. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 4. Morphogenesis of the late ( = 9-1 Id) mesogen of Plcrasler lesselalus. Magnification is equal in all panels (except G, H) and all scale bars equal mm. In all lateral views the posterior of the mesogen is oriented to the left. See Table I for abbreviations. A. SEM. lateral view of 9d mesogen showing five marginal bulges and well developed podia. B. Drawing of lateral view of mesogen in panel A showing location and orientation of planes of section for the following panels of this figure. C,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 4. Morphogenesis of the late ( = 9-1 Id) mesogen of Plcrasler lesselalus. Magnification is equal in all panels (except G, H) and all scale bars equal mm. In all lateral views the posterior of the mesogen is oriented to the left. See Table I for abbreviations. A. SEM. lateral view of 9d mesogen showing five marginal bulges and well developed podia. B. Drawing of lateral view of mesogen in panel A showing location and orientation of planes of section for the following panels of this figure. C, D. SEM and interpretive diagram oi 9d mesogen sectioned in two planes and oriented obliquely to the viewer. Transverse face revealing the oral perivisceral coelom and elements of the hemal and water-vascular system in the oral region of the mesogen, especially the ampullae of the podia. Longitudinal face revealing an ampulla and the ectodermal covering of a cluster of podia. E-V. Paired light micrographs and interpretive diagrams of histological sections. E, F. Slightly oblique section of 9d mesogen showing the proximal lateral evaginations of the radial canals that fuse to form the circumoral ring canal of the water-vascular system. Also, the proximity of the hydropore canal to the small posterior enterocoel is visible. G. H. Transverse section at high magnification of an 8d ambulacrum revealing the proximal lateral evaginations of the radial canals that form the circumoral ring canal and showing the early development of a portion of the outer oral perihemal ring coelom. 1, J, K, L. Two longitudinal sections from the same lOd mesogen. These illustrate the ectodermal origin of the hydropore canal, it's confluence with the middle region of the small posterior enterocoel to form part of the axial complex, and the connection of the hydropore canal to the circumoral ring canal. M. N. Transverse section though the completed water-vascular system of an I Id mesogen. O, P. Transverse
Size: 1610px × 1551px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
