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Understanding Crustaceans: The Invertebrates of Our Oceans

This lecture delves into the fascinating world of crustaceans, a diverse group of invertebrates known for their hard exoskeletons. Found primarily in marine habitats, many species are key players in aquatic food webs, serving as vital sources of nutrition for various organisms. Humans also harvest crustaceans for consumption. The lecture covers their evolutionary traits, including molting behaviors, specialized appendages for feeding and defense, and the ecological significance of these creatures. Explore the complexity and role of crustaceans in marine ecosystems.

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Understanding Crustaceans: The Invertebrates of Our Oceans

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. Crustaceans • Named after their hard exoskeleton-crust. • Only some live in freshwater & land. • Most are found in marine habitats. • Play major roles in the food webs • Humans harvest edible ones. • Majority consume phytoplankton; some larval/small adult invertebrates, fish eggs & fish larvae. • Repeatedly molt and shed their exoskeleton.

  3. Crustaceans • Simplest onesresemble the annelid ancestors in having pairs of similar appendages along most of their body. • Complex ones have unspecialized appendages evolved into many diverse structures. • Claws of lobsters & crabs-used to collect food, intimidate other animals & sometimes dig burrow. • Feathery appendages comb microscopic bits of food from the water.

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