Lecture 8 Flashcards Preview

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Flashcards in Lecture 8 Deck (11)
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1
Q

What are the key features of the protostomia?

A

They can be acoelomate, pseudocoelomate or coelomate
Spiral, determinate cleavage
Schizocoelus
Mouth develops from the blastopore

2
Q

What are the key features of the deuterostomia?

A

All coelomate
Radial, indeterminate cleavage
Enterocoelus
Anus develops from the blastopore

3
Q

What does schizocoelus mean?

A

Mesoderm develops between the gut and ectoderm with the coelom forming as a slit within the solid mesoderm

4
Q

What does enterocoelus mean?

A

Mesoderm buds from wall of developing gut splitting off to form the coelom retaining the slit

5
Q

Mesoderm buds from wall of developing gut splitting off to form the coelom retaining the slit

A

There are about 7000 species

Evolved independently of lophotrochozoa for over 500 million years

6
Q

What are the ecological features of the Echinodermata?

A

All are marine and sessile or slow moving

7
Q

What type of symmetry is found in Echinodermata?

A

Pentaradial symmetry (though the larvae are bilaterally symmetrical showing them to have evolved from a bilateral ancestor)

8
Q

What vascular system is seen in Echinodermata?

A

They have a unique water vascular system which consists of a madreporite (water inlet), ring canal, radial canal tube feet and ampullae (muscels which contract to increase local pressure)

9
Q

What organ systems are seen in the echniodermata?

A

A complete gut with a ventral mouth, central stomach and dorsal anus including digestive enzymes
Movement is controlled by radial nerves
Gonads are in arms

10
Q

What three groups are the chordata?

A

Urochordata (tunicates)
Cephalochordata (lancelets)
Vertebrata ( vertebrates)

11
Q

What are the defining characteristics of the chordata?

A

Dorsal, hollow nerve cord, post anal tail, notochord, pharyngeal slits (slits in the pharynx which allow ingested water to be returned to the water)