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Invertebrate Zoology Lecture 17: Phylum Arthropoda, Part 2 Subphylum Crustacea Focus: Marine Crustacea.

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Presentation on theme: "Invertebrate Zoology Lecture 17: Phylum Arthropoda, Part 2 Subphylum Crustacea Focus: Marine Crustacea."— Presentation transcript:

1 Invertebrate Zoology Lecture 17: Phylum Arthropoda, Part 2 Subphylum Crustacea Focus: Marine Crustacea

2 Lecture outline  Subphylum Crustacea  Overview  Selected groups

3 Key Crustacean features  Two pairs of antennae; 3 pairs of mouthparts (mandibles, 2 prs maxillae)  Compound eyes, sometimes on stalks  Body regions:  Head and thorax often  "cephalothorax“  Abdomen  Biramous appendages: thoracic & abdominal  Calcium carbonate in cuticle  Many have gills

4 Crustacea diversity: overview  Differences in tagmatization  Differences in appendage structure & function  Is the Class Remepedia truly “primitive?”

5 Class Malacostraca ( Subclass Eumalacostraca)  Five-segmented head  Eight-segmented thorax  Six-segmented abdomen  “Tail” = telson + uropods  Carapace: partly/completely covers head & thorax

6 Class Malacostraca  Thoracic appendages = thoracopods  Maxilloped  Cheliped  Pereopod  Abdominal appendages  Pleopod

7 Class Malacostraca  Order Euphausiacea: krill!

8 Class Malacostraca  Order Euphausiacea: krill!  Pelagic; schooling  Key food resource in marine food webs  Pereopods  feeding basket  Compression-filtration  Pleopods: swimming  Ancestral to Decapoda?

9 Class Malacostraca  Order Decapoda  T1 – T3 = maxillopeds  T4-T8 for grasping & movement  T4 often is chelate (claw-like)  Gills: base of thoracic appendages  Cephalothorax covered by carapace  Stalked eyes

10 Class Malacostraca  Order Decapoda: Infraorder Caridea  Shrimp  “Classic” Decapoda features  Most similar to early Decapoda?  Compare to Euphausiacea

11 Class Malacostraca  Order Decapoda: Infraorder Caridea  Variety of local species  Oregon pink shrimp!  Protandrous hermaphrodites  Sustainable fishery (rare)  Cleaner shrimp  Bay shrimp

12 Class Malacostraca  Order Decapoda: Infraorder Palinura  Spiny lobsters  Similar to Caridea  Common in S. California  Lack powerful cheliped  Protection?  Group molting

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14 Class Malacostraca  Order Decapoda: Infraorder Anomura  T4 chelate  Reduction of T8 & sometimes T7  Abdomen not key in movement  Pleopod reduction  Asymmetrical or tucked

15 Class Malacostraca  Order Decapoda: Infraorder Anomura  Hermit crabs  Role of reduced T7, T8  Asymmetry  Acquiring shells Students.washington.edu

16 Class Malacostraca  Order Decapoda: Infraorder Anomura  Porcelain crabs  Role of reduced T8  Role of abdomen  Filter feeding  Other behaviors and oddities

17 Class Malacostraca  Order Decapoda: Infraorder Anomura  Mole crabs  Thoracopods specialized for “paddling” sand  Why doesn’t it suffocate when buried?

18 Class Malacostraca  Order Decapoda: Infraorder Brachyura  True crabs  T4-T8 well-developed; T4 chelate  Reduced abdomen  Adaptive value?

19 Shore crabs Pachygrapsus crassipes Hemigrapsus oregonensis Hemigrapsus nudus

20 Cancer sp. crabs C. antennarius C. productus C. magister C. oregonensis

21 Pugettia producta: shield-backed kelp crab

22 Reproduction: Cancer spp.

23 Reproduction

24 Class Malacostraca Subclass Eumalacostraca  Order Stomatopoda: mantis shrimps

25 Class Malacostraca Subclass Eumalacostraca  Order Stomatopoda: mantis shrimps  Predatory; burrow dwellers  Second thoracopod = raptorial  Slicer/stabbers  Smashers  Gills associated with abdominal appendages  Coloration  threat displays  mate attraction

26 Class Malacostraca Order Amphipoda

27  Laterally compressed  Cephalon: head plus first thoracic segment  Non-stalked eyes; compound  Thoracic brood pouch  Beachhopper appendages  Gnathopods  Some modified for jumping  Pleopods  Movement; respiration

28 Caprellid with thoracic brood pouch

29 Class Malacostraca Order Isopoda Idotea sp. Ligiapallasii

30 Class Malacostraca Order Isopoda  Dorso-ventrally compressed  Cephalon: head plus first thoracic segment  Non-stalked eyes; compound  Antennae 2 long  Pereon = rest of thorax  Seven pairs of similar legs  Abdomen: pleopods for swimming, respiration

31 Class Maxillopoda Infraclass Cirripedia: barnacles  Carapace covered by calcareous plates  Four valves  Head  No antennae after settling  3 pairs of mouthparts  Thorax  Six pairs of biramous appendages (cirri)  Long penis  No abdomen  Feeding

32 Order Cirripedia: the barnacles Balanus, Semibalanus sp. Chthamalus sp. Pollicipes polymerus

33 Cirripedia: life cycle

34 Class Maxillopoda Subclass Copepoda  Abundant  Key primary consumer  Appendages  Antennae  Long first antennae: propulsion  Second antennae: feeding current  Thoracic appendages  T1 is a maxilliped  T2-T5 : periopods (swimming)  No abdominal appendages  Oil droplets: lipid reserves and buoyancy


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