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Arthropods, with about 84 percent of all known species of animals on Earth, make up the largest phylum in the animal kingdom, and include spiders, mites, insects, centipedes, and millipedes.  The distinguishing feature of arthropods is the presence of a jointed skeletal covering composed of chitin

Bull ant (Genus: Myrmecia)
Aka: bull ants, inch ants, sergeant ants, jumper ants or jumping jack (although jack jumper only applies to members of the M. pilosula species group)
Bull ants are probably best known for their aggressive behaviour and powerful stings. There are about 90 species of bull ants in Australia with diverse behaviours and life cycles. –
They are large ants that can grow up to 40 mm. They are characterised by large eyes and long, slender mandibles and a potent venom-loaded sting. They have superior vision, able to track and even follow intruders from a distance of 1 metre. The venom of these ants has the potential to induce anaphylactic shock in allergic sting victims. 
Southern or Wood Scorpion (Cercophonius squama)
Cercophonius squama is a widespread south-eastern Australian. The body length, including the tail, ranges from 25–40 mm, and the body pattern is variegated, consisting of patches of different shades of brown on a lighter background. It lives in burrows under plant litter on the ground or under the bark of standing trees, preferring eucalypts.
Cercophonius squama feeds on small invertebrates and can live for more than three years
Female scorpions are more heavily built than males, with shorter tails.
Australian scorpions stings cause inflammation and pain for several hours. Apply a cold pack and to seek medical aid if pain persists.
Southern or Wood Scorpion (Cercophonius squama)
Christmas Beetle (Anoplognathus porosus)
Anoplognathus porosus is about 25 mm long and creamy-gold with short, dark parallel grooves on the wing-covers.
There are 36 species of Anoplognathus, all but one unique to Australia. Christmas beetle were given their name because the adults emerge around Christmas time. The female beetles lay eggs in soil or compost in spring and early summer. Larvae live in the soil. They feed on decaying organic matter or roots. Adult beetles emerge from the soil during the early to mid summer, hence their common name Christmas beetle. The adults are mostly active at night, and feed on eucalypt leaves.
Passalid Beetle (Genus: Pharochilus)
Passalids are large shiny black beetles up to several centimetres long, and have a short horn in the centre of their head. The wing covers are deeply grooved. The passalid beetle larvae have only 2 visible sets of legs – the hind set are shortened to rub against the middle pair of legs to produce sound (stridulation). The adult passalids stridulate by moving the wings against the abdomen.
In bushland passalids are important decomposers. They live in rotting wood where the adult chews through the wood, digesting it in their gut and gradually returning the wood fragments to the soil. The adults tend their young larvae, chewing the wood and feeding the larvae the pre-digested wood. 
Passalid Beetle (Genus: Pharochilus)
Cicada (Cyclochila australasiae)
Cicada are one of Australia's most familiar insects and one of the loudest insects in the world. The song of male cicadas made with their their tymbals, (drum-like organs found in their abdomens) is a feature of summer in much of eastern Australia. 

Yellow Monday Cicada

Diverse colour forms are seen amongst cicadas, the most common being the green variety known as Green Grocer. Cicadas get their colour from two colour pigments controlled by genes. These colours are blue and yellow together making green. Rarely only one gene is functional and its own colour is then displayed. When neither gene works, the cicada is brown. The various colour forms have different vernacular names;
Yellow Monday for the yellow morph; Chocolate Soldier for the rare dark tan form; and Blue Moon for the rare turquoise form.

Yellow Monday Cicada (Cyclochila australasiae)
St Andrew's Cross Spider – female (Argiope Keyerlingi)
St Andrew's Cross Spiders are easily recognized by the pattern on their body and their webs. They build an orb web, in the middle they put four thickened zigzag strips in the shape of a cross of 'X'. The spider then hangs head down with its legs pairs together over the cross.. Adult females build vertical orb web about 1m in diameters and about 1-2 meters above ground.
The sexes are easily distinguished. Adult females grow to 15mm in body length. The abdomen is flat oval shaped with transverse white, yellow and reddish-brown stripes. The thorax and head are brownish-silver under sun light. Adult male St Andrew's Cross spiders are much smaller. They are dull brown in colour and with no pattern on the abdomen.
This spider is rather timid and non-aggressive
Yellow Monday Cicada (Cyclochila australasiae)

Crane Flies (aka as Daddy Long Leg Flies)

Crane flies or daddy-long-legs flies belong to the family Tipulidae and while they resemble large mosquitoes with long slender legs and wings they are harmless and do not bite. They can be found in moist environments throughout Australia in urban areas and forests.
Their life cycle varies depending on species and environmental conditions.
Crane Fly larvae live can live for up to a year and feed on decomposing vegetable matter. They may be fully aquatic or live in moist soil or decomposing matter.
Adult Crane Flies on the other hand live for only a few days or weeks and while they drink they do not feed

Bull ant (Genus: Myrmecia)
Bull ant (Genus...
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Christmas Beetle (Genus: Anoplognathus)
Christmas Beetl...
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Common Passalid Beetle (Genus: Pharochilus)
Common Passalid...
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Cicada (Cyclochila australasiae)
Cicada (Cycloch...
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Close up of Yellow Monday
Close up of Yel...
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St Andrew’s Cross Spider – (Argiope Keyerlingi)
St Andrew’s Cro...
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Crane Flies (Tipulidae)
Crane Flies (Ti...
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