Up front. A ‘must watch’ for anyone “conscious” or with friends or family is Bill Mollison’s fury rant – http://www.vankalpermaculture.org/2005-bill-mollison-croatia-interview-transcript/ . In 2000 I visited Bill and we talked about Tassie earthworms, casts of thousands, organic farming, cabbages & kings, etc….
Suggested citation of Tasmanian Earthworm monograph is:-
Blakemore, R.J. (2000). Tasmanian Earthworms. CD-ROM. ISBN 0646410881. Libraries Australia ID 22242539. Publisher: VermEcology, Canberra. Pgs. 568 plus 233 Figs. (In original format 800 pp).
There is a natural richness in Tasmania’s known 200 natives plus 30 or so exotics, e.g. when I did a week’s survey of Lake Pedder I found 21 species (spp.), a mix of new & known, native & exotic; but not the extinct Hypolimnus pedderensis worm – www.biodiversitylibrary.org/page/57547343#page/1/mode/1up. Tassie’s Macquarie Island has 3 species (www.annelida.net/earthworm/Subantarctic/Subantarctic%20Species.pdf).
For its size (brilliantmaps.com/largest-islands/) Tasmania is easily the most diverse with about the same total known taxa as the whole of North America (200+ species) or the whole of NZ (~245 spp.). For islands of similar size: Sri Lanka has about 62 spp. (www.annelida.net/earthworm/Indian.pdf); Cuba 45 spp. (www.annelida.net/earthworm/Cuban%20earthworms.pdf); Ireland, Iceland and Hokkaido about 18 spp. each (www.annelida.net/earthworm/Britain%20&%20Ireland.pdf ; www.annelida.net/earthworm/Japanese%20Earthworms/Japanese%20Earthworms.pdf ; www.annelida.net/earthworm/Greenland%20and%20Iceland%20earthworms.pdf). Frozen areas or those already turned to desert have fewest spp.