Crooked Island Hutia (Geocapromys ingrahami ssp. irrectus)
The Bahaman Hutia (Geocapromys ingrahami (J. A. Allen)) is a species of middle-sized rodent that is endemic to the Bahamas, or at least to the islands that are part of the so-called Great Bahama Bank.
The species was believed to be extinct, but a very small population was rediscovered in 1966 on a likewise very small island named East Plana Cay, this was assigned to the nominate form and in 1973, some of these animals were released on two additional islands, Little Wax Cay and Warderick Wells.
Based on DNA studies it is now known that the animals on East Plana Cay in fact did not constitute the last surviving wild population but one that was introduced in pre-Columbian times by the people of the Lucayan culture, the first human inhabitants of the Bahamas. 
Subfossil remains of this species were found on many of the larger islands, including Abaco as well as Crooked Island, Eleuthera, Exuma and Long Island; these forms differed from the alleged nominate form by their cranial characters and thus were described as two distinct subspecies: Geocapromys ingrahami ssp. abacoensis Lawrence (from Abaco Island) and Geocapromys ingrahami ssp. irrectus (from the remaining islands); the form from Abaco Island, however, is now known to have also just been introduced in prehistoric times, thus has never been a distinct subspecies. 
The animals that inhabited Crooked Island, Eleuthera, Exuma and Long Island on the other hand, appear to be non-monophyletic, thus likewise do not represent a distinct subspecies but either more than one or none at all.
The above-mentioned differences in the cranial characters may in fact just be the consequence of resource availability – animals on larger islands may have become larger because they had access to larger resources …. 
The Bahamian Hutia, once believed to be extinct, then rediscovered in 1966, may never had have any subspecies after all. This question is not yet answered – I will mention this species here only fro the sake of completness and because it constitutes a very interesting case.
 B. N. Lawrence: Geocapromys from the Bahamas. Occasional papers of the Boston Society of Natural History 8: 189-196. 1934
 Jessica A. Oswald; Julie M. Allen; Michelle J. LeFebvre; Brian J. Stucky; Ryan A. Folk; Nancy A. Albury; Gary S. Morgan; Robert P. Guralnick; David W. Steadman: Ancient DNA and high-resolution chronometry reveal a long-term human role in the historical diversity and biogeography of the Bahamian hutia. Scientific Reports 10: 1373. 2020