Trochophora larvae: Cell-lineages, ciliary bands, and body regions. 1. Annelida and Mollusca
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چکیده
منابع مشابه
Development of ciliary bands in larvae of the living isocrinid sea lily Metacrinus rotundus
Embryos and larvae of an isocrinid sea lily, Metacrinus rotundus, are described by scanning electron microscopy. Around hatching (35 h after fertilization), the outer surface of the gastrula becomes ubiquitously covered with short cilia. At 40 h, the hatched swimming embryo develops a cilia-free zone of ectoderm on the ventral side. By 3 days, the very early dipleurula larva develops a cilia-fr...
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The ciliary bodies from four rhesus monkey and six human eyes were subdivided into eight adjacent zones. The morphology of the ciliary epithelium and bordering stroma at the crests of the processes was examined electron microscopically in each region. In two of the monkey eyes (3 months and 18 years old) and in two of the human eyes (18 years and 55 years old) profiles of mitochondria, rough en...
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Nectins are Ca2+-independent immunoglobulin-like cell-cell-adhesion molecules consisting of four members. Nectins homophilically and heterophilically trans-interact to form a variety of cell-cell junctions, including cadherin-based adherens junctions in epithelial cells and fibroblasts in culture, synaptic junctions in neurons, and Sertoli cell-spermatid junctions in the testis, in cooperation ...
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A number of hypotheses have been presented regarding the origins of the metazoans and, more specifically, the Bilateria. Using various phylogenetic analyses, characteristics have been mapped on phylogenetic trees to infer ancestral body plans and life history strategies of those ancestors. Many arguments on the evolution of the Bilateria are based on the presumed homology of certain characteris...
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Individuals of the marine snail Trichotropis cancellata can either suspension feed or steal food from tube-dwelling polychaete worm hosts (kleptoparasitism). Because kleptoparasitism is facultative in this case, the performance of both members can be evaluated separately and together. I used field experiments to compare the growth of suspension feeding snails with that of snails (either singly ...
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ژورنال
عنوان ژورنال: Journal of Experimental Zoology
سال: 2004
ISSN: 0022-104X,1097-010X
DOI: 10.1002/jez.b.20001