FIGURE 18. Amathia medullaris Mawatari, 1972 in Korean ctenostome bryozoans-observations on living colonies, new records, five new species, and an updated checklist

FIGURE 18. Amathia medullaris Mawatari, 1972 (MBRBK1708). A. Portion of a live colony encrusting the alga Stephanocystis hakodatense. B. Cluster of zooids, many containing yellow embryos. C. Another view of live colony on alga with expanded (10-tentacled) tentacle crowns. D. Closely spaced squat zooids, with developing embryos. E. View of growing tip of a colony, with zooids aligned on stolon, but not massively clustered as in older areas of colony. F. Compound-microscope view of retracted zooids showing walls of tubes and part of a setigerous collar. G. More-magnified view of two zooids, both brooding embryos. Scale bars: B, E = 0.30 mm; D = 0.13 mm; G = 0.15 mm.