Abstract
Tasmaniosoma armatum Verhoeff, 1936 and T. orientale Mesibov, 2010 are parapatric in northeast Tasmania, Australia. The parapatric boundary is ca 50 km long and mainly follows streamlines. Three sections of the boundary were intensively sampled. Two gonopod variants of T. orientale also appear to be parapatric.
Highlights
The endemic Tasmanian dalodesmid genus Tasmaniosoma Verhoeff, 1936 currently contains 22 species, some of which are distributed in mosaic parapatry
The T. armatum and T. orientale distributions meet in a zone ca 50 km long running southeast from the Ben Lomond area at ca 700 m a.s.l. to the lower Swan River valley north of Swansea at ca 30 m a.s.l. (Fig. 3B)
Most of the native forest and woodland has long been cleared for farming in what might have been the parapatric zone in pre-European times, eliminating Tasmaniosoma populations
Summary
The endemic Tasmanian dalodesmid genus Tasmaniosoma Verhoeff, 1936 currently contains 22 species (http://www.millibase.org/aphia.php?p=taxdetails&id=892720 accessed 2019-07-03), some of which are distributed in mosaic parapatry. In a previous publication I documented a parapatric boundary ca 230 km long between T. compitale Mesibov, 2010 and T. hickmanorum Mesibov, 2010 in northwest Tasmania (Mesibov 2011). I document sections of a parapatric boundary ca 50 km long in eastern Tasmania between T. armatum Verhoeff, 1936 and T. orientale Mesibov, 2010. While the compitale/hickmanorum boundary crosses numerous streams and vegetation ecotones, the well-sampled sections of the armatum/orientale boundary mainly follow streamlines.
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