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The chelicerae consist of a base segment, sometimes called the "paturon", that articulates with the cephalothorax (or prosoma) and a fang portion that articulates with the base segment. [2] Almost all spiders have venom glands and can inject the venom through openings near the tips of their fangs when biting prey.
Most spiders possess venom, which is injected into prey (or defensively, when the spider feels threatened) through the fangs of the chelicerae. Male spiders have specialized pedipalps that are used to transfer sperm to the female during mating. Many species of spiders exhibit a great deal of sexual dimorphism. [1]
The Mygalomorphae, which first appeared in the Triassic period, [96] are generally heavily built and ″hairy″, with large, robust chelicerae and fangs (technically, spiders do not have true hairs, but rather setae). [114] [105] Well-known examples include tarantulas, ctenizid trapdoor spiders and the Australasian funnel-web spiders. [13]
Spider behavior refers to the range of behaviors and activities performed by spiders. Spiders are air-breathing arthropods that have eight legs and chelicerae with fangs that inject venom . They are the largest order of arachnids and rank seventh in total species diversity among all other groups of organisms [ 1 ] which is reflected in their ...
Masteria petrunkevitchi eye pattern. The family Dipluridae, known as curtain-web spiders (or confusingly as funnel-web tarantulas, a name shared with other distantly related families [2]) are a group of spiders in the infraorder Mygalomorphae, that have two pairs of booklungs, and chelicerae (fangs) that move up and down in a stabbing motion.
Fang: The final hinged part of the chelicera, normally folded down into a groove in the basal part of the chelicera; venom is injected via an opening near the tip of the fang [11] Femur: see segments; Fertilization duct: A duct in female entelegyne spiders leading from the spermathecae to the uterus [10] Larinioides cornutus spider showing ...
However, spiders' chelicerae form fangs that most species use to inject venom into prey. The group has the open circulatory system typical of arthropods, in which a tube-like heart pumps blood through the hemocoel , which is the major body cavity.
The Araneomorphae (also called the Labidognatha or "true spiders" [1]) are an infraorder of spiders. They are distinguishable by chelicerae (fangs) that point diagonally forward and cross in a pinching action, in contrast to the Mygalomorphae (tarantulas and their close kin), where they point straight down.