 In a 1999 review of recent extinctions in mammals, Ross MacPhee and C. Flemming reported that "M. audreyae" had been recovered from a locality on Barbuda known as Darby Sink, which had been radiocarbon dated to around 1200 BCE.They also stated that "M. audreyae" and ""Ekbletomys"" may in fact be identical.However, in 2009 Samuel Turvey suggested that two different rice rats were in fact present in material from Barbuda, which would imply that "M. audreyae" is a valid species.