. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CEMENT GLANDS IN SOME BARNACLKS amphrite) or in rosettes (B. nnbilis) intermingled with the ovarian follicles. In B. balanoidcs, on the other hand, they are scattered individually among the con- nective tissues in the basal portion of the animal. The number of cement gland cells appears relatively smaller in B. balanoidcs than in the other species examined. transversal muscle barnacle body muscle nauplius larvae blastula morula buccal plate cirrus external mantle internal mantle collector canal connective tissue. ovariole mu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CEMENT GLANDS IN SOME BARNACLKS amphrite) or in rosettes (B. nnbilis) intermingled with the ovarian follicles. In B. balanoidcs, on the other hand, they are scattered individually among the con- nective tissues in the basal portion of the animal. The number of cement gland cells appears relatively smaller in B. balanoidcs than in the other species examined. transversal muscle barnacle body muscle nauplius larvae blastula morula buccal plate cirrus external mantle internal mantle collector canal connective tissue. ovariole muscle fiber circular canal secondary canal principal canal cement gland cement FIGURE 1. Schematic drawing of a longitudinal section in Balanns sp., showing the internal anatomy and cement glands with canal system. Figure 1 is a schematic drawing of the anatomy of the typical balanid barnacle in longitudinal section. The structures include the cement glands among the ovarian follicles, the canal system, through which the cement secretion is conveyed to the basal portion of the animal, and the flat epithelium of the mantle, shown in lateral view. A. Secretory elements In B. nitbilis the cement glands are found in the connective tissue near the ovarian region. In the external zone of the mantle the glands appear to be in the early stages of development (Fig. 2), and consist of small cells differentiating in the walls of the principal and secondary canals (Fig. 3). The young cement glands form groups of 15 to 30 small cells which have dense homogeneous cytoplasm and a central nucleus rich in chromatin. During their development the gland cells become embedded deeper in the interior of the mantle-chamber and located in the connective tissue near the. 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 Biologica
Size: 1768px × 1414px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
