This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A term applied to large animals, not quite large enough to be considered megafauna but larger than microfauna. Some include larger species of insects and annelids in this group.

"Small marine animals called macrofauna -- snails, worms, clams, and other creatures no bigger than a pencil eraser -- live and feed in the seafloor sediment."

macrocarpa   

macrofaunal