. Bulletin of the British Museum (Natural History) Zoology. TWELVE SOIL TESTATE AMOEBAE FROM AUSTRALIA, AFRICA, AND AUSTRIA. Figs 33-39 Nebela tubulate, light microscopic (Figs 33-35) and SEM-aspects (Figs 37-39) and ideal individual (Fig. 36). 33-35 Broad lateral, narrow lateral and ventral view. 36 Broad and narrow lateral view. 37,38 Broad and narrow lateral view, x 1100, x 1200. 39 Aperture, x 2500. Scale bar divisions 10 urn. The drawings in Penard (1890, PI. VIII, Figs 79,80,84,86,87) clearly show individuals having peculiar spine-like structures in the aboral region and are even mention
. Bulletin of the British Museum (Natural History) Zoology. TWELVE SOIL TESTATE AMOEBAE FROM AUSTRALIA, AFRICA, AND AUSTRIA. Figs 33-39 Nebela tubulate, light microscopic (Figs 33-35) and SEM-aspects (Figs 37-39) and ideal individual (Fig. 36). 33-35 Broad lateral, narrow lateral and ventral view. 36 Broad and narrow lateral view. 37,38 Broad and narrow lateral view, x 1100, x 1200. 39 Aperture, x 2500. Scale bar divisions 10 urn. The drawings in Penard (1890, PI. VIII, Figs 79,80,84,86,87) clearly show individuals having peculiar spine-like structures in the aboral region and are even mentioned in his descrip- tion. Hoogenraad & De Groot (1940) also state 'eigentum- liche dornartige Fortsatze' for H. petricola, and Penard (1890) assumes very narrow idiosomes erected on the shell surface for H. picta. This suggestion is now confirmed by means of scanning electron microscopy. No other study describing such platelets is known to us. The paper by Couteaux & Munsch (1978, PI. Ill, Fig. 3), however, includes a scanning electron micrograph of a specimen designated as Placocista lens. We suggest that it is a Heleopera with spine- like siliceous platelets. (Unlike to Heleopera, the genus Placocista is an euglyphid taxon, having filose pseudopodia and shells with regularly arranged, self-made platelets). Presumably, all species of the genus Heleopera have the ability to erect platelets. For detailed ecological data see Bonnet (1989/?). Nebela tubulata Brown, 1910 Figs 33-39, Tables 1,7 BM (NH) Reg. No. Shell colourless, flask-like with distinctly separated, parallel- sided neck, slightly compressed, fragile, composed of different sized circular and elliptic platelets from other Table 7. Morphometric characterization of Nebela tubulata. All measurements in urn. Character X M SD SE cv Min Max n (1) 57 64 13 (2) 28 38 13 (3) 20 26 5 (4) 13 16 13 (5)
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