👉 The term "graptolitoidea" is a genus of marine bivalves in the family Graptolomidae. These are gastropod mollusks that have soft, waxy, spongy skeletons that give them their name - they are characterized by their elongated, spongy bodies and their ability to form complex structures like gills, which are part of their digestive system. In general, graptolitoidea is a family of marine bivalves