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Marine Arthropods PowerPoint

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					PHYLUM ARTHROPODA
 **MOST NUMEROUS PHYLUM:80%
OF ALL LIVING SPECIES




   GREEK: “JOINTED FOOT”
Major Characteristics
 Segmented body plan: head, thorax,
  abdomen

 Open circulatory system: hemolymph


 Compound eyes


 Many jointed specialized appendages/limbs
Exoskeleton

 Cuticle made of chitin and/or calcium
  carbonate
 Impedes growth
 Animals must molt
          to grow
2 Marine subphyla
 Subphylum Crustacea
  Class Maxillopoda=barnacles
  Class Malacostraca=shrimp,
     lobster, crab


 Subphlylum Chelicerata:
  Class Merostomata=horse shoe crabs
Subphylum Crustacea
Class Maxillopoda “barnacles”

 Reduction in abdomen and its appendages
 Encrusters: attach themselves to any hard
  substrate
 Shells usually have 6 plates
 Suspension/filter feeders
 Grasp food with
 feathery appendages
Reproduction
 Free swimming larvae: molt X6
 Hermaphroditic
 Because they cannot move-sexual
  reproduction is difficult
 have extraordinarily long penises: largest
  penis to body size ratio of the animal
  kingdom
Subphylum Crustacea
Class Malacostraca “crab,
shrimp, lobster”
 19-20 body segments
 Segments fuse to make body parts: head,
  thorax, abdomen
 Each segment may have a pair of appendages
   Characteristics
 Claws called chelipeds
 Mouthparts called maxillipeds
 Head and thorax is fused=
  forms a cephalothorax
 Swim/Crawl
 Most are predators,
      some detritovors
 Reproduction
 Separate sexes
 Lunar cycles
 Copulation takes place after female molts:
  her exoskeleton is soft:
 Eggs are released or brooded: brood pouch
http://animal.discovery.com/videos/fooled-by-
nature-christmas-island-crab-migration.html
Mantis shrimp




                                 http://videos.howstuffworks.com/discovery/4
                                 564-the-predatory-shrimp-video.htm

                               http://www.youtube.com/watch?v=pgvsQ6o
                               NZyo&NR=1

                                   Pistol shrimp
                               http://www.youtube.com/watch?v=ONQlTMUYC
                               W4&feature=related




 http://www.youtube.com/watch?v=XC6I8iPiHT8&feature=related
Subphylum Chelicerata
Class Merostomata “horseshoe
crabs”
 Closely related to spiders not crabs
 Found on Atlantic coast
 Often called a “living fossil”: similar fossils are
  dated to 400 mya
     Characteristics



 4 complex eyes
 Mouth appendages called chelicera
 Horseshoe shaped carapace
 Tail called telson
 Females are much larger than males
 5 pairs of flattened plates called book gills
  help with breathing
chelicerae
 Reproduction
 Females are much larger than males
 Sex maturity at 9 years: can live to be 20
  years old
 Males attach to shells of females with
  specialized claws and can hold on for months




                         http://www.pbs.org/wnet/nature/episodes/cra
                         sh-a-tale-of-two-species/video-full-
                         episode/4772/
Concept Map: for each class

 3 major characteristics


 2 species from Oregon for each class:
   Where found (type of habitat, depth, region)
   Prey
   Predator
   Reproduction
   Local laws (bag /catch limits)

				
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posted:3/30/2013
language:Latin
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