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Fig. 4. — A – B. Ptychogastria asteroides (Haeckel, 1879). A. Lateral view of a medusa. B. Portion of umbrella margin showing the arrangement of tentacles. — C – E. Ptychogastria polaris Allman, 1878. C. Medusa in lateral view. D. Oral view of half of the medusa, showing the arrangement of the marginal tentacles. E. Portion of the bell margin, greatly enlarged. — F – G. Tesserogastria musculosa Beyer, 1959. Medusa in lateral (F) and oral (G) aspects. [A, B redrawn after Gili et al. (1999); C, E redrawn after Panteleeva et al. (1999); D redrawn after Haeckel (1881 b); F, G redrawn after Hesthagen (1971)]. Scale bars: A, B = 500 µm; C = 3 mm; E = 2 mm

Glaciambulata neumayeri gen. et sp. nov., a new Antarctic trachymedusa (Cnidaria: Hydrozoa), with a revision of the family Ptychogastriidae