Marine Ecology, April 9, 2007 Invertebrates 1: Phylum Porifera, Phylum Cnidaria, and assorted worm phyla.

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Presentation transcript:

Marine Ecology, April 9, 2007 Invertebrates 1: Phylum Porifera, Phylum Cnidaria, and assorted worm phyla

Phylum Porifera Basic sponge knowledge  Water movement and feeding Focus on the choanocyte  Protection in sponges Spicules Toxins Cryptic location Camouflage Regnerative ability

Haliclona sp. Nudibranch: Many are predators of sponges

Phylum Cnidaria Polyps and medusae  Basic parts of both body forms

Phylum Cnidaria Alternation of generations Note that anemones have no medusa form, but do have functional gonads within polyps Note that anemones have no medusa form, but do have functional gonads within polyps

Phylum Cnidaria Cnidocytes/nematocyst s

Phylum Cnidaria, Class Anthozoa Local intertidal species Anthopleura xanthogrammica Anthopleura elegantissima

Anthopleura artemesia Epiactis prolifera

Phylum Platyhelminthes Overall body organization

Marine Platyhelminthes

Phylum Nemertea

Phylum Nematoda: The roundworms

Phylum Annelida Overall body organization

Phylum Annelida, Class Polychaeta Free-crawling predators Family Nereidae Family Glyceridae Photos: Morris et al.

Phylum Annelida, Class Polychaeta Tube worms with tentacular crowns Family Sabellidae Photo: coralsphere.com Family Serpulidae Photo: Taata Divers

Phylum Annelida, Class Polychaeta Family Sabellidae

Phylum Annelida, Class Polychaeta Deposit feeders Family Terrebellidae

Phylum Annelida, Class Polychaeta Tube-dwelling, mucous-bag feeder (Chaetopterus) Family Chaetopteridae Photo: Erling Svensen

Epitoke Nereis sp.

Trocophore larva Photo: NOAA

Phylum Sipuncula Sketch from Invertebrate Zoology course; UC Santa Cruz, Professor Baldo Marinovic