiidae_sp_A_c) (A) and 15/11/2019 (MCMEC2019_Mertensiidae_sp_A_a) (B-F). Abbreviations: ad-c., adradial canal; a.p., anal pore; c.g., ciliary grove; m., mouth; o.t.s.o., oral end opening of tentacle sheath; p.p., polar plate; s. o., tentacle sheath opening; st., statocyst; ss-cr., substomodeal comb row; st-cr., subtentacular comb row; t.b., tentacle bulb. C-H photos courtesy: E. Cimoli.

  Part of: Verhaegen G, Cimoli E, Lindsay D (2021) Life beneath the ice: jellyfish and ctenophores from the Ross Sea, Antarctica, with an image-based training set for machine learning. Biodiversity Data Journal 9: e69374.