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Simple Sponge Development
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Description: "Diagrams to illustrate the development of one of the simpler types of sponge: I, the egg; 2, section of 16- to 32-celled stage; 3, section of later stage, a ciliated larva (blastula); 4, gastrula; 5, section through older larva which has become attached by the end containing the blastopore. New openings break through by the coalescence and perforation of the ectoderm and entoderm, and and a form results... a, archenteron; bl., blastopore; ec., ectoderm; en., entoderm; mes., mesenchyma; s, segmentation cavity." -Galloway, 1915
Source: Galloway, Thomas Walton Zoology (Philadelphia: P. Blakiston's Son & Co., 1915) 166
Keywords: simple sponge development, sponge egg, blastula, gastrula, ectoderm, entoderm, archenteron, blastopore, mesenchyma, label sponge parts, sponge stages
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