Hemichordates Flashcards Preview

Vertebrate Zoology > Hemichordates > Flashcards

Flashcards in Hemichordates Deck (23)
Loading flashcards...
1

What are the 2 classes of hemichordata?

Enteropneusta
Pterobranchia

2

What type of taxonomic group is hemichordata?

Phylum

3

What 2 key features make hemichordates similar to chordates?

Pharangeal gill slits
Dorsal nerve cord

4

What are enteropneusta known as?

Acorn worms

5

What time of circulatory system do hemichordates have?

Open circulatory system

6

Why was hemichordata once a sub phylum of chordata?

Hemichordates' buccal diverticulums resemble notochords

7

What is the main difference between hemichordates and chordates?

They do not have homologous notochords

8

What is a buccal diverticulum?

An extension of the mouth cavity

9

What unique structure do hemichordates possess?

A glomerulus

10

In what type of habitat to hemichordates live?

Marine, intertidal

11

How do pterobranchs feed?

Filter feeding using a lophophore-like feeding structure

12

What are pharyngeal gill slits?

Repeated openings along the pharynx, caudal to the mouth, allowing movement of water in the mouth and out the slits

13

What is a key use of pharyngeal gill slits in hemichordates?

Filter feeding

14

What is a hemichordate glomerulus?

A sac at the rear of the mouth with finger-like projections, containing waste products and nutrients

15

How do hemichordates use their glomerulus?

Blood leaving the system passes through the glomerulus to extract nutrients

16

Which marine zone do most adult hemichordates live in?

Benthic zone

17

Where do hemichordates burrow?

In mud and soft sediments

18

True or false: most hemichordates are dioecious.

True

19

What type of feeders are enteropneusts?

Deposit/suspension feeders

20

How do enteropneusts reproduce?

Asexually and sexually

21

How to pterobranchs reproduce?

Mostly asexually

22

What is a Tornaria?

The free-swimming larval stage of enteropneusts

23

True or false: pterobranchs are solitary

False - pterobranchs live in colonies, with some being connected to each other by tissue extensions called stolons