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Although it has been claimed that they lack venom glands and ducts, which almost all other spiders have, [1] subsequent works have demonstrated that at least some, possibly all, do in fact have both the glands and ducts. [17] All Mesothelae have eight spinnerets in four pairs. Like mygalomorph spiders, they have two pairs of book lungs. [18]
They are medium to large spiders. They have downward pointing, daggerlike chelicerae . [ 10 ] Like other members of the suborder Mesothelae, and unlike all other extant spiders, they have a segmented series of plates ( tergites ) on the upper surface of all segments of the abdomen and their spinnerets are placed in the middle of the underside ...
Most of these early segmented fossil spiders from the Coal Measures of Europe and North America probably belonged to the Mesothelae, or something very similar, a group of spiders with the spinnerets placed underneath the middle of the abdomen, rather than at the end as in modern spiders. They were probably ground-dwelling predators, living in ...
Trapdoor spider is a common name that is used to refer to various spiders from several different groups that create burrows with a silk-hinged trapdoor to help them ambush prey. Several families within the infraorder Mygalomorphae contain trapdoor spiders: Actinopodidae, a family otherwise known as 'mouse-spiders', in South America and Australia
The family Liphistiidae was erected by Tamerlan Thorell in 1869 for the genus Liphistius.Initially, it was the only family placed in the suborder Mesothelae. In 1923, Kyukichi Kishida described a new genus, Heptathela, and suggested creating two tribes within the Liphistiidae corresponding to the genera Liphistius and Heptathela. [4]
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This group of spiders comprises mostly heavy-bodied, stout-legged spiders including tarantulas, Australian funnel-web spiders, mouse spiders, and various families of spiders commonly called trapdoor spiders. Like the "primitive" suborder of spiders Mesothelae, they have two pairs of book lungs, and downward-pointing chelicerae. Because of this ...
Walking with Monsters – Life Before Dinosaurs, marketed as Before the Dinosaurs – Walking with Monsters in North America, is a 2005 three-part nature documentary television miniseries created by Impossible Pictures and produced by the BBC Studios Science Unit, [2] the Discovery Channel, ProSieben and France 3. [3]