Marine Ecology, April 30, 2008 Invertebrates 4: Phylum Echinodermata & Phylum Chordata!
Feb 10, 2016
Marine Ecology, April 30, 2008Invertebrates 4: Phylum Echinodermata & Phylum Chordata!
Phylum EchinodermataBasic features Calcareous internal
skeleton Water vascular
system (controls tube feet)
Pentamerous symmetry (adults)/bilateral symmetry (larvae)
Mutable connective tissue
General body organization
Class Asteroidea (sea stars)
Appearance Location Other aspects of natural history
Pycnopodia helianthoidesPisaster ochraceus
Class Echinoidea (urchins and relatives) Appearance Location Other aspects of natural history
Strongylocentrotus purpuratus
Strongylocentrotus franciscanus
Class Holothuroidea(sea cucumbers) Cucumaria miniata
Photo: Neil McDaniel, Waterhouse Marine Images
Class Ophioroidea(Brittle stars, basket stars)
Class Crinoidea(Sea lilies, a.k.a feather stars)
Phylum ChordataSubphylum Urochordata
Our closest invertebrate relatives are slimy sacs that pump seawater
Class Ascidacea (tunicates)
Family Cottidae: sculpins
Family Gobiesocidae: clingfish
Family Pholidae: gunnels
Photo: Pelagia Scuba
Family Hexagrammidae (lingcods and greenlings)