Corpus ID: 90229441

Phylogenetic Relationships within Theinvertebrata in Relation to Thestructure of Septate Junctions and the development of ‘Occluding’ Junctional Types

  title={Phylogenetic Relationships within Theinvertebrata in Relation to Thestructure of Septate Junctions and the development of ‘Occluding’ Junctional Types},
  author={C. Green and P. R. Bergquist},
  journal={Journal of Cell Science},
The structures of 13 variants of invertebrate septate junction are reviewed on the basis offreeze-fracture, lanthanum tracer and thin-section studies. In addition, a simple type ofoccluding junction in the phylum Porifera, a variation of tight junction in the phylum Tunicateand the vertebrate tight junction are covered. All the junctions considered form a belt around the apical circumference of cells lining a lumen or an exterior surface. The large number of these junctions now recognized… Expand
Junctional complexes of the branchia and gut of the tunicate, Pyrosoma atlanticum (Pyrosomatida, Thaliacea)
SummaryThe 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 sevenExpand
Sealing junctions in a number of arachnid tissues.
It appears probable that the septate junctions in Arachnida, Merostomata and Myriopoda have different fracturing properties from those found in other arthropods. Expand
Tight and gap junctions in the intestinal tract of tunicates (Urochordata): a freeze-fracture study.
The intestinal tracts from seven different species of tunicates, some solitary, some colonial, were studied fine-structurally by freeze-fracture to find junctions more similar to those found in the tissues of vertebrates, than to those in the invertebrates, which the adult zooid forms of these lowly chordates resemble anatomically. Expand
Biology of Dicyemid Mesozoans
Recent phylogenetic studies suggest dicyemids are a member of the Lophotrochozoa, and the shape of the calotte changes from conical to cap-shaped and discoidal in some species, and appears to result from adaptation to the structure of host renal tissues. Expand
Different functions of tight junctions in the ascidian branchial basket.
Tight junctions are capable both of forming permeability barriers, in that they can be seen to prevent the entry of exogenous tracers such as lanthanum, and of acting as adhesive devices. Expand
A novel adhering junction in the apical ciliary apparatus of the rotifer Brachionus plicatilis (Rotifera, Monogononta).
Cultures of the rotifer Brachionus plicatilis were examined with regard to their interepithelial junctions after infiltration with the extracellular tracer lanthanum, freeze-fracturing or quick-freeze deep-etching, finding novel structures that appear to represent a distinct new category of adhesive cell-cell junction. Expand
Cell junctions in the gut of Protura.
The main cell junctions in the intestinal tract of a small group of apterygotan insects, Protura, were examined in conventional thin sections, tracer-infiltrated sections and freeze-fracture replicas to provide further evidence relating Protura closely to Collembola as well as to primitive arthropods. Expand
Fine structure of dicyemid mesozoans, with special reference to cell junctions
Ciliary rootlet systems at vermiform stages and in infusoriform embryos were unique in structure compared with those of other primitive multicellular animals. Expand
Origin of animal epithelia: insights from the sponge genome
The results indicate that the majority of “epithelial” genes originated in metazoan or eumetazoan lineages, with only two genes, Par‐1 and Discs large, antedating the choanoflagellate‐metazoan split. Expand
Occluding junctions of invertebrate epithelia
In this review, information on occluding junctions of invertebrate epithelia is consolidated and discussed in the context of morphology, ultrastructure and physiology. Expand