exam 3 Flashcards
Protosomes: Cleavage
Spiral
Deuterostomes: Cleavage
Radial
Protosomes: Fate of cells
Determinant
Deuterostomes: Fate of cells
Indeterminant
Protosomes: Origin of mesoderm
From clumps near blastopore
Deuterostomes: Origin of mesoderm
Outpockets of Archenteron
Protosomes: Coelom Formation
Schizocoelous
Deuterostomes: Coelom Formation
Enterocoelous
Protosomes: Fate of the blastopore
Mouth
Deuterostomes: Fate of the blastopore
Anus
Eucoelomate
- Has a true coelom (fluid filled body cavity) Example: Phylum Annelida
Hemocoelomate
Cavity that blood circulates through
Phylum Cycliophora: Habitat
Live on the mouth parts of marine decapods (lobsters) attach themselves to bristles with their adhesive discs on the end of an acellular stalk
Phylum Cycliophora: Lifestyle
Cycliophora feed by collecting bacteria or bits of food from dropped from their lobster host on a ring of compound cilia that surrounds the mouth
Phylum Entoprocta: How to distinguish from a hydroid? (Phylum Cnidaria?)
-Have ciliated tentacles that tend to roll inward, very distinct body cavities
Cnidarians do not have a true stomachs or intestines
Lophophorates: What is a lophophore?
a crown of tentacles that surrounds the mouth
Lophophorates: What phyla possesses a lophophore?
Bryozoa, Brachiopoda, Phoronida
Phylum Bryozoa/Ectoprocta: How to distinguish from hydroid (Phylum Cnidaria)
- Bryozoans have lophophores
- Cnidarians have calcium carbonate skeletons
Phylum Brachiopoda: Major differences between brachiopods and mollusks
Plane of symmetry in a bivalve runs along the hinge line
plane of symmetry in a brachiopod is perpendicular to the hinge line
How to distinguish class articulata and class inarticulata
Articulata have pedicels
inarticulata open and close with muscles
