Chordates

Question 1

What is a stomochord?

Answer 1

Foregut pouch in Hemichordates, doesn’t provide structure.

Question 2

Why are hemichordates no longer considered Chordates?

Answer 2

Have no notochord (stomochord instead)

Question 3

Which chordate phyla has an endostyle?

Answer 3

Urochordates (Tunicates)

Question 4

A ____ secretes mucous sheets used to trap food particles within the cilia lined pharynx.

Answer 4

Endostyle

Question 5

Tunicates are different to Porifera because….

Answer 5

tunicate larvae possess all 4 chordate characteristics.

Question 6

Adult ___ retain a notochord

Answer 6

Cephalochordates (Lancelets)

Question 7

How do Cephalochordates feed?

Answer 7

Filter feeding

Question 8

Which subphlya uses a oral hood covered in buccal cirri to filter feed?

Answer 8

Cephalochordates (lancelets)

Question 9

What are myomeres?

Answer 9

visible muscle blocks in Cephalochordates

Question 10

How are urochordates different to cephalochordates?

Question 11

Muscles attachment to the endoskeleton is an important characteristic of all chordates. T/F?

Answer 11

True?

Question 12

Which two subphyla are acraniates?

Answer 12

Urochordate (tunicates) and Cephalochordates (Lancelets)

Question 13

The gill slits in Lancelets (cephalochordates) function for?

Answer 13

Filter feeding

Question 14

Adult Urochordates retain which chordate features?

Answer 14

Gill slits

Question 15

Myxini are classified as vertebrates because of the presence of?

Answer 15

A cranium

Question 16

Hyperoartia have a ______ while Myxini do not.

Answer 16

cartilaginous skeleton

Question 17

The only vertebrate class to have no endoskeleton are the ____

Answer 17

hagfish (myxini)

Question 18

What is Paedomorphosis?

Answer 18

Free swimming larvae with all 4 chordate features

Question 19

What does homologous mean?

Answer 19

Similar structures in different taxa derived from a common ancestor

Question 20

Ascidian larvae belong to which subphyla?

Question 21

The ____ is the core of the endoskeleton

Answer 21

vertebral column

Question 22

The ___ provides support for, and protects the dorsal hollow nerve cord and is used as a site for muscle attachment

Answer 22

vertebral column

Question 23

“<b>What are the 4 features that unite chordates?</b>”

Answer 23

<div> <div> In last week’s practical you learned the features that unite the chordates as a group:<br></br><ol> </ol><ul> <li> <div>Notochord </div> </li> <li> <div>Hollow dorsal nerve cord </div> </li> <li> <div>Pharyngeal slits (and bars) </div> </li> <li> <div>Post anal tail</div> </li> </ul> </div> </div>

Question 24

Ascidian larvae belong to which subphyla?

Answer 24

Subphylum Urochordates (tunincates)

Question 25

How are these similar to Echinoderms?

Answer 25

Bilateral larvae

Question 26

How do Myxini & Hyperoartia feed?

Answer 26

Myxini have toothed plates and a rasping tongue that attach to food host, while Hyperoartia don’t feed as adults, only in the the juvenile stage

Question 27

______ replaces the notochord during embryonic development, except in _____, that retain the notochord into adulthood.

Answer 27

Vertebral column, Agnathans

Question 28

These animals are scavengers that have a notochord, skull made of cartilage, and no vertebrae. What are they?

Answer 28

Hagfish

Class: Myxini
Superclass: Agnatha