Philodromid crab spider

Philodromid crab spiders

Scientific classification
Kingdom:Animalia
Phylum:Arthropoda
Class:Arachnida
Order:Araneae
Family:Philodromidae
Genera

Ebo
Philodromus
Thanatus
Tibellus

The Philodromid crab spiders (family Philodromidae), used to belong to the family Thomisidae which are considered true crab spiders.

However, studies have shown that these two spider groups, though similar, are not as closely related as previously thought. Unlike thomisids, philodromids tend to have few true setae (hairs or spines) on their bodies. They also lack the congruent eye tubercles of some thomisids. The second legs are usually the longer of the four pairs of walking legs and in the genus Ebo this is quite extreme, with the second pair of legs in some species twice as long as the first pair.

The most common genus is Philodromus which, like Ebo is widespread. Other common genera include the elongate grass-dwelling Tibellus and the widespread Thanatus, which includes the widely distributed Holarctic house crab spider Thanatus vulgaris. This species commonly captures flies on and in buildings.

The family contains over 500 species in nearly 30 genera. Most are dull colored- brown, gray, yellowish or mottled, and seldom reach above 10 mm in body length. Most have a leaf-like cardiac mark on the anterior dorsal abdomen. None of the species build webs, but they do use silk for draglines and for egg sacs.

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