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Arthropods and Echinoderms. Biology I: Chapter 28. ARTHROPODS. ARTHROPODS. Arthropods. Phylum Arthropoda Insects, crabs, centipedes, spiders Segmented body Tough exoskeleton made of chitin Jointed appendages. Evolution of Arthropods. Fewer body segments

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Arthropods and Echinoderms

Biology I: Chapter 28

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Arthropods

Phylum Arthropoda

Insects, crabs, centipedes, spiders

Segmented body

Tough exoskeleton made of chitin

Jointed appendages

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Evolution of Arthropods

Fewer body segments

Highly specialized appendages for feeding, movement and other functions

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Form and Function in Arthropods

Complex organ systems; some only found only in this phylum

Tracheal tubes (respiration)

Open circulatory system

Excrete wastes through saclike tubules

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Feeding

Herbivores, carnivores, omnivores, bloodsuckers, filter feeders, detritivores, and parasites

Mouthparts have evolved to allow them to eat anything imaginable

Pincers or fangs to sickle-shaped jaws that can cut through the tissues of captured prey

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mosquito

centipede

squid

spider

butterfly

beetle

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Respiration: Terrestrial Arthropods

Tracheal tube: one of many branching, air-filled tubes that extend throughout the body

Spiracle: small opening located along the side of the body through which air enters and leaves the body

Book lung: organ that has layers of respiratory tissue stacked like the pages of a book: used to exchange gases

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Respire through feather-like gills (i.e. lobster and crabs)

The horseshoe crab respires through organs: book gills

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Circulation

Open circulatory system

Well-developed heart pumps blood through arteries that branch and enter the tissues

Blood leaves the blood vessels and moves through sinuses, or cavities

The blood recollects in a large sinus surrounding the heart

It reenters the heart and is again pumped throughout the body

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