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Brood Chamber (brood + chamber)
Selected AbstractsOpened brood chamber with embryos of different stages from the demosponge Amphimedon queenslandica.GENESIS: THE JOURNAL OF GENETICS AND DEVELOPMENT, Issue 11 2009Article first published online: 19 NOV 200 Opened brood chamber with embryos of different stages from the demosponge Amphimedon queenslandica. This poriferan species has its genome sequenced, assembled, and annotated and serves as a model organism for sponge developmental biology. Image supplied by Bernie Degnan (University of Queensland). [source] Morphology of skin incubation in Pipa carvalhoi (Anura: Pipidae)JOURNAL OF MORPHOLOGY, Issue 11 2009Hartmut Greven Abstract South American Pipidae show a unique reproductive mode, in which the fertilized eggs develop in temporarily formed brood chambers of the dorsal skin after eggs have been deposited on the back of the female. We studied the skin incubation of Pipa carvalhoi using light microscopy and scanning electron microscopy. The skin consists of a stratified epithelium with a one-layered stratum corneum, and the dermis. The dermis of the dorsal skin of nonreproductive and reproductive females lacks a distinct stratum compactum, which is typical for most anuran skins. The entire dermis shows irregularly arranged collagen bundles like a stratum spongiosum. Before egg laying, the skin swells, primarily by thickening and further by loosening of the middle zone of the dermis. In the epidermis, large furrows develop that are the prospective sites of egg nidation. The epidermis, which forms a brood chamber around the developing egg becomes bi-layered and very thin and lacks a stratum corneum. Further, the dermis loosens and becomes heavily vascularized. Egg carrying females do not have mature oocytes in their ovaries indicating a slow down or interruption of egg maturation during this period. Similarities with the brood pouch of marsupial frogs are discussed. J. Morphol., 2009. © 2009 Wiley-Liss, Inc. [source] | ||||||||||