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Sidymella hirsuta (Koch, 1873) Hairy Crab Spider

A distinct species of Sidymella not uncommon in Brisbane but rarely noticed due to its camouflage on hairy plants. Like other Sidymella species the abdomen is triangular in shape. Hawkeswood reports that the male has a narower abdomen and is smaller (body length 4-5mm) than the female (body length 6-7mm). Colour can be variable, and may adjust to the colours of the plant the spider is living on.

From side

Sidymella hirsuta
Photo: Robert Whyte

From above, male


Sidymella hirsuta
Photo: Robert Whyte

Female, from above


This specimen, body length about 3.5mm collected behind the SOWN shed on Paten Creek. It resembles the hairy Sidymella sp in photo 6 on p99 in Mascord 1980, who was evidently cautious in attributing the name S. hirsuta to his specimen, although other guides (Clyne, 1969) show S. hirsuta with variation. The darker ones would be more mature and not freshly moulted.

Sidymella sp
Photo: Robert Whyte

Female, underneath


Sidymella sp
Photo: Robert Whyte

From above


Sidymella hirsuta
Photo: Robert Whyte

From above


Sidymella hirsuta
Photo: Robert Whyte

Male palp front


Sidymella hirsuta
Photo: Robert Whyte

Male palp side


Sidymella hirsuta
Photo: Robert Whyte

Male palp back


Sidymella hirsuta
Photo: Robert Whyte

From above

Sidymella hirsuta
Photo: Robert Whyte

Female


Sidymella hirsuta
Photo: Robert Whyte

Female epigyne


Sidymella hirsuta
Photo: Robert Whyte

Mite on Sidymella - the Sidymella


Sidymella hirsuta
Photo: Robert Whyte

Mite on Sidymella


Sidymella hirsuta
Photo: Robert Whyte

Mite on Sidymella


Owen Seeman at QM has let us know this is an Oribatid mite - they are quite amazing. Can you imagine: "Oribatida are one of the most numerically dominant arthropod groups in the organic parts of most soils, where their densities can reach several hundred thousand individuals per square meter. Undisturbed soils can easily yield examples of 50-100 species."

Sidymella hirsuta
Photo: Robert Whyte