1. Subphylum Mandibulata 1 Class Crustacea

2. Subphylum Mandibulata 2 All members of this group bear mandibles on the third head segment that are modified for feeding Taxonomic Summary – Phylum Arthropoda Subphylum Mandibulata – Class Myriapoda – Class Insecta – Class Crustacea

3. Subphylum Mandibulata 3 Class Crustacea Defining Characteristics Crustacean Characteristics

4. Subphylum Mandibulata 4 Crustacean Segments & Appendages The crustacean head consists of 5 segments fused tightly together These segments bear five paired appendages – 2 pairs of antennae – 1 pair of mandibles – 2 pairs of maxillae

5. Subphylum Mandibulata 5 Crustacean Segments & Appendages Following segment is the thorax, which can have a variable amount of appendages The abdomen may or may not have appendages

6. Subphylum Mandibulata 6 Taxonomic Summary Class Crustacea – Subclass Cirripedia – Subclass Copepoda – Subclass Malacostraca Order Stomatopoda Order Euphausiacea Order Isopoda Order Amphipoda Order Decapoda

7. Subphylum Mandibulata 7 Subclass Cirripedia Defining Characteristics – All species are highly modified for attachment to hard substrates – Thoracic limbs are modified as filtering cirri

8. Subphylum Mandibulata 8 Haven’t I Seen You Before Thought to be molluscs by early naturalists – Possess a shell that is secreted by “mantle tissue” What makes barnacles members of the phylum Arthropoda?

9. Subphylum Mandibulata 9 Barnacle Anatomy Have a reduced head and 6 segmented thorax – Thorax - six pairs of feather like appendages which are used for suspension feeding

10. Subphylum Mandibulata 10 Is that a roll of quarters, or are you just happy to see me?

11. Subphylum Mandibulata 11 Subclass Copepoda Defining Characteristics – Loss of abdominal appendages Abundant in the plankton and benthic communities; but due to small size escape notice Harpacticoid

12. Subphylum Mandibulata 12 Cows of the Sea Cyclopoid Calanoid

13. Subphylum Mandibulata 13 Subclass Malacostraca Defining Characteristics – The head has 5 fused segments, thoracic with 8 segments, abdomen with 6-7 segments plus a telson – Appendages on the 6 th abdominal segment are flattened to form uropods Contains nearly 75% of all crustaceans

14. Subphylum Mandibulata 14 Malacostraca Characteristics

15. Subphylum Mandibulata 15 Order Stomatopoda

16. Subphylum Mandibulata 16 Order Euphausiacea Krill, a small group of only 85 species Have 8 pairs of walking feet instead of 5 like most decapods

17. Subphylum Mandibulata 17 Order Isopoda

18. Subphylum Mandibulata 18 Order Amphipoda