Saturday, May 19, 2018

[Arachnida • 2018] Conservation Systematics of the Shield-backed Trapdoor Spiders of the nigrum-group (Mygalomorphae, Idiopidae, Idiosoma): Integrative Taxonomy Reveals A Diverse and Threatened Fauna from south-western Australia


Figures 1–12. Live habitus images of shield-backed trapdoor spiders of the Idiosoma nigrum-group.
 1–3 Female
 I. nigrum Main, 1952 (WAM T132737) from Minnivale Nature Reserve (Western Australia) 6 Male I. sigillatum (WAM T136936) from Wangara (Western Australia)

7 Female I. jarrah (WAM T136937) from Darlington (Western Australia) 8 Female I. mcclementsorum sp. n. (WAM T139469) from Julimar State Forest (Western Australia) 9 Female I. kopejtkaorum sp. n. from Charles Darwin Nature Reserve (Western Australia)

 10 Female 
I. schoknechtorum sp. n. (WAM T140765) from SW. of York (Western Australia) 11–12 Female I. arenaceum sp. n. (WAM T141118) from Kalbarri National Park (Western Australia).


 Images 1–3, 6, 7, 9–12 by M. Harvey; 4 by Greg Anderson, used with permission; 5, 8 by M. Rix.
in Rix, Huey, Cooper, et al., 2018.
   DOI: 10.3897/zookeys.756.24397

Abstract
The aganippine shield-backed trapdoor spiders of the monophyletic nigrum-group of Idiosoma Ausserer s. l. are revised, and 15 new species are described from Western Australia and the Eyre Peninsula of South Australia: I. arenaceum Rix & Harvey, sp. n., I. corrugatum Rix & Harvey, sp. n., I. clypeatum Rix & Harvey, sp. n., I. dandaragan Rix & Harvey, sp. n., I. formosum Rix & Harvey, sp. n., I. gardneri Rix & Harvey, sp. n., i. gutharuka Rix & Harvey, sp. n., I. incomptum Rix & Harvey, sp. n., I. intermedium Rix & Harvey, sp. n., I. jarrah Rix & Harvey, sp. n., I. kopejtkaorum Rix & Harvey, sp. n., I. kwongan Rix & Harvey, sp. n., I. mcclementsorum Rix & Harvey, sp. n., I. mcnamarai Rix & Harvey, sp. n., and I. schoknechtorum Rix & Harvey, sp. n. Two previously described species from south-western Western Australia, I. nigrum Main, 1952 and I. sigillatum (O. P.-Cambridge, 1870), are re-illustrated and re-diagnosed, and complementary molecular data for 14 species and seven genes are analysed with Bayesian methods. Members of the nigrum-group are of long-standing conservation significance, and I. nigrum is the only spider in Australia to be afforded threatened species status under both State and Commonwealth legislation. Two other species, I. formosum Rix & Harvey, sp. n. and I. kopejtkaorum Rix & Harvey, sp. n., are also formally listed as Endangered under Western Australian State legislation. Here we significantly relimit I. nigrum to include only those populations from the central and central-western Wheatbelt bioregion, and further document the known diversity and conservation status of all known species.

Keywords: biodiversity hotspot, conservation biology, illustrated key, subfamily Arbanitinae, taxonomy, tribe Aganippini


Figures 1–12. Live habitus images of shield-backed trapdoor spiders of the Idiosoma nigrum-group.

1–3 Female I. nigrum Main, 1952 (WAM T132737) from Minnivale Nature Reserve (Western Australia)

4 Female Isigillatum (O. P.-Cambridge, 1870) (WAM T129191) from Karnup, Perth (Western Australia) 5 Male I. sigillatum (WAM T132564) from Crawley, Perth (Western Australia) 6 Male I. sigillatum (WAM T136936) from Wangara (Western Australia)

7 Female I. jarrah (WAM T136937) from Darlington (Western Australia) 8 Female I. mcclementsorum sp. n. (WAM T139469) from Julimar State Forest (Western Australia) 9 Female I. kopejtkaorum sp. n. from Charles Darwin Nature Reserve (Western Australia)

10 Female I. schoknechtorum sp. n. (WAM T140765) from SW. of York (Western Australia) 11–12 Female I. arenaceum sp. n. (WAM T141118) from Kalbarri National Park (Western Australia).

Images 1–3, 6, 7, 9–12 by M. Harvey; 4 by Greg Anderson, used with permission; 5, 8 by M. Rix.

Figures 1–12. Live habitus images of shield-backed trapdoor spiders of the Idiosoma nigrum-group. 

7 Female I. jarrah (WAM T136937) from Darlington (Western Australia) 8 Female I. mcclementsorum sp. n. (WAM T139469) from Julimar State Forest (Western Australia) 9 Female I. kopejtkaorum sp. n. from Charles Darwin Nature Reserve (Western Australia) 10 Female I. schoknechtorum sp. n. (WAM T140765) from SW. of York (Western Australia) 11–12 Female I. arenaceum sp. n. (WAM T141118) from Kalbarri National Park (Western Australia).
 Images 7, 9–12 by M. Harvey; 8 by M. Rix.


 Michael G. Rix, Joel A. Huey, Steven J.B. Cooper, Andrew D. Austin and Mark S. Harvey. 2018. Conservation Systematics of the Shield-backed Trapdoor Spiders of the nigrum-group (Mygalomorphae, Idiopidae, Idiosoma): Integrative Taxonomy Reveals A Diverse and Threatened Fauna from south-western Australia. ZooKeys. 756: 1-121.  DOI: 10.3897/zookeys.756.24397

Fourteen new trapdoor spider species described in WA - Australian Geographic  australiangeographic.com.au/news/2018/05/fourteen-new-trapdoor-spider-species-described-in-wa via @ausgeo

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