. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 96 A. OKUSU. Figure 23. Beginning of the gradual process of metamorphosis (7- to 8-day-old larvae), (a) The post-trochal region of the apical cap has completely disappeared. The trunk has become covered with numerous large epidermal papillae, (b) A larva with its apical region withdrawn into the trunk, (e) Aragonitic larval spicules. restricted to the trunk region, have started to appear underneath the cuticle, (d) Regularly arranged spicules underneath the cuticle beside the foot. AT, apical tuft; CD. cerebral depression: E
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 96 A. OKUSU. Figure 23. Beginning of the gradual process of metamorphosis (7- to 8-day-old larvae), (a) The post-trochal region of the apical cap has completely disappeared. The trunk has become covered with numerous large epidermal papillae, (b) A larva with its apical region withdrawn into the trunk, (e) Aragonitic larval spicules. restricted to the trunk region, have started to appear underneath the cuticle, (d) Regularly arranged spicules underneath the cuticle beside the foot. AT, apical tuft; CD. cerebral depression: EP. epidermal papilla; Ft, foot; Sp. spicule; PP. pedal pit; Pt. prototroch; Tt, telotroch. Neomenia carinata are absorbed by the animal at metamor- phosis, as are the apical cap cells of E. babai: they degen- erate and in N. carinata are known to be the main food reserve of post-larvae (Thompson, 1960). The fate of the cells in the brooded larvae of Halomenia gravidu is not clear, although Heath (1918) observed in histological sec- tions that they become reduced in size at later stages, indicating resorption. There are some differences among neomenioid apla- cophoran species in the number of "test" cells and in num- ber of pairs of cerebral ganglia that proliferate from the test (Table 2). Test cells are arranged in six regular tiers of cells in Nematomenia banyiilensis and Rhopalomenia aglao- pheniae (Pruvot, 1890, 1892) and in five regular tiers of cells in Neomenia cannata (Thompson, 1960), whereas the apical cap cells of E. babai are numerous and irregularly ar- ranged. The number of cerebral ganglia invaginations also varies: there is one pair in E. babai, Nematomenia hanyulensis. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biologic
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
