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Polygordius
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Description: "Diagrams of stages in the metamorphosis of Polygordius, a primitive annelid. Ectoderm throughout is represented as nucleated without cell boundaries; the entoderm has the cell-boundaries shown, and the mesoderm is diagonally shaded. A, gastrula; B, same with blastopore closed; C and D represent formation of stomodaeum and proctodaeum from ectoderm; E, Trochosphere stage showing formation of segments in the posterior portion; F, adult (sagittal); G, adult (transverse). a, archenteron; bp., blostopore; br, brain; c, coelom; d, dorsal; di, dissepiments; m, mesenteron; pr., proctodaeum; s.c., segmentation cavity; st, stomodaeum; v.n., ventral nerve chain; z, zone of formation of nerve segments." -Galloway, 1915
Source: Galloway, Thomas Walton Zoology (Philadelphia: P. Blakiston's Son & Co., 1915) 234
Keywords: polygordius stages, annelid metamorphosis, primitive annelid life, ectoderm, entoderm, mesoderm, gastrula, blastopore, stomodaeum, proctodaeum, trochosphere, sagittal, archenteron, blostopore, coelom, mesenteron, proctodaeum, segmentation cavity, stomodaeum, worm stages
Copyright: 2009, Florida Center for Instructional Technology. See license.
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