Helicoidea is a superfamily of Gastropoda. There are 2727 species of Helicoidea, in 481 genera and 17 families. This superfamily has been around since the thanetian age. It includes groups like Helicodontidae, Trichodiscinidae, and Geomitridae. Dead Helicoidea form shallow marine sediments. They have sexual reproduction.
EOL has data for 21 attributes, including: