FIGURE 3 in New cave-dwelling Plakina (Plakinidae, Homoscleromorpha, Porifera) from Martinique Island (French Antilles)

FIGURE 3. General organization of the tissue of Plakina doudou sp. nov. A) Semi-thin section showing two cinctoblastula embryos. B–D) Choanosome. E) Cinctoblastula embryo. F) Close-up of the cinctoblastula embryo. F) Transmission electron micrograph of the embryo. bc: basal cavity; bm: basement membrane; cav: central cavity; cc: choanocyte chamber; Ch: choanocyte; ciC: ciliated cells; cil: cilia; ec: exhalant canal; em: embryo; endo: endopinacoderm; exo: exopinacoderm; Fo: follicular cells; M: mesohyl; N: nucleus; NI: unidentified bodies. Oo: oocyte; Pi: flagellated endopinacocyte; sp: hole left by spicule; V: vitellus.