Trionychia is a superfamily of . There are 32 species of Trionychia, in 14 genera and 2 families. This superfamily has been around since the cretaceous period. They are omnivores. Reproduction is oviparous.
Definition: The number of fossil occurrences in the Paleobiology Database (https://paleobiodb.org) that are identified as belonging to a particular taxon or any of its subtaxa.
Definition: position of an organism in a food web. May be described verbally with descriptors including primary producer, herbivore or carnivore. If described numerically, 1 indicates a primary producer, 2 a herbivore, and so on up the food web.