(Phylum Arthropoda) - Part 8 (_/16)

Phylum Arthropoda

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What does Arthropoda mean and examples?

“jointed feet” or “jointed legs.” 

Examples: insects, spiders, crabs, crayfish, and centipedes.

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Arthropod skeleton type?

Exoskeleton (outside skeleton).

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Exoskeleton made of what?

Chitin (calcium carbonate).

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Why do arthropods molt?

Molt means to shed the old exoskeleton, they do this to grow their body.

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What is an instar?

A growth stage of an arthropod between molts.

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Main arthropod body regions?

Crayfish/spiders: cephalothorax and abdomen

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Crayfish class?

Class Crustacea.

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What is the ovipositor?

Female egg-laying structure.

Phylum Arthropoda

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Crayfish body regions?

Cephalothorax, abdomen, tail.

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Tail fan parts (end of a crayfish)?

Telson (the middle pointed piece of the tail fan)
&
Uropods (the flat side pieces of the tail fan).

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What are chelipeds?

Big claws.

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Function of crayfish gills?

Gas exchange.

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Male crayfish special structure?

Modified swimmerets used to transfer sperm to the female during reproduction.

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Grasshopper class?

Class Insecta

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What are spiracles and function of them?

Small openings on the sides of an insect’s body and they let air enter and leave the body for breathing.

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How are male and female swimmerets different?

-In females -> swimmerets are flexible/longer than in males