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The tip of the tarsus bears claws, which vary in number and size. Spiders that spin webs typically have three claws, the middle one being small; hunting spiders typically have only two claws. Since they do not have antennae, spiders use specialised and sensitive setae on their legs to pick up scent, sounds, vibrations and air currents. [6]
Diagram of a spider leg and pedipalp – the pedipalp has one fewer segment. Arachnid legs differ from those of insects by the addition of two segments on either side of the tibia, the patella between the femur and the tibia, and the metatarsus (sometimes called basitarsus) between the tibia and the tarsus (sometimes called telotarsus), making a total of seven segments.
One is the "lock-and-key" theory. 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 ...
Pedipalps contain sensitive chemical detectors and function as taste and smell organs, supplementing those on the legs. [2] In sexually-mature male spiders, the final segment of the pedipalp, the tarsus, develops a complicated structure (sometimes called the palpal bulb or palpal organ) that is used to transfer sperm to the female seminal ...
Tarsus (plural tarsi; also called telotarsus): Seventh (last) leg segment, after the metatarsus Serrula : A row of tiny teeth along the edge of the maxilla Seta (plural setae): A bristle; [ 22 ] spiders have a variety of hair-like structures of increasing size that are referred to as hairs, bristles (setae) or spines [ 29 ]
The part closest to and attaching the leg to the cephalothorax is the coxa; the next segment is the short trochanter that works as a hinge for the following long segment, the femur; next is the spider's knee, the patella, which acts as the hinge for the tibia; the metatarsus is next, and it connects the tibia to the tarsus (which may be thought ...
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In all the spider anatomy diagrams in all of my books, including Biology of Spiders, The Spider Book, and Invertebrate Zoology (all of which are scholarly works with countless diagrams), the coxal gland is not illustrated once. I really don't think it's worth removing a leg (and associated parts) to show it.