Chordata 1 Flashcards
1
Q
4 characteristics
A
- Dorsal Hollow Nerve Cord
- Notochord
- Pharyngeal gill slits
- Post-anal Tail
2
Q
Urochordata
A
- All four characteristics
- Larvae are free swimming
- Adults are sessile
- OPEN CIRCULATORY SYSTEM
- Use pharyngeal slits for filter feeding
3
Q
Cephalochordata
A
- Display all four characteristics
- first group to have dorsal/ventral aorta and segmented musculature
4
Q
Craniata
A
- Braincase
- Complex sensory organs
- Heart
- Hemoglobin
- Muscular gut
5
Q
Myxini
A
- Jawless
- Mostly scavengers
- Excrete copious amounts of “Mucus” when threatened
6
Q
Clade Vertebrata
A
- Vertebrae
- Two or more semicircular ear canals
- Includes lamprey
7
Q
Petromyzontida
A
- Lamprey
- No true bony vertebra
- Jawless with horny toothlike structures
- Can pump water directly into and out of their gills
- 18 of 38 species are ectoparasites
8
Q
Gnathostomata
A
- Jawed
- includes chondrichthyes and osteichthyes
9
Q
Chondrichthyes
A
- Cartilaginous
- 5 gill slits
- internal fertilization
- spiracle behind each eye
- Body covered in placoid scales made of dentin
- Ampullae
- Lateral Line - Detects movement, vibration, and pressure in the water
- Reproduction (Oviparous, Ovoviviparous, and viviparous)
10
Q
Osteichthyes
A
-Bony fishes
- Heavily ossified skeleton
- Lepidotrichia
- Lungs
- Notochord greatly reduced and forms intervertebral disks
11
Q
Actinopterygii
A
- Ray-finned fishes
- Dominant class of vertebrates
- Gills covered by bony operculum
- scales made from dermal bone
- Lateral line
