Respiratory System
Different species of spiders have variations in the particular method of respiration, but like all arthropods, black widow spiders don't have a 'nose', and breathe trough diffusion of oxygen into the blood in their breathing organ. Many spiders have book lungs, an organ with alternating layers of sinus and tissues, that allow for the diffusion of oxygen into the hemolymph. Some spiders have developed tracheal systems similar to those seen in many insects. Tracheal systems are more efficient than book lungs, and allows the spider to be more active. . Some spiders that live in moist, hydrated habitats, don't have a specialized respiratory organ, since the diffusion of oxygen through their skin alone is sufficient for their survival. The respiratory organs are situated in the lower abdomen, usually near the pedicel.
Nervous System
Their brains are composed of three main parts - the cheliceral ganglion, subesophageal ganglion, and the brain. The subesophageal
ganglion is situated, as the name suggests, below the esophagus, and the brain lies next to the cheliceral ganglion. The brain and the cheliceral ganglion are together called the supraesophageal ganglion, and are located above the subesophageal ganglion, and thus the esophagus. The cheliceral ganglion controls the chelicerae and the venom glands, and the brain is primarily tasked with vision. The nerves that control the abdomen, the cauda equina, originate in the subesophageal ganglion. The sub and supraesophageal ganglions make up the central nervous system of spiders.
Reproductive System
Most spiders reproduce sexually, and have well-developed sexual organs. Male spiders produce semen, and hold it in their pedipalps until they find a female. The semen is inserted into the female through her epigyne. Cannibalism among spiders after copulation is a well-documented phenomenon. The black widow spider (Latrodectus mactans) is a sexually dimorphic spider, with the female being almost twice as big as the male and rather different in pattern and colouration This species gains its common name from the common misconception that the female regularly eats the male after .mating It takes two to four months for black widow spiders to mature enough to breed, however full maturation typically takes six to nine months. The females can live for up to three years, while a male's lifespan is much shorter. The female may eat the male after mating.
Different species of spiders have variations in the particular method of respiration, but like all arthropods, black widow spiders don't have a 'nose', and breathe trough diffusion of oxygen into the blood in their breathing organ. Many spiders have book lungs, an organ with alternating layers of sinus and tissues, that allow for the diffusion of oxygen into the hemolymph. Some spiders have developed tracheal systems similar to those seen in many insects. Tracheal systems are more efficient than book lungs, and allows the spider to be more active. . Some spiders that live in moist, hydrated habitats, don't have a specialized respiratory organ, since the diffusion of oxygen through their skin alone is sufficient for their survival. The respiratory organs are situated in the lower abdomen, usually near the pedicel.
Nervous System
Their brains are composed of three main parts - the cheliceral ganglion, subesophageal ganglion, and the brain. The subesophageal
ganglion is situated, as the name suggests, below the esophagus, and the brain lies next to the cheliceral ganglion. The brain and the cheliceral ganglion are together called the supraesophageal ganglion, and are located above the subesophageal ganglion, and thus the esophagus. The cheliceral ganglion controls the chelicerae and the venom glands, and the brain is primarily tasked with vision. The nerves that control the abdomen, the cauda equina, originate in the subesophageal ganglion. The sub and supraesophageal ganglions make up the central nervous system of spiders.
Reproductive System
Most spiders reproduce sexually, and have well-developed sexual organs. Male spiders produce semen, and hold it in their pedipalps until they find a female. The semen is inserted into the female through her epigyne. Cannibalism among spiders after copulation is a well-documented phenomenon. The black widow spider (Latrodectus mactans) is a sexually dimorphic spider, with the female being almost twice as big as the male and rather different in pattern and colouration This species gains its common name from the common misconception that the female regularly eats the male after .mating It takes two to four months for black widow spiders to mature enough to breed, however full maturation typically takes six to nine months. The females can live for up to three years, while a male's lifespan is much shorter. The female may eat the male after mating.
Skeletal/Muscular System
The Black Widow along with man other spiders do not have a skeleton inside their bodies. The have a hard outer shell called a 'exoskeleton'.
Because its hard it cant grow with the spider. So young spiders need to shed their exoskeleton. The spider needs to climb out the molt though the cephalothorax. Once they are out, the strech themselves before the new exoskeleton forms.
http://.kidsnationgeographic.com/kids/printcreature/25/
The Black Widow along with man other spiders do not have a skeleton inside their bodies. The have a hard outer shell called a 'exoskeleton'.
Because its hard it cant grow with the spider. So young spiders need to shed their exoskeleton. The spider needs to climb out the molt though the cephalothorax. Once they are out, the strech themselves before the new exoskeleton forms.
http://.kidsnationgeographic.com/kids/printcreature/25/