Arnoldius (Dubovikoff, 2005) AU01

AUSTRALIA: 1 worker, Queensland, Smithfield Conservation Park 16.8167° S, 145.6833° E, 70 m, 9 Mar. 2006, rainforest, sifted litter (leaf mold, rotten wood), A. Lucky #ALC339-1 [UCDC: CASENT0106155] ; 1 worker, New South Wales, Kanangra, Boyd National Park, 33°59' S, 150°07' E, 1050 m, 19 Jul. 1975, dry sclerophyll forest, under stone, P.S. Ward #PSW1000 [UCDC] ; 1 worker, Queensland, Smithfield Conservation Park, 16°49' S, 145°41' E, 70 m, 17 Aug. 2006, rainforest, ex. rotten log, P.S. Ward #PSW15681 [UCDC].

In Table 2 we compare B. enigmaticus sp. nov., B. paradoxus, Chronoxenus wroughtoni and an undescribed species of Arnoldius to data collected from a morphometric study of Palearctic Bothriomyrmex conducted by Seifert (2012). In this context, some very general observations can be made about the morphological affinities of B. enigmaticus sp. nov.: the eyes of B. enigmaticus sp. nov., relative to cephalic size are the largest in this dataset, similar to the large-eyed B. paradoxus, C. wroughtoni, and B. corsicus . The antennal scapes are short as well, a feature shared by B. paradoxus, C. wroughtoni and A. AU01. Finally, the propodeum is compact and delineated by a deep metanotal groove, much like B. paradoxus, C. wroughtoni, A. AU01, and to a lesser degree B. corsicsus .