Gromia is a widespread genus of marine and freshwater
amoeboids, closely resembling some
foraminiferans. It produces an organic
test, which is ovoid or lobed and may exceed one millimetre in size; this resembles a small grape, in that its centre is fluid-filled but lacks organic matter, which is concentrated in its translucent test and underlying sediment, making the organism almost neutrally buoyant. Filose pseudopods emerge from a single opening in the test. They branch and may merge again, but unlike the pseudopods of true foraminiferans they are not granular and rarely form a network. The life-cycle involves both asexual and sexual reproduction, and at certain stages motile cells with two
flagella are produced.