Multi-dimensional marine organisms dataviewer
Various stages in the development of Phallusia mammillata
| Organism | : | Ascidian |
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| Species | : | Phallusia mammillata |
| Description | : | Various stages in the development of Phallusia mammillata. (From Huxley; after Kowalevsky.) The embryos are represented in longitudinal vertical section. I. Commencing gastrula stage. fh. segmentation cavity. II. Late gastrula stage with flattened dorsal surface. eo. blastopore; ch. notochord; dd. hypoblast. III. A more advanced embryo with a partially-formed neural tube. ch. and dd. as before; n. neural tube; c. epiblast. IV. Older embryo in which the formation of the neural tube is completed. dd. hypoblast enclosing persistent section of alimentary tract; dd´. hypoblast in the tail; m. muscles. V. Larva just hatched. The end of the tail is not represented. a. eye; gb. dilated extremity of neural tube with otolith projecting into it; Rg. anterior swelling of the spinal division of the neural tube; f. anterior pore of neural tube; Rm. posterior part of neural tube; o. mouth; Chs. notochord; kl. atrial invagination; dd. branchial region of alimentary tract; d. commencement of œsophagus and stomach; dd´. hypoblast in the tail; m. muscles; hp. papilla for attachment. VI. Body and anterior part of the tail of a two days’ larva. klm. atrial aperture; en. endostyle; ks. branchial sack; 1ks. 2ks. branchial slits; bb. branchial vessel between them; ch. axial portion of notochord; chs. peripheral layer of cells. Other reference letters as before. |
| Website | : | http://gutenberg.polytechnic.edu.na/4/5/0/1/45019/45019-h/45019-h.htm |
| Licensing | : |
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| Tags | : | Gastrula Embryo Larva Development Notochord Tail |
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About the author
| Name | : | KOVALEVSKI Alexander |
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