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Polygordius
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Description: "Development of Polygordius. a., Mother sperm cell; b., c., sperm morulae; d., spermatosoa. 1. Ovum with large nucleus; 2. two-cell stage; 3. four-cell stage; 4. blastosphere; 5. gastrula; ac., archenteron; 6. closure of gastrula mouth or blastopore; 7. formation of stomodaeum (st.), and proctodaeum (pr.), which invaginate to meet archenteron (ac.); 8. complete gut formed; 9. elongation of larva; ap. sp., posterior segments; 11. form of adult Polygordius." -Thomson, 1916
Source: Thomson, J. Arthur Outlines of Zoology (New York: D. Appleton & Company, 1916) 229
Keywords: polygordius worm, worm stages, worm life cycle, worm development, polygordius development
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