Subphylum Urochordata

Question 1

P. Urochordata is a description for which animal?

Answer 1

A Tunicate, otherwise known as a “sea squirt.”

Question 2

List the distinctive feature of a Tunicate

Answer 2

• Notochord
• Pharynx, Endostyle
• Dorsal nerve chord
• Post-anal tail

Question 3

What is the function of the Notochord?

Answer 3

Locomotion

Question 4

Function of the Dorsal nerve chord?

Answer 4

Sensory

Question 5

What is the function of the pharynx?

Answer 5

Feeding

Question 6

What is another word for Urochordata?

Answer 6

Invertebrate chordates

Question 7

What organic compound is found in this phylum that is normally not found within animals?

Answer 7

Cellulose

Question 8

What does cellulose do in Urochoratas?

Answer 8

It provides a soft, outer covering for the Tunicate. It is leathery and airy like a Tunicate (cloth).

Question 9

Describe the larval stage versus the adult stage:

Answer 9

Metamorphic - the larval stage vs the adult stage is radically different.

Question 10

Describe the feeding style and lifestyle of Urochordates
(sedentary, mobile, sessile, etc.)

Answer 10

Urochordates (Tunicates) are sessile, benthic, filter-feeders.

Question 11

Precursor to the backbone is the ___

Answer 11

Notochord - used for locomotion

Question 12

This feature is retained in many but lost in some.

Answer 12

Post-anal tail

Question 13

The equivalent of the thyroid gland in vertebrates is what in chordates?

Answer 13

The Endostyle, located in the pharynx, which is the source for hormonal distribution.

Question 14

In vertebrates, what is the evolution of the Dorsal, hollow, nerve tube?

Answer 14

Central Nervous System
Spinal chord connected to the brain.

Question 15

This structure excretes mucus

Answer 15

The endostyle