... gametogenesis, the transition from a single large gamontic nucleus to the thousands of tiny gametic nuclei is complete. Observations on sectioned material, however, indicate that X. minuta , like many other monothalamous foraminiferans, undergoes at least some version of the zerfall process. In other species...

... of the juvenile gamonts and agamonts, the early biologists made considerable progress in unravelling the life cycle of foraminifera. Key workers were the British protozoologists Joseph Jackson Lister (1857–1927) and Margaret Wolfe Jepps (1892–1977). The German Fritz Schaudinn (1871–1906), a contemporary of Lister...

... the existence of two generations, microspheric agamonts and megalospheric gamonts, that differ in test morphology, nuclei and reproductive behavior (dimorphism). In many species, a megalospheric schizont occurs in addition to the gamont and agamont generations (trimorphism). In many trimorphic species, two size...

... to include cycles of gamonts, agamonts and schizonts, and the embryonic apparatus-bearing forms may correspond to the gamont A2 generation. Our giant fusulinids from northern Afghanistan were collected by A.F. de Lapparent and E. Bouyx during the 1960’s. Preliminary geological results were published...

... Triticites ( Wilde, 1965 , pl. 20, fig. 2). As stated by Wilde, in neither case is it clear whether the juvenile was alive or whether it continued to live and grow. Apparent double tests can result from plastogamy, in which two gamonts attach to each other at the apertural face to exchange their gametes...

... an expansive, flat last whorl, N. venosus tests show such test construction only in very large specimens. The smaller sizes of the latter led to the interpretation of both species as different generations, where the smaller forms were regarded as A-generation (gamonts or schizonts), and the larger as B...

... coated with 20 nm of Au. Baculogypsina sphaerulata has only one or two spherical nuclei (Pl. 2, Figs. 9, 11 ) that are located in the umbilical region of a penultimate whorlf Because they have only one or two nuclei, the specimens collected are likely to have been gamonts. Various sized...

.... Small vesicles lie just beneath the cell membrane and merge with the plasma membrane to release test construction materials at the base of the IOL. This species is gametogamous, where gamonts release biflagellated gametes either through the aperture or within membrane-bound packets that open following...

... (1.5 μm) of endoplasmic reticulum overlain by a layer of vesicles of unknown function. Gamonts release many small biflagellated gametes through the aperture directly into surrounding seawater. Fine cytological examination of the test suggests that this new allogromiid shares a similar constructional...

... and freeze substitution shows that the test has a complex fine structure that varies in thickness. It consists of two layers: a thick inner layer with a “herringbone” fine structure, and a thinner, outer electron-opaque mesh-like layer that occurs in patches. The number of nuclei varies per individual...