For 20 years, researchers snorkeled through rivers across the southern U.S., feeling along muddy bottoms for mussels. Many of the shells they pulled up looked like familiar species, but their DNA told a different story. Scientists from Shedd Aquarium, Arkansas State University, and the U.S. Geological Survey (USGS) have described five new species of freshwater mussels from rivers in the states of Missouri, Arkansas, Mississippi, Alabama, Louisiana, and Texas, in a study published in Zootaxa. Several are rare and confined to single river basins, the authors write. “Our discovery and descriptions of these new freshwater mussel species demonstrate how much we still have to learn about the biodiversity in our rivers,” Nathan Johnson, a study co-author and research biologist at the USGS Wetland and Aquatic Research Center, said in a press release. Mussels are hard to identify from their shells. For example, mussels in headwater streams tend to grow flatter shells, while the same species downstream grow rounder ones. Males and females differ as well. So the researchers turned to genetics. In many cases, they clipped a bit of tissue or took a swab, then returned the mussel alive to the river, according to the study. The team sequenced three genes and compared more than 440 shell outlines. Each major river basin turned out to hold its own genetic lineage. Researchers named the new species for where they live. The Mobile hickorynut (Obovaria sipseyensis) is named for Alabama’s Sipsey River, from a Choctaw word meaning “swamp.” It now survives only…This article was originally published on Mongabay

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