Ultramicrostructure of bilamellar walls in foraminiferida

• H.J. Hansen ^[2] ; Z. Reiss ^[1] ; N. Schneidermann ^[1]
  1. [1] Hebrew University of Jerusalem

     Hebrew University of Jerusalem

     Israel

     
  2. [2] Geological Institute, Copenhagen, Denmark
• Localización: Revista española de micropaleontología, ISSN 0556-655X, Vol. 1, Nº. 3, 1969, págs. 293-316
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Light-microscope, as well as scanning-and transmission-electron microscope studies of Heterolepa cf. H. subhaidingeri (Parr), Gavelinella lorneiana (d'Orbigny), Ceratobulimina (Ceratobulimina) pacifica Cushman and Harris, Globorotalia truncatulinoides (d'Orbigny), Globorotalia menardii (d'Orbigny), Globigerinoides sacculifer (Brady), and Pulleniatina obliquiloculata (Parker and Jones) show the chamber walls of these species to be constructed of three layers, viz. an outer lamella covering previously formed parts of the test; an inner lining confined to each chamber and wedging out at the junction of the previous septum or covering (in Ceratobulimina) the whole previous septum; and by a median organic layer of spongy nature between them and stopping abruptly at the junction with a previous septum. This structure conforms to the model of the so-called "bilamellar", test formation pattern.

    25 scanning and transmission electronmicrographs and 7 photomicrographs illustrate the features discussed.