Basic characteristics of arachnids include four pairs of legs (1) and a body divided into two segments: the cephalothorax (2) and the abdomen (3).The ventral side of a brown widow spider. The epigastric plates and furrow are visible, as well as the hourglass marking on the underside of the abdomen, which is a characteristic feature of widow spiders.
The anatomy of spiders includes many characteristics shared with other arachnids. These characteristics include bodies divided into two tagmata (sections or segments), eight jointed legs, no wings or antennae, the presence of chelicerae and pedipalps, simple eyes, and an exoskeleton, which is periodically shed.
Spiders also have several adaptations that distinguish them from other arachnids. All spiders are capable of producing silk of various types, which many species use to build webs to ensnare 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]
^Reiskind, J. (1965). "The Taxonomic Problem of Sexual Dimorphism in Spiders and a Synonymy in Myrmecotypus (Araneae, Clubionidae)". Psyche: A Journal of Entomology. 72 (4): 279–281. doi:10.1155/1965/17894.
The anatomy of spiders includes many characteristics shared with other arachnids. These characteristics include bodies divided into two tagmata (sections...
A spider web, spiderweb, spider's web, or cobweb (from the archaic word coppe, meaning "spider") is a structure created by a spider out of proteinaceous...
Spider silk is a protein fibre or silk spun by spiders. Spiders use silk to make webs or other structures that function as adhesive traps to catch prey...
cardiaca Fovea (spider), a depression in the centre of the carapace Hilum, another term associated with anatomic pits or depressions Hilum (anatomy) Hilum (biology)...
copulatory organs of a male spider. They are borne on the last segment of the pedipalps (the front "limbs" of a spider), giving the spider an appearance often...
Comparative anatomy is the study of similarities and differences in the anatomy of different species. It is closely related to evolutionary biology and...
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among chelicerates – a group of arthropods including spiders, scorpions, horseshoe crabs, and sea spiders. The pedipalps are lateral to the chelicerae ("jaws")...
and anterior and posterior median eyes (AME) and (PME). Aspects of spideranatomy. This aspect shows the mainly prolateral surface of the anterior femora...
Cretaceous period. In addition to preserving spiders' anatomy in very fine detail, pieces of amber show spiders mating, killing prey, producing silk and possibly...
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gas exchange that is present in many arachnids, such as scorpions and spiders. Each of these organs is located inside an open ventral abdominal, air-filled...
female spider, including the copulatory ducts, spermathecae, and fertilization ducts Some abbreviations commonly found in descriptions of spideranatomy include:...
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of seven segments. The tarsus of spiders have claws at the end as well as a hook that helps with web-spinning. Spider legs can also serve sensory functions...
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Anatomy (from Ancient Greek ἀνατομή (anatomḗ) 'dissection') is the branch of morphology concerned with the study of the internal structure of organisms...
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for the AMSilk spider silk proteins. In 2015, AMSilk began producing Biosteel® Fibre made from 100% silk proteins based on natural spider silk. Then, in...
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conspicuous silk structure included in the webs of some species of orb-web spider. Its function is a subject of debate. Likely, the use of stabilimenta evolved...
Spidroins are the main proteins in spider silk. Different types of spider silk contain different spidroins, all of which are members of a single protein...
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