Flashcards in Lecture 32 - Chordates Deck (39)
Loading flashcards...
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
