Study Help for Mini-Practicals

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Study Help for Mini-Practicals


You should know what characteristics define each of the taxonomic groups below. To accomplish this, use your key. You may also use the “Identification” chapters in the field guides in lab to help identify specimens.

  • Phylum Porifera

    • Class Demospongiae (demosponges)

  • Phylum Cnidaria

    • Class Hydrozoa (hydroids)

    • Class Scyphozoa (true jellyfish)

    • Class Anthozoa

      • Subclass Octocorallia [Alcyonaria] (soft corals)

      • Subclass Hexacorallia [Zooantharia]

        • Order Scleractinia (hard corals)

        • Order Actiniaria (anemones)

  • Phylum Ctenophora (ctenophores)

  • Phylum Arthropoda

    • Subphylum Chelicerata

      • Class Merostomata (horseshoe crabs)

    • Subphylum Crustacea

      • Class Cirripedia (barnacles)

      • Class Copepoda (copepods)

      • Class Malacostraca

        • Order Stomatopoda (mantis shrimp, thumbsplitter)

        • Order Isopoda (isopod, marine rolly-polly)

        • Order Decapoda (crab, shrimp, lobster)

        • Order Amphipoda (scuds, beach fleas)S

  • Phylum Mollusca

    • Class Gastropoda (snails, limpets…)

    • Class Bivalvia (oysters, clams,…)

    • Class Cephalopoda (squid, octopus, cuttlefish)

    • Class Polyplacophora (chitons)

  • Phylum Annelida

    • Class Polychaeta

      • Order Sedentaria (sedentary polycheates)

      • Order Errantia (marine polycheates)

    • Class Echiura (spoon worms)

  • Phylum Echinodermata

    • Class Echinoidea (urchins, sand dollars)

    • Class Ophiuroidea* (brittle stars)

    • Class Asteroidea* (sea stars)

    • Class Holothuroidea (sea cucumbers)

  • Phylum Bryozoa (moss animals)

  • Phylum Chordata

    • Subphylum Urochordata (tunicates or sea squirts)

      • Class Ascidiacea

  • Phylum Chaetognatha (arrow worms)

  • Phylum Brachipoda (lamp shells)

  • Phylum Sipuncula (peanut worms)

*Note that Classes Ophiuroidea and Asteroidea have more recently been lumped into a single class Stellaroidea and are now each considered a subclass.

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