Scientists from the University of Illinois and University of Puerto Rico have sequenced the mitochondrial genome for the Hispaniolan solenodon, a venomous mammal found only on Hispaniola. Findings of their study, published in Mitochondrial DNA, confirmed that the the species diverged from all other living mammals 78 million years ago, long before an asteroid wiped out the dinosaurs.
http://www.igb.illinois.edu/news/endangered-venomous-mammal-predates-dinosaurs’-extinction
http://www.igb.illinois.edu/news/endangered-venomous-mammal-predates-dinosaurs’-extinction