caa a22 4500 469082852 CHVBK 20180323132955.0 cr unu---uuuuu 170328e19920201xx s 000 0 eng 10.1007/BF00302974 doi (NATIONALLICENCE)springer-10.1007/BF00302974 Junctional complexes of the branchia and gut of the tunicate, Pyrosoma atlanticum (Pyrosomatida, Thaliacea) [Elektronische Daten] [P. Burighel, G. Martinucci, N. Lane, R. Dallai] Summary: The branchia of pyrosomes has been found to be like that of ascidians in that it shares with the latter, besides the presence of peribranchial chambers, stigmata bordered by clusters of seven rows of flattened cells, each bearing a single row of long cilia. The intercellular junctions between ciliated cells of the branchial basket and between the cells lining the gut, in pyrosomes, have been studied in thin sections and by freeze-fracture. In both tissues tight and gap junctions are present, but the former are much more extensive in the gut. The gap junctions in the branchial basket exhibit some atypical features. Moreover, although there are extensive zonulae adhaerentes between the ciliated cells of the branchial basket, there are none between the epithelial cells of the intestinal tract. This feature of the branchiae, together with the alignment of their cells into highly ordered rows of seven cells, are similar to those found in some groups of ascidians. The evolutionary relationships between pyrosomes and the aplousobranch ascidians are considered in the light of these results. Springer-Verlag, 1992 Branchial stigmata nationallicence Gut nationallicence Epithelium nationallicence Cell junctions nationallicence Pyrosomatida, Pyrosoma atlanticum (Tunicata) nationallicence Burighel P. Department of Biology, University of Padua, Via Trieste 75, I-35100, Padua, Italy aut Martinucci G. Department of Biology, University of Padua, Via Trieste 75, I-35100, Padua, Italy aut Lane N. Department of Zoology, University of Cambridge, Cambridge, UK aut Dallai R. Department of evolutionary Biology, University of Siena, I-53100, Siena, Italy aut Cell and Tissue Research Springer-Verlag 267/2(1992-02-01), 357-364 0302-766X 267:2<357 1992 267 441 https://doi.org/10.1007/BF00302974 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00302974 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Burighel P. Department of Biology, University of Padua, Via Trieste 75, I-35100, Padua, Italy aut NATIONALLICENCE 700 1- Martinucci G. Department of Biology, University of Padua, Via Trieste 75, I-35100, Padua, Italy aut NATIONALLICENCE 700 1- Lane N. Department of Zoology, University of Cambridge, Cambridge, UK aut NATIONALLICENCE 700 1- Dallai R. Department of evolutionary Biology, University of Siena, I-53100, Siena, Italy aut NATIONALLICENCE 773 0- Cell and Tissue Research Springer-Verlag 267/2(1992-02-01), 357-364 0302-766X 267:2<357 1992 267 441 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer