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The external anatomy of a spider, with the epigyne labeled The internal anatomy of a spider, with the reproductive system (purple) reaching the exoskeleton at the epigyne External genital structure of female 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 .
The epigyne of the female spider also has a complex shape, and studies of pairs killed instantaneously during copulation show a precise fit between the male and female structures. Hence the shapes of both the palpal organs and the epigynes may have evolved to ensure that only individuals of the same species can mate.
Entelegyne: A spider whose female has an epigyne and separate ducts leading to spermathecae for sperm storage and to the uterus for fertilization, [6] creating a "flow-through" system; see haplogyne; see also Entelegynae; Basic arrangement of spider eyes, viewed from above Arrangement of eyes in most Salticidae, viewed from above
A spinneret is a silk-spinning organ of a spider or the larva of an insect. Some adult insects also have spinnerets, such as those borne on the forelegs of Embioptera. [1] Spinnerets are usually on the underside of a spider's opisthosoma, and are typically segmented. [2] [3] While most spiders have six spinnerets, some have two, four, or eight. [4]
Pages in category "Spider anatomy" The following 21 pages are in this category, out of 21 total. ... Epigyne; Exuviae; L. List of six-eyed spiders; P. Palpal bulb ...
The females can be distinguished by their epigyne. [8] The variation in size, shape and markings that have been observed is not thought to be due to location. Spiders found centimetres apart and siblings born from the same egg sac can look very different. [7] Male and female juvenile spiders are indistinguishable from each other. [7]
The ancestral (plesiomorphic) system is found in non-entelegyne spiders, where there is a single external genital opening in the female's abdomen. One or more males inject sperm from their palpal bulbs via this opening; the sperm is usually stored in special spermathecae (absent in some spiders, e.g. Pholcus). When eggs are released from the ...