Hackled-orb web, triangle-web, single-line web spiders

Family Uloboridae

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Uloborus barbipes

Uloborid spiders are unusual in having no poison glands. They rely completely on wrapping their prey in silk. The spider belongs to the cribellate spider group because they comb the silk to fluffy wool.
The web they construct is an incomplete wheel web and looks a little clumsy and asymmetrical. The web is usually built horizontal. Some species use a single line to catch prey.
Special features of the web are the hub, which is closely and beautifully meshed, and the ribboned decorations or stabilmenta that ornament the orb and possibly add to its strength.
Different variations are observed, V-shaped, four ribbons forming a cross, broken or complete circles around the hub.
In position the spider lies stretched out beneath the hub of her web, her legs directed forward and backward forming a bridge between the stabilmenta and make a complete band across the snare. As she hangs there, she often resembles a stick or a leaf.
When the eggs are laid the elongate sacs are laid in a row across the web and then aligns her long body so that she becomes almost indistinguishable from them.
The Uloboridae can be found in large social groups together in hollow trees, under houses or beneath rock ledges. Their snares may be tangles together with the webs of the other spiders.
The spiders rarely exceed a body length of 12 mm and are distinguished by their very long, often curved, forelegs.

In Australia six different genera can be found with 13 described species.


Genus Miagrammopes


Only four eyes instead of the usual eight eyes
All species of this genus have been observed to spin a usually horizontal single line or cribellar silk. From this line diagonal or vertical captures line are constructed . They actively monitor and jerk their capture line to catch prey.
The spider's shape makes it difficult to find it in the schrub.
It's shape is also remarkable because it lost four of its eight eyes.
Females constructs cylidrical egg-sacs consisting of two columns of eggs and holds it until spiderlings emerge and disperse.
Pictures by Robert Whyte

Miagrammopes ZZ530

 

Miagrammopes ZZ577 Miagrammopes ZZ530
Miagrammopes ZZ530 Miagrammopes ZZ577

Genus Philopenella

Philoponella variabilis Philoponella variabilis
Philoponella variabilis female Philoponella variabilis male
Philoponella ZZ576 Philoponella ZZ581
Philoponella ZZ576 Philoponella ZZ581
Philoponella ZZ627 Pictures by Robert Whyte
Philoponella ZZ627  

Genus Uloborus


Uloboris congregabilis male Uloboris congregabilis female

Uloboris congregabilis female
Uloboris congregabilis female
Uloboris barbipesfemale  
Uloborus barbipes in her horizontal orb web Uloborus barbipes
Uloborus plumipes found all over world in green houses (cosmolitian) Uloborus plumipes note the single-line web
Uloborus ZZ625
Uloborus ZZ625 QLD  
Uloborus ZZ625 Uloborus ZZ625
Uloborus ZZ625 Uloborus ZZ625
Uloborus ZZ625
Uloborus ZZ625 Uloborus ZZ625 detail of the head
 
  Uloborus ZZ579 QLD
Uloborus ZZ197
Uloborus ZZ197 QLD Uloborus ZZ197 QLD

Genus Zosis

Zosis geniculata (Gray house spider) Zosis geniculata egg-sac
Zosis geniculata The curious shiny wetty sac with caught prey
 
Zosis geniculatus with prey  

 

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Ed Nieuwenhuys, 25 March 2012
4 January 2009
Ronald Loggen 1997/98

Copyright ã 1997/2012