Name: Class
Insecta: Orders Blattodea, Hempitera, Coleoptera
Geological
Time: Lower Cretaceous Late Aptian-Cenomanian (108-92 million years
ago)
Size: Hemiptera;
8 mm by 4 mm; Blattodea: 11 mm by 3 mm; Coleoptera: 4 mm by 2 mm
Location:
Esk Formation, Toogoolawah Group, Windera Creek, Murgon, Queensland, Australia
This
is a set of parts of insects from a recently discovered Triassic
formation in Australia. While they were listed as from the Aranbanga
Volcanic Group, they are definitely of sedimentary and not igneous
origin. The region is home to the Esk Trough which contains the
Esk shale, a far more likely deposit. The region is the site of
a producing gold mine, so data is not as freely dispensed as might
be the case under other circumstances. Also, due to the recent nature
of the discovery, little has as yet been published in the literature.
At any rate, insect fossils are found near Sydney in middle Triassic
sandstones, and in late Triassic shales such as this area of Queensland
and Northern Australia. Three orders are represented here. Top:
Hemilytra or wing cover of an undescribed Hemiptera. Right: Cockroach
tegmen (modified leathery wing), Order Blattodea. Left: Abdomen
of undescribed beetle (Coleoptera). The shale has preserved fine
details in each case, from the segmentation of the abdomen to venation
in the wing and cover.
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