Crustaceans  to Define Arthropods

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4/26/2018 Objectives Crustaceans To define arthropods. 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 crustacean 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 animals. species. 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 © 2011 Pearson Education, Inc. © 2011 Pearson Education, Inc. 1 4/26/2018 Decapods Molting – to grow Relatively large crustaceans and include lobsters, crabs, crayfish, and shrimp. Feature 10 legs/appendages Reproduction – females carry egg Developmental Stages pouches – easy to I.D. 2 4/26/2018 Copepods – important Juvenile form called “zoe” zooplankton. Turn plant material into animal 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 © 2011 Pearson Education, Inc. 3 4/26/2018 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 Crab – Oregonia gracilis (a) Ghost crab (c) Barnacles Smithsonian.com 4 4/26/2018 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? 5.

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