Bullinularia gracilis

This name was mentioned in Cynar and Sieburth in 1986, but we have been unable to track down a description.

Testate amoeba, the lorica is yellow or brown, circular in broad view and hemispherical in lateral view. It is composed mainly of small sand and grains. The aperture is circular and bordered by an arrangement of small particles embedded in an organic matrix. Length of shell 20-72 microns, breadth of shell 37-45 microns, diameter of aperture 10-42 microns.

Lorica elongate, varginate or subcylindrical, straight, five or six times as long as broad, sometimes rounded, in other instances more or less attenuate or even pendunculate posteriorly, the anterior margin slightly everted, somewhat constricted beneath this region; contained animalcule subcylindrical elongate, occupying from one-fourth to one-third of the total length of the lorica; two contractile vacuoles, posteriorly situated. Length of lorica 32-51 microns; the cell body is 13-25.5 microns long.

Length 123-177 microns, diameter at mouth 34-38 microns, greatest diameter 38-44 microns. It is almost cylindrical, widening slightly from the mouth to the lower third and then narrowing to a bluntly conical point.