The Characteristics of Deuterostomes

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What type of cleavage do deuterostomes have?
Radial - cleavage planes are parallel or perpendicular to the vertical axis of the embryo
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What is the developmental fate of deuterostome cells?
Indeterminate - not yet determinded
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What does the blastopore of deuterstomes develop in to?
The anus
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Name the 3 phyla of deuterostomes
Echinodermata, Hemichordata, Chordata
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Describe the derived characteristics of hemichordata
Gill slits, CNS, postanal tail, body is tripartite
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Name the 2 classes of hemichordates
Enteropneusts (Acorn worms), Pterobranchs (sea angels).
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Describe the characteristics of enteropneusts
Benthic inhabitants, deposit and suspension feeders, use peristaltic movements for burrowing in sand
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Describe the characteristics of pterobranchs
Tube-dwelling marine animals, tiny suspension feeders
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Name the 5 classes of echinoderms
Sea Stars, sea cucumbers, sea lillies, brittle stars, sea urchins and sand dollars.
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Describe the characteristics of sea stars
Pentamerous radial symmetry (larvae bilateral), thin epidermis covers an endoskeleton of hard calcerous plates
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What is unique to the echinoderms?
The water vascular system (formed from left mesocoel)
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Describe the features of the water vascular system of echinoderms
Central ring in central disk, radial canals go into the 5 arms, lateral canals connect the radial canal to the tube feet, the stone canal and a pore called the madreporite connect the ring canal to the outside
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Where would you find the tube feet and what do they consist of?
On the oral side in the abulacral groove, consist of an ampulla and a podium
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What is the role of the tube feet?
Locomotion, adhesion, prey manipulation, gas exchange
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What do star fish feed on?
clams and oysters
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What is so special about star fish?
They can regenerate lost body parts
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What makes sand dollars irregular echinoids?
bilateral symmetry, tube feet on aboral side, locomotion with the help of spikes on oral side
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Other cards in this set

Card 2

Front

What is the developmental fate of deuterostome cells?

Back

Indeterminate - not yet determinded

Card 3

Front

What does the blastopore of deuterstomes develop in to?

Back

Preview of the front of card 3

Card 4

Front

Name the 3 phyla of deuterostomes

Back

Preview of the front of card 4

Card 5

Front

Describe the derived characteristics of hemichordata

Back

Preview of the front of card 5
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