LABORATORIO Phylum Arthropoda Subphylum CRUSTACEA EJERCICIO 14 Goals for today •  Learn to recognized the Phylum ARTHROPODA from other animals •  Learn the main diagnos>c characteris>cs of both the phylum and subphylum CRUSTACEA •  Learn about some species biology Phylum Arthropoda Arthropods with tardigrades and onychophores belong to the clade
Ecdysozoa Key characterisCcs of the phylum: •
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Coelomates Triploblas>c Bilateral symmetry Cephaliza>on Protostomates Metamerism= fusion of segments into tagmata Belong to phylogene>c clade: Ecdysozoa –  Ecdysis Complete diges>ve system Joined appendages Exoskeleton or cu>cle of chi>n Efficient tracheal system Hemolymph Subfilum Crustacea Crustaceans includes crabs,
shrimps, lobsters, etc Key characterisCcs of the phylum: * Head (cephalon) with 5 pairs of appendages; including 2 pairs of antennae * Trunk usually divided into thorax and abdomen * Appendages mostly biramous * Have compound eyes (oQen on stalks) and ocelli * Predominantly marine; some fresh water or terrestrial * Unique nauplius larva * Taxonomic note: Crustacea is likely paraphyle>c Crustacea: Your Tasks Exercise 14: –  Phylum:Arthropoda Subphylum Crustacea •  Clase Malacostraca, Orden Decapoda •  Genus: Cambarus (Crayfish lobster) Crayfish are found in freshwater streams
and ponds worldwide. Are omnivorous.
Introduced crayfish are known to harm
biological communities.
* Shrimp, crabs, lobsters, crayfish
* One pair of anterior clawed appendages
* Carapace well developed
* Marine, freshwater, and terrestrial (few)
Crustacea: Crayfish 1. Observe anatomia externa How do these animals grow? How many tagmata can
you recognize?
Crustacea: Crayfish 1. Observe anatomia externa Use figure 14.5 to distinguish some of the appendages
Crustacea: crabs Exercise 14: –  Phylum:Arthropoda Subphylum Crustacea •  Clase Malacostraca, Orden Decapoda •  Crabs *
Male
female
Crustacea 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Malacostraca, Orden Amphipoda •  Genus: Gammarus * Scuds
* Carapace absent
* Laterally
compressed
* Humpbacked
appearance
* Marine and fresh
water (some
semiterrestrial)
Crustacea: Brine shrimps 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Branchiopoda, Orden Anostraca •  Genus: Artemia * Fairy & brine shrimp
* Numerous (up to 19)
swimming appendages
* Lack a carapace
* Many in hypersaline
environments or vernal pools
Crustacea: fairy shrimp 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Branchiopoda, Orden Anostraca •  Genus: Eubranchipus Crustacea: water fleas 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Branchiopoda, Orden Cladocera •  Genus: Daphnia * Water Fleas
* Large folded carapace is not hinged
* Body segmentation reduced
* Use enlarged antennae for locomotion
* Large central compound eye
Crustacea 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Maxillopoda, Orden Ostracoda •  Genus: Cypris‐Ostracodo * Almost completely enclosed within hinged, bivalved carapace
* Overall seed or bean-shaped appearance
* No more than 2 pairs of post-cephalic appendages
* Most are tiny (<2 mm)
Crustacea Exercise 14: 1. Diseccion: observe la anatomia interna, recuerde que su –  Phylum:Arthropoda Subphylum Crustacea diseccion es evaluada por su instructor. Haga un buen trabajo. •  Clase Maxillopoda, Orden Copepoda •  Genus: Cyclops * Lack carapace, but have cephalic shield
* Small (<2 mm)
* Single median eye
* 6 thoracic and 5 abdominal segments
* No abdominal appendages or gills
* Mostly marine, planktonic drifters
Crustacea 1. Diseccion: observe la anatomia interna, recuerde que su Exercise 14: diseccion es evaluada por su instructor. Haga un buen trabajo.
–  Phylum:Arthropoda Subphylum Crustacea •  Clase Maxillopoda, Orden Cirripedia * Sessile; attach to various surfaces
as adults
* Attach with ventral surface up
* Most secrete thick calcium
carbonate shell
* Head reduced; abdomen absent
* Thoracic legs modified for
suspension feeding (cirri)
* Some species are parasitic
nauplius
zoea
Megalops-crab
http://wwwbio200.nsm.buffalo.edu/labs/tutor/Crayfish/