Certesella australis Vucetich, 1973
Nebela australis Vucetich, 1973
Diagnosis: Shell is elongated-pyriform, gradually tapering toward the aperture, without neck. Test is laterally compressed with the distinct keel covering all the lateral margin of the test. According to original description two little pores on the lateral margin are present but very difficult to observe. On the 2/3 part of the test there are two lateral depressions are situated with the large central pores connected to each other with internal tube. Test is yellowish-brownish, composed of circular or oval shell plates, covered with thick organic layer, which are sometimes hard to observe. This species is the biggest one in the genus. Aperture is curved surrounded with thick organic lip, One sole line of the teeth (around 10) situated in parallel to the board of the aperture, giving punctuated impression.
Measurements: L= 199.5-277.5 μm, B=119-140 μm. Aperture 40-46 μm wide.
Ecology: Sphagnum mosses, wet green mosses. General distribution: Argentina (Thierra del Fuego). Note. This is very rare species, probably with restricted distribution. Till now it was found only in different localities of Thierra del Fuego (Van Bellen et al. 2014).
Van Bellen, S., Mauquoy, D., Payne, R. J., Roland, T. P., Daley, T. J., Hughes, P. D. M., Loader, N.J., Alayne Street-Perrott, F., Rice, E.M. and Pancotto, V.N.A. 2014. Testate amoebae as a proxy for reconstructing Holocene water table dynamics in southern Patagonian peat bogs. Journ. Quatern. Sc. 29 (5) 463–474