Phylum: Arthropoda

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Jennifer Franco's picture

under the major group Ecdysozoa

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What characteristics are responsible for the branching off of the arthropods from earlier animals?

eucoelomates with a hard segmented body

What characteristics do all arthropods have in common?

hard exoskeleton called a cuticle

What level of organization do these organisms demonstrate?

organ system level

How many tissue layers do these organisms have?

triploblastic

What are the 5 recognized subphyla in this phylum?

Trilobita
Checlicerata
Crustacea
Myriapoda
Hexapoda

When do they show up in the evolutionary history?

Precambrian

Where are they found?

worlwide

Type of Excretory System

excretory glands

Type of Circulatory System

Open system with dorsal contractile heart

Type of Respiratory system

body surfaces

Type of Nervous System

dorsal ganglia