Both specimens are incomplete, but one extends to one meter long, making it one of the largest Ediacaran macrofossils.

Evidence suggests that F. grandis may have been tethered to the seafloor and used these leaflets to "filter feed", or live off nutrients provided by a current.

[4] The Frondophyllas, like many other fossils found in the Avalon Peninsula, was preserved by solidified volcanic ash.

Evidence suggests that during this preservation event, the volcanic ash created a mold of the organism when it fell onto the sea floor.

[4][2] Found in the Avalon Peninsula of Newfoundland, Canada, Frondophyllas grandis was discovered in the Briscal Formation in Bristy Cove.