FIG. 2. — A in New data on embryonic development of Halisarca dujardini Johnston, 1842 (Demospongiae, Halisarcida)

FIG. 2. — A, cleaving embryos in 8-cell stage; B, blastula after immigration of external cells; C, stage of invagination of flagellate cells forming internal sphere; D, disphaerula of H. dujardini. Abbreviations: ec, embryonic capsule; ic, internal cells; n, nucleus; efc, external flagellate cells; b, blastomere; bi, blastocoel; ifc, internal flagellate cells; is, internal sphere; ppc, posterior pole cells; tc, transition cells. Scale bars: A, 20 µm; B, 15 µm; C, 20 µm; D, 10 µm.