LABORATORIO Phylum Arthropoda Subphylum CRUSTACEA Goals for today

LABORATORIO Phylum Arthropoda Subphylum CRUSTACEA

Goals for today • Learn to recognized the Phylum ARTHROPODA from other animals • Learn the main ‘diagnostic’ characteristics of both the phylum and subphylum CRUSTACEA • Learn about some species biology

Parazoa Porifera Radiata Eumetazoa Protostomia Bilateria Deuterostomia Ecdysozoa Annelida Mollusca Lophophorata Rotifera Platyhelminthes Cnidaria and Ctenophora Lophotrochozoa Arthropoda

Phylum Arthropoda Arthropods with tardigrades and onychophores belong to the clade Ecdysozoa Key characteristics of the phylum: • • • Coelomates Triploblastic Bilateral symmetry Cephalization Protostomates Metamerism= fusion of segments into tagmata Belong to phylogenetic clade: Ecdysozoa – Ecdysis Complete digestive system Joined appendages Exoskeleton or cuticle of chitin Efficient tracheal system Hemolymph

Subfilum Crustaceans includes crabs, shrimps, lobsters, etc Key characteristics of the subphylum: * 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 (often on stalks) and ocelli * Predominantly marine; some fresh water or terrestrial * Unique nauplius larva * Taxonomic note: Crustacea is likely paraphyletic * Exoesqueleto con quitina y carbonato de calcio

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: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • Clase Malacostraca, Orden Amphipoda • Genus: Gammarus * Scuds * Carapace absent * Laterally compressed * Humpbacked appearance * Marine and fresh water (some semiterrestrial)

Crustacea: Brine shrimps 1. Diseccion: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • 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 http: //www. youtube. com/watch? v=1 Bx_Jim. Gw. M 4&feature=related

Crustacea: fairy shrimp 1. Diseccion: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • Clase Branchiopoda, Orden Anostraca • Genus: Eubranchipus http: //www. youtube. com/watch? v=r. Ya. Ka. RGg. BY 8

Crustacea: water fleas 1. Diseccion: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • 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 http: //www. youtube. com/watch? v=k. FAm. Fu. H 4 A 0

Crustacea 1. Diseccion: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • 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: Exercise 14: observe la anatomia interna, recuerde que su diseccion es evaluada por su instructor. Crustacea Haga un buen trabajo. – Phylum: Arthropoda Subphylum • 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: //wwwbio 200. nsm. buffalo. edu/labs/tutor/Crayfish/