9. Describe the respiratory structures use by onychophorans, spiders, horseshoe crabs, terrestrial isopods, myriapods, and insects. Compare and contrast them. Which of these are homologous structures? Which are convergent?

Human Anatomy & Physiology (11th Edition)
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**Question 9:**

Describe the respiratory structures used by onychophorans, spiders, horseshoe crabs, terrestrial isopods, myriapods, and insects. Compare and contrast them. Which of these are homologous structures? Which are convergent?
Transcribed Image Text:**Question 9:** Describe the respiratory structures used by onychophorans, spiders, horseshoe crabs, terrestrial isopods, myriapods, and insects. Compare and contrast them. Which of these are homologous structures? Which are convergent?
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Onchyphora: Any segmented, limbless, wormlike land invertebrate of the phylum Onychophora that breathes by lung and is intermediate in structure and evolutionary development between annelids and arthropods.

Spiders:  Air-breathing arthropods with eighth feet, chelicerae that can usually inject venom. They are the group of arthropods.

Horseshoe crab: Horseshoe crabs are the  water arthropods. Despite their name, they are actually chelicerates, which are most closely related to arachnids like spiders and scorpions. They are not true crabs or crustaceans.

Isopods: Terrestrial isopods are a class of crustaceans that have adapted to live on land. They are important members of terrestrial ecosystems because they help control the microbial food.

Myriapods: A member of the invertebrate phylum Arthropoda, which includes a number of closely related orders, is a myriapod.

Insects: They make up the majority of the arthropod phylum. Insects have a three-part body, three pairs of jointed legs, compound eyes, and one pair of antennae in addition to a chitinous exoskeleton.

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