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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




Arthropods

Phylum Arthropoda

Insects, crabs, centipedes, spiders

Segmented body

Tough exoskeleton made of chitin

Jointed appendages


Evolution of Arthropods

Fewer body segments

Highly specialized appendages for feeding, movement and other functions



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


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


mosquito

centipede

squid

spider

butterfly

beetle


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


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

The horseshoe crab respires through organs: book gills


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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