Solenodons (meaning "slotted-tooth") are venomous, nocturnal, burrowing, insectivorous mammals belonging to the family Solenodontidae. Only one genus, Solenodon, is known, although a few other genera were erected at one time and are now regarded as junior synonyms. Solenodontidae is interesting to phylogenetics researchers because of its retention of primitive mammal characteristics; their species resemble very closely those that lived near the end of the age of the dinosaurs. In 2016, soldenodons were confirmed by genetic analysis as predating the mass extinction of the dinosaurs. They are one of two families of Caribbean soricomorphs; it is uncertain whether the other family, Nesophontidae, which became extinct during the Holocene, was closely related to solenodons.