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Objectives  To define . Prepared for Marine Biology  Examine and become familiar with marine By Diana Wheat & Carolyn Lebsack arthropods – namely crustaceans. - Isopods - Decapods - Copepods - Krill - Barnacles  To be introduced to life history patterns i.e. reproduction.

Phylum Arthropoda Most crustaceans have separate males and females Subphylum Crustacea Isopods include terrestrial, freshwater, and marine  Arthropods are the jointed appendage . .  Have an exoskelton. > Some deep sea forms.  Crustaceans, for the most part, have remained in > Pill bugs are a well known group of terrestrial isopods marine and freshwater environments.  Typically have branched appendages that are extensively specialized for feeding and locomotion.  Small crustaceans exchange gases through the cuticle; larger crustaceans have gills

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Decapods Molting – to grow

Relatively large crustaceans and include lobsters, , crayfish, and shrimp. Feature 10 legs/appendages

Reproduction – females carry egg Developmental Stages pouches – easy to I.D.

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Copepods – important Juvenile form called “zoe” zooplankton.

Turn plant material into tissue.

Figure 33.39b

Planktonic crustaceans include many species of copepods, which are among the most numerous of all animals. Larval form called a “nauplius.”

(b) Krill

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Barnacles Acorn Barnacles

Mostly sessile crustaceans

They have a cuticle that is hardened into a shell.

Cement for life. Hermaphroditic. Feed by feet raking the water. “Cirri”

Figure 33.39c

Decorator – gracilis

(a) Ghost crab (c) Barnacles

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Largest Crab – Mole crab (usually in intertidal) Japanese Spider Crab

Follows the tide in and out.

Lobster – One of the most Recap- successful of fisheries. Relevancy? Why should we know about Custaceans?

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