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This show a phylogenetic tree of arachnids.

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Taxonomy alone can give you information regarding the relatedness of these organisms because it shows that they are closely related because they are all in the same category up until Order.

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Common name: Black Widow
Animalia
Anthropod
arachnid
spider
Theridiidae
widow spiders
Latrodectus
2.

Common name: Emporor Scorpion
animalia
anthropod
arachnid
scorpion
Scorpionidae
pandinus
emporor scorpion

3.

Common name: Lone Star Tick
animalia
anthropod
arachnid
ixodida
ixodidae
Amblyomma
Lone star tick

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Descent through modification is seen through the venomn changes in spiders throughout the years as they change and evolve to adapt to catch bigger and more difficult prey. This shows directional selection because the species went from weaker venomn to stronger venomn.

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1. There is an island that is populated by wolf spiders. This shows geographic isolation, meaning organisms are separated from exchanging genetic material with other organisms of the same species.

2. On the island, the species went through stabilizing selection because they were critically endangered, but managed to survive.

3. Immigration impacts all three of the organisms in the taxonomic group. This is because a new individual brings in new genes into the mix of things, causing a new mix of genes to flow in and out of the species. This as well affects the stragglers because they may not have anyone to mate with if immigration occurs.

4. Evolution follows the gradualism process of evolution because the wolf spiders evolved complicated venom over a long period of time, rather than a short, drastic time.

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1. Meshweavers, a variety of spider, has a chromosome number of 2. While jumping spiders having a chomosome number of 38. They are both related, even though their chromosome numbers are so different.

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1. all have mandables

2. all have eight legs

3. all have a fused head

4. all have an open circulatory system

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1. Name of fossil: Nephila jurassica

Age of fossil (give time period as well)

Jurassic period

1. Name of fossil: Electroblemma bifida

Age of fossil (give time period as well)

99 million years old

Cretaceous period

1. Name of fossil: Deinocroton draculi

Age of fossil (give time period as well)

99 million years old

Cretaceous period

1. Name of fossil: Eurypterids

Age of fossil (give time period as well)

permian period

460 to 248 million years ago

1. Name of fossil: Chimerarachne yingi

Age of fossil (give time period as well)

100 million years ago

crestaceous period

First arachnids were crab-like creatures.

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wolf spiders:

1. Wolf spiders are one of the only species of spiders to stay with their egg sacs. staying with the egg sac may or may not increase the survival rate, but I couldn’t find whether or not this is true.

2. Ticks: Female ticks lay thousands of eggs at a time. They do not stay with their babies. Their babies go through life cycles. the four stages are egg, larva, nyph, and adult.

3. Scorpions have about 100 babies at a time. baby scorpions stay with their mothers for 10-20 days.

4. Their head first develops, then their legs, and then throasix region.

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- have eight legs
- mandibles
- an open circulatory system
- and a fused head called a cephalothorax