I have learned today (17 November, 2014) that this might be a burrow of a different tarantula species. Along with a huge number of other similar burrows, this was in grassland near the coast on the island of Nevis, West Indies
<a href="//commons.wikimedia.org/wiki/User:Invertzoo" title="User:Invertzoo">Invertzoo</a>
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<span class="int-own-work" lang="en">Own work</span>