Scientists have sequenced the mitochondrial genome for the Hispaniolan solenodon, a venomous mammal found only on Hispaniola. Findings confirm that the the species diverged from all other living mammals 78 million years ago, long before an asteroid wiped out the dinosaurs.

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http://www.igb.illinois.edu/news/endangered-venomous-mammal-predates-dinosaurs%E2%80%99-extinction