Adult black widow spiders have a shiny, black, rounded, circular abdomen and are about 1/3 inch long (about 1-1/2 inches when their legs are spread). Adult spiders have two reddish or yellowish triangles on their bottom which looks like an hourglass marking, and their body color is dark colored usually black or sometimes dark brown. They are usually recognized because of their red or red-orange hourglass design on the bottom of their abdomen. This pattern is changeable and may look like two
sexual cannibalism. Sexual cannibalism is when the female spider eats the male after they mate. The Theridiidae is known as the cobweb spiders. The types of the Theridiidae spiders I will be discussing are the widow spiders or know by the genus name Latrodectus. There are a lot of myths that people believe about the widow spiders, which make people afraid of them. I will give a description about them and correct any miss inform idea about them.
spiders. Southern Black Widow is a common name for the spider which is classified scientifically as K: Animalia, P: Arthropoda, C: Arachnida, O: Araneae, F: Theridiidae, G:Latrodectus, S: mactans. There are 31 differnet species from the genus Latrodectus. This genus is commonly referred to as widow spiders. Other members of this genus include hesperus, varilous, and revivensis (http://www.animalcorner.co.uk/venanimals/ven_spidblkwid.html). The class spiders belong is Arachnida. Class Arachnida
is classified scientifically as K: Animalia, P: Arthropoda, C: Arachnida, O: Araneae, F: Theridiidae, G:Latrodectus, S: mactans. The species name mactans specifies the southern black widow spider. There are 31 different species from the genus Latrodectus. This genus is commonly referred to as widow spiders. Other members of this genus include hesperus, varilous, and revivensis (Balaban 2005). The class spiders belong to is Arachnida. Class Arachnida contains one of the defining traits of a spider
Spiders My essay is on spiders. I have chosen a few spiders to report about. I also have some basic info about spiders in general. Spiders comprise a large, widespread group of carnivorous arthropods. They have eight legs, can produce silk, and usually have poison glands associated with fangs. More than 30,000 species of spiders are found on every continent except Antarctica in almost every kind of terrestrial habitat and a few aquatic ones as well. Spiders range in body size from about 0.5 mm
fecundity of the female, increasing the reproductive chances of the male as well, but if the female mates again the male loses any apparent benefit. Some spiders seem to have resolved this problem in favor of both sexes such as the redback spider, Latrodectus hasselti. Experiments involving polygamy in this species revealed that cannibalized males had greater fertilization success because these males mated longer and the cannibalistic females tended not to mate again. This shows that a compromise is