Life History of Thalassema |
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a. d. Zool adult alimentary canal anal pouches animal anus appearance arise band of cilia become blastopore body body-cavity body-wall broad band changes ciliated band ciliated ring closely connection digestive tract disappears distinct dorsal early Echinoderms Echiuridae Echiurus ectodermal cells elongation embryo endodermal entirely extremity fertilization filled finally flattening floating gastrula germinal vesicle glands growth Hatschek intestine invagination irregular segmentation large number larval history mature mesenchyme mollusks motion mouth muscles muscular band nervous system nucleus oesophagus opening optical section oral lobe ordinary annelid ovum peculiar peri-visceral fluid peritoneal cells polar cells polar globule pole Polygordius post-oral lobe posterior pre-oral band pre-oral ciliated pre-oral lobe present region regular resting stage seen segmentation cavity sense-cilia Serpula setae sexual pouches sexual products shows soon spermatozoa spherical stomach structure supra-oesophageal ganglion surface swim Thalassema thickening tion trochosphere larva ventral chord vitelline membrane wandering cells