. Bulletin of the British Museum (Natural History) Zoology. TWELVE SOIL TESTATE AMOEBAE FROM AUSTRALIA, AFRICA, AND AUSTRIA 13. Figs 69-75 Tracheleuglypha dentate, light microscopic (Figs 69,70) and SEM-aspects (Figs 72-75) and ideal individual (Fig. 71). 69-71 Lateral and ventral views. 72-74 Apertures with differently shaped collars, x 3800, x 3900, x 4200. 75 Ventro-lateral view of specimen without distinct collar, x 1500. Scale bar divisions lOum. our population represent the type photographed in PI. 78 of Ogden & Hedley (1980). Presumably such populations should be separated at specie
. Bulletin of the British Museum (Natural History) Zoology. TWELVE SOIL TESTATE AMOEBAE FROM AUSTRALIA, AFRICA, AND AUSTRIA 13. Figs 69-75 Tracheleuglypha dentate, light microscopic (Figs 69,70) and SEM-aspects (Figs 72-75) and ideal individual (Fig. 71). 69-71 Lateral and ventral views. 72-74 Apertures with differently shaped collars, x 3800, x 3900, x 4200. 75 Ventro-lateral view of specimen without distinct collar, x 1500. Scale bar divisions lOum. our population represent the type photographed in PI. 78 of Ogden & Hedley (1980). Presumably such populations should be separated at species level. Tracheleuglypha dentata (Penard, 1890) Deflandre, 1928 Figs 69-75, Tables 1,12 BM (NH) Reg. No. Shell colourless, obovoid, circular in transverse section, composed of about 100 circular, regularly overlapping plate- lets, usually about 7 urn in diameter (often smaller in apertural region). Circular aperture terminal, usually, but not always, surrounded by chitinous collar (Figs 72-75). Coefficients of variation are between and Character (3) and diameter of shell platelets show the greatest variability (Table 12). Our measurements correlate well with those of Penard (1890, 1902), Cash et al. (1915), Thomas & Gauthier-Lievre (1959) and Rauenbusch (1987), whereas the population of Ogden & Hedley (1980) is slightly larger. A comparison of our values with the average values (1 free-living and 3 cultivated populations combined) of Ogden & Couteaux (1987) shows a high conformity, even in standard deviations. The measurements for T. acolla, given by Bonnet & Thomas (1955), also agree with ours. As already mentioned, specimens of our population may or may not have a collar. Traditionally, individuals without collar are considered as a separate species, T. acolla (Bonnet & Thomas, 1955). The transitions between individuals with and without collar are manifold and have indeed been docu- mented by numerous authors using scanning electron
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