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 separated spots. In some spiders
there is no pattern on the abdomen. The immature stages of both sexes of the
widow spiders have red or red-orange or yellow spots and strips on the top
of their abdomen. Females are colored gray or pale brown. Their color gets
darker as they get older. The hourglass pattern on the underside of the
abdomen forms throughout their development. Male widow spiders are smaller
about 1/4 inch long, and they're usually not black in overall color, instead
it looks like a light brown or gray. Male widows have an hourglass pattern
too. When they are full-grown they have large knob-like shapes called
pedipalps, which start from the head. But to females they still look the
same. Newly hatched spiderlings are white or a yellowish-white, eventually
turning blackish when they get older. Adolescents of both sexes look like
the male.
Black Widow spiders build loose and uneven mesh-type webs of rough silk in
dark places usually outdoors. And build their webs near the ground
(sometimes inside of houses) but mainly they build them outside. Black
Widows can be found near the ground in dark undisturbed areas. Nest sites
are near holes made by small animals, or around construction openings and
woodpiles. Also they can be found around low shrubs which are usual sites
for widow spiders. Black widows are also found inside in dark undisturbed
areas like behind furniture or under desks and in undisturbed basement areas
and crawl spaces of homes are areas where black widow nests are. They don't
produce a web like the weaving spiders do or the funnel pattern webs that the
funnel weaver spider's make.
The female lays eggs in silken cocoon sacs about 1/2-inch in width. The sack
is a pear shaped, and is a creamy yellow, light gray, or light brown in
color. They usually lay about 300 to 400 eggs per sac and have 4 to 9 egg
There is no doubt that arthropods are an extremely successful group of animals, with an estimated 5-10 million species worldwide[1], and this can be attributed to having an exoskeleton; it provides many benefits, such as protection from parasitism and other threats. However, one major disadvantage of having an exoskeleton is the limitations that an inelastic cuticle can place on growth. The exoskeleton provides protection, but when freshly moulted the animal is soft and vulnerable, as well as having limited mobility and use of appendages; many seek shelter before moulting[2]. There are similarities and differences between the moult cycles of all the arthropods, however only crustaceans and insects will be discussed here.
Gabriel Fallopius was one of the most noteworthy and respected Italian anatomists of the sixteenth century. He was known as many things during his life time. Although, to this day, he is well known for many of the great discoveries he encountered. During his lifetime of the 16th century, many people didn’t know much about the inside of today’s reproductive system, how they looked like, or what they were. Gabriel Fallopius inspired so many of his students to continue researching in the medical field who later became famous medical professionals. Due to his very successful accomplishments, we are able to learn and observe more of the women’s body to this day.
They found that their groupings of similar shaped pelvic girdles fell into the correct category, except at the family level.
Eggs are about 3 inches long and 2 inches across. Females lay one, two, or rarely, three eggs each year. They are white and become stained yellow in the nest.
For example, one can begin to determine the sex of the monarch butterfly in the larvae stage, but can only be done by dissection. The male will have a testis in the sixth abdominal segment, dorsal to the gut. The next stage of life is the Pupae. To determine the sex in this stage you need to have great vision or a microscope. The male butterfly has a cremaster which is a structure from which the pupa hangs, has a series of rings called abdominal sternites. Within the first ring, there are several paired black dots next to the cremaster. To determine that it is a female, the rings adjacent to the ninth sternite will have a line dissecting it which is centered between the pair of dots. Now we enter the adult stage of the Monarch butterfly. The male Monarch butterfly is somewhat larger than the female monarch butterfly. To designate if it is a male it will have a black spot on each of its hind wing. This is the most noticeable way to tell it is a male. In the female Monarch butterflies, they do not have spots on their hind wings they have thicker wing veins which make them darker in color than the male butterflies. If you happen to come across Monarch butterflies with their wings closed we are still able to determine the sex. The males’ dark spot should be able to be seen as it will bleed through the outside
Jeremias Gotthelf ‘s novella, “The Black Spider” is a highly ideological story of an evil poisonous black spider that wreaks havoc and death upon the villagers. It begins with a picturesque framework of a christening party on a farm, during which a guest notices and inquires about an incongruous black post on a newly built house. The grandfather then tells a story about a tyrannical knight by the name of Hans von Stoffeln who imposed impossible burdens upon the villagers and of the devil that appears as a huntsman to be their savior. One villager, Christine, agrees to the devils proposal, thinking she can outwit him. However, her betrayal unleashes an uncontainable and perpetual evil upon their town.
If I were Gary Anderson, I would not accept to take up the position of a project manager after the director stated that this project would be his baby all the way (Dawn, 2010). This statement shows that the director will overshadow the project and potentially become a hindrance to ultimate outcome of the project. There is a possibility of conflict of interest developing.
3. The primary sex characteristics enlarge and mature: in males--the testes, prostate gland, penis and seminal vesicles, in females--the ovaries, uterus and vagina (Papalia, et al., 1998).
The monarch butterfly, as known as Danaus plexippus, is often called the milkweed butterfly because its larvae eat the milkweed plant. They are also sometimes called "royalty butterflies" because their family name comes from the daughter of Danaus, ruler of Argos. There are many other interesting facts about this butterfly including its anatomy and life cycle, where the butterfly lies on the food chain, the migration from Canada to Mexico, why the butterfly is being threatened, and lastly, what is being done to help the butterfly.
Arachnida is a subphylum of Arthropoda, consisting of over 100 000 species, many of them being parasites which can carry disease. They are found in all environments, and mostly have eight legs, which is a feature, together with the fact that they do not have wings or antennae, often used to distinguish them from the other subphyla, though there are exceptions. They include spiders, scorpions, ticks and mites. Their bodies are divided up into three parts: the cephalothorax, the opisthosoma and the thorax, and use a type of lung for gas exchange. Most Arachnids are carnivorous, and eat pre-digested insects and other small animals. They reproduce using internal reproduction usually lay eggs, except for the scorpion which bears living young. The word ‘Arachnid’ comes from the Greek word ‘Arachne’ meaning ‘spider’.
The reproductive system was mainly located towards the anal area and inferior to the stomach. The penis was located in the middle. It was white in color and looked like a mealworm. The seminal vesicles were located on both sides of the penis. They were grayish pink in color and looked like walnuts.
varies from dark gray to gray with cinnamon, buff, tan, and black often have reddish
...e distal ends of the Mullerian ducts will form the oviducts, uterus and vagina. The opposite ends will form the fallopian tubes. The genital tubercle will from the clitoris, urethral folds remain open as the labia minora and the labioscrotal swellings become the labia majora.