Image of Paphies donacina (Spengler 1793)

Description:

"These 3 Tuatua have byssus (beard), most on the smallest, least on the biggest. Also on Large trough shells, Triangle shell, and Green-lipped mussel. Often see it on mussels, not so often on the others. ""All bivalves have the ability to secrete sticky threads known as byssal threads. However, most bivalves tend to use them only during infancy when they are small and require stabilization"" http://palaeo.gly.bris.ac.uk/palaeofiles/fossilgroups/bivalvia/modes.html"