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A) Histological section through the spermatheca of Riftia pachyptila (Vestimentifera) (Gc = Gonocoel, PO = Primary oocyte, S = Clusters of spermatozoa, St = Spermatheca) (from [135]). B) Two live males on the trunk of a female of an undescribed species of Osedax recovered in Antarctic waters. C) Brooding larva inside the tube of Siboglinum sp. (Frenulata). Scale bars: A = 200 µm, B = 100 µm, C = 500 µm.
