Summary ²

Palaeoheterodonta is a subclass of bivalve molluscs. It contains the extant orders Unionoida (freshwater mussels) and Trigonioida. They are distinguished by having the two halves of the shell be of equal size and shape, but by having the hinge teeth be in a single row, rather than separated into two groups, as they are in the clams and cockles.

Sources and Credits

1. (c) James St. John, some rights reserved (CC BY), https://www.flickr.com/photos/jsjgeology/28518403791/
2. (c) Wikipedia, some rights reserved (CC BY-SA), https://en.wikipedia.org/wiki/Palaeoheterodonta

More Info

• iNat taxon page
• Biodiversity Heritage Library
• BOLD Systems BIN search
• Global Biodiversity Information Facility (GBIF)
• World Register of Marine Species

iNat Map