Class Crustacea

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Subphylum Mandibulata

• Class Crustacea

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Subphylum Mandibulata

• 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

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Class Crustacea

• Defining Characteristics
• Crustacean Characteristics

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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

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Crustacean Segments Appendages

• Following segment is the thorax, which can have a
  variable amount of appendages
• The abdomen may or may not have appendages

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Taxonomic Summary

• Class Crustacea
• Subclass Cirripedia
• Subclass Copepoda
• Subclass Malacostraca
• Order Stomatopoda
• Order Euphausiacea
• Order Isopoda
• Order Amphipoda
• Order Decapoda

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Subclass Cirripedia

• Defining Characteristics
• All species are highly modified for attachment to
  hard substrates
• Thoracic limbs are modified as filtering cirri

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Havent 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?

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Barnacle Anatomy

• Have a reduced head and 6 segmented thorax
• Thorax - six pairs of feather like appendages
  which are used for suspension feeding

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Is that a roll of quarters, or are you just happy
to see me?
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Subclass Copepoda

• Defining Characteristics
• Loss of abdominal appendages
• Abundant in the plankton and benthic communities
  but due to small size escape notice

Harpacticoid
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Cows of the Sea
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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 6th abdominal segment are
  flattened to form uropods
• Contains nearly 75 of all crustaceans

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Malacostraca Characteristics
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Order Stomatopoda
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Order Euphausiacea

• Krill, a small group of only 85 species
• Have 8 pairs of walking feet instead of 5 like
  most decapods

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Order Isopoda
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Order Amphipoda