Intro Arthropods notes

Phylum: Arthropoda

Phylum: Arthropoda

Arthropods are the joint-legged animals. (arthro = jointed & poda = leg)

Characteristics…..

1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.


1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.2. Jointed appendages (tentacles, setae, etc. were not jointed).


1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.2. Jointed appendages (tentacles, setae, etc. were not jointed).3. Metameric (segmented) body plan, like their annelid

ancestors.


1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.2. Jointed appendages (tentacles, setae, etc. were not jointed).3. Metameric body plan, like their annelid ancestors, the body is divided into distinct segments.


1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.2. Jointed appendages (tentacles, setae, etc. were not jointed).3. Metameric body plan, like their annelid ancestors, the body is divided into distinct segments.4. Open circulatory system.


1. an external skeleton called an exoskeleton that supports & protects their body. Made of chitin.2. Jointed appendages (tentacles, setae, etc. were not jointed).3. Metameric body plan, like their annelid ancestors, the body is divided into distinct segments.4. Open circulatory system.5. Well developed, linear nervous system.

Scientists have described about 2 million species of organisms. About 1 million of them are arthropods.


If success is measured by species diversity, arthropods are the most successful organisms!

Arthropods 50%

All plants, fungi,bacteria, and all other animals


If success is measured by species diversity, arthropods are the most successful organisms!

Kingdom

Phylum

Class

Order

Family

Genus

Species

Kingdom

Phylum Subphylum (not quite different enough to Class be a class, but too similar to

be a phylum of its own) Order

Family

Genus

Species

extinct

extinct extant

Trilobites were marine arthropods. They are all extinct and we only know them as fossils.

Subphylum: Trilobitomorpha

The three extant subphyla of arthropods are classified based on the number of antennae they have.


Subphylum Chelicerata (zero)



Subphylum Crustacea (two)



Subphylum Uniramia (one)

Subphylum Crustacea (two)

Intro Arthropods notes

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