Fig. 1. Embryonic development of T. toreumaticus.

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Fig. 1. Embryonic development of T. toreumaticus. Embryonic development of T. toreumaticus. Embryos observed by light (C,D,F,K,L,N–P) or SEM (B,E,E′,G–J,M). (A) Schematic diagrams of a morula (upper) and blastula (bottom), lateral view. The area inside the black boxes was focused on using SEM. (B) The internal surface at the vegetal pole of an embryo 3.5 h after fertilization. (C) A morula 4 h after fertilization. (D,E) Blastulae 4.5 h after fertilization. The embryos had developed wrinkles (D, arrowheads). Blastomeres were still orbicular in shape (E,E′). E′ shows a higher magnification of area inside white box in E. (F,G) Blastulae 6 h after fertilization. The wrinkles had disappeared (F). At the vegetal pole (G), micromeres-descendants had kept their orbicular shape, but the cells around them had started to produce pseudopod-like structures. Insert, higher magnification of the area inside the white box in G. (H) An embryo 6.5 h after fertilization. As shown in the insert, which show a higher magnification of the area inside the white box, orbicular cells were surrounded by cells that extended pseudopod-like structures toward these cells and there was a ring of ECM at the vegetal pole that seemed to form a hole-like structure. (H′) A schematic diagram of the inside of the vegetal plate. Center, presumptive PMCs; outer, cells with pseudopod-like structures; blue lines, ECM. (I) A hatching blastula 7 h after fertilization. (J) An embryo 8.5 h after fertilization. PMCs migrated into the blastocoel as a mass (white dashed circle). (K–M) Embryos at 10 h (K), 11 h (L) or 11.5 h (M) after fertilization; dorso-ventral (K,L,N–P) or animal views (M). After migration, PMCs moved into a narrow blastocoel at the vegetal side. (N–P) Gastrulae 12.5 h (N), 13 h (O) or 15 h (P) after fertilization. The archenteron with the flat tip elongated toward the apical plate and then formed SMCs (N). The middle part of archenteron was narrower (O) and finally the tip attached to the apical plate (P). At this stage, there were some SMCs with filopodia (arrow). Scale bars: 20 μm in B,E,G–J,M; 50 μm in C,D,F,K,L,N–P. Chisato Kitazawa et al. Biology Open 2016;5:1555-1566 © 2016. Published by The Company of Biologists Ltd