Bullinularia foissneri
B. foissneri, scale bar 40 µm (from Meisterfeld, 2008)

Bullinularia foissneri Meisterfeld, 2008

Diagnosis: The shape of this species is variable. The test is in ventral view oval or egg-shaped, rarely round, the ventral face is always more or less bellied! The aperture is close to the front end and lies at the bottom of a deep furrow. The ventral apertural lip is steeply invaginated, its forward edge is curved and thickened. The dorsal lip only partly covers the aperture. The edge is either bent forward or straight. Pores are always present, easily visible as brighter spots, but restricted to the dorsal lip and the apex of the test. In contrast to B. indica they never occur on the belly of the shell. In lightmicroscopical observation at higher apertures the lateral margins of the apertural furrow are out of focus.
In lateral view the tests are high,they sometimes resemble certain Hoogenraadia species, for example H. cryptostoma. The test is composed of a mixture of mineral particles of different size. On the ventral face these elements are smaller. The overall colour of the shells is light brownish but at a closer view one finds a mosaic of almost transparent as well as completely dark or brown particles. The cement between the mineral particles is dark. The surface of the test around the pseudostome and the apex is covered by smooth organic cement, all other parts are more or less rough due to larger grains of sand. The nucleus is large (about 35 µm across), from the ovular type with numerous small nucleoli.

Geographical distribution: Until now B. foissneri is only known from the type location, but Hoogenraad & De Groot (1948) have figured in their work on the testate amoebae of New Zealand an egg-shaped Bullinularia which they considered to be amonstrous form of B. indica. Their Fig. 16 resembles B. foissneri and this could be a hint that the new species is also present in New Zealand.A comparison with almost all published images of Bullinularia shows that a comparable Bullinularia had never been figured and this makes it likely that B. foissneri is an endemic of the Australis. After B. indica and B. gracilis it is the third species known from Australia.

All from Meisterfeld, 2008

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