Lecture 32 - Chordates Flashcards Preview

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Flashcards in Lecture 32 - Chordates Deck (39)
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1

4 major physical characteristics of chordates

1. notochord
2. dorsal hollow nerve chord
3. pharyngeal slits
4. post-anal tail

2

Subphylum Cephalochordata

(lancelets)

3

Subphylum Cephalochordata (characteristic/env./nutr.)

-basal chordates
-environment: marine
-nutrition: suspension feeders

4

Subphylum Urochordata

tunicate, sea squirts

5

Subphylum Urochordata (env./nutr.)

environment: marine
nutrition: suspension feeders

6

2 characcteristics of Subphylum Urochordata

1. two siphons, adult animals without backbones
2. “tadpole” larva

7

What are the Peter Pan of tunicates?

Larvaceans, they never grow up

8

What are pelagic tunicates? importance?

-salps
-important component of some pelagic ecosystems

9

Subphylum Myxini

hagfish

10

Subphylum Myxini (env./nutr.)

environment: aquatic
nutrition: scavengers

11

3 characteristics of Myxini

1.
2.
3.

12

Subphylum Petromyzontida

lampreys

13

Subphylum Petromyzontida (env./nutr.)

environment: aquatic
nutrition: parasitic (ecoparasite)
-uses rasping tongue to penetrate skin of prey + inject blood/other tissues

14

3 characteristics of Subphylum Petromyzontida

1. jawless
2. vertebrates
3. cephalization

15

Subphylum Chondrichtyes

sharks + rays

16

Subphylum Chondrichtyes (env./nutr.)

environment: aquatic
nutrition: carnivores + filter feeders
-spiral valve increases SA

17

Subphylum Chondrichtyes (body)

haw + paired fins + cartilage endoskeleton

18

Subphylum Chondrichtyes (reproducition)

internal fertilization

19

Subphylum Chondrichtyes (3 major senses)

1. sharp vision
2. olfaction
3. lateral line detects low freq. vibrations

20

What are rays?

-Flattened bottom dwellers
-related to sharks

21

Subphylum Actinoptergii

ray-finned fishes

22

Subphylum Actinoptergii (class)

Osteichthyes (bony fish)

23

Subphylum Actinoptergii (body, 4)

1. ossified endoskeleton
2. maneuverable swimmers
3. swim bladder
4. operculum (gill-breathers)

24

Subphylum Actinoptergii (reproduction)

variable

25

Subphylum Actinoptergii (senses)

lateral line

26

Why are Subphylum Actinoptergii neutrally bouyant?

swim blatter

27

Subphylum Actinistia

oelacanth

28

Subphylum Actinistia (body/evolution)

Body: muscular pectoral + pelvic fins, bony skeleton
Evolution: lobe fins evolve into limbs + feet

29

Subphylum Dipnoi

lungfish

30

Subphylum Dipnoi (environment, body, evolution)

Environment: freshwater
Body: have lungs + gills
Evolution: sister group of tetrapods