deuterostomia Flashcards
1
Q
chrodates characteristics
A
- notochord
- dorsal hollow nerve cord
- pharyngeal (gill) slits
- postanal tail
2
Q
phylum echinodermata
A
- WATER VASCULAR SYSTEM !!!!! – use to breath, move appendages, and aid in digestion
- pentaradial symmetry (body composed of 5 equal parts)
- larvae - bilaterally symmetrical
- adult - radial symmetry
3
Q
water vascular system !!!
6
A
madreporite –> stone canal –> ring canal –> radial canal –> ampullae –> tube feet
4
Q
star cellular development
4
A
- fertilized egg undergoes cell division (cleavage)
- embryo becomes a hollow ball of cells (blastula)
- cell pinch inwards (archenteron) during the gastula phase
- opening of the blastopore is the archenteron (digestive tract)
5
Q
class asteroidea
3
A
- 5 arms
- tube feets
- predators or scavengers
ex. sea stars
6
Q
class ophiuroidea
4
A
- more slender arms
- tube feets that tend to lack suckers
- move by pushing and wrapping themselves to things
- predators, scavengers, or suspension-feeding
ex. brittle and basket stars
7
Q
class echinoidea
4
A
- ridgid endoskeleton - test
- lacks arms but has movable spine
- sea urchins are opportunistic omnivores
- sand dollars are scavengers and suspension feeders
ex. sea urchins and sand dollars
8
Q
class holothuroidea
4
A
- saclike body
- reduced ossicles
- tentacle-like tube feet for suspension-feeding
- can eviscerate (expel insides)
ex. sea cucumber
9
Q
class crinoidea
4
A
- attach to hard rock bottom
- filter feed
- juvenile form - sea lilies
- adult form - feather stars
ex. crinoids (only extant ones)
10
Q
chordata phylum
A
all vertebrates are chorodata but not all chordatas are vertebrates
have 4 main characteristics
11
Q
subphylum urochordata
3
A
- distinct larval and adult forms
- larvae are free living and have all of the chordate characteristics. bilateral symmetry
- adult tunicates tend to be sessile
ex. sea squirts
12
Q
subphylum cephalochordata
4
A
- segmented, fishlike animals
- shallow marine waters
- have all of the chordata features as an adult
- no jaws, fins, sense organs, or developed brain
ex. lancelets
13
Q
subphylum vertebrata
3
A
- cranium
- bony or catilaginous structure w/ brain
- vertebral column (replaces the notochord)
14
Q
class cyclostomata
A
made up of petromyzontidas (lampreys) and myxinis (hagfish)
- agnathans (w/o jaws)
15
Q
class chondrichthyes
A
chondro - cartilage
ichthys - fish
- have an endoskeleton rather than bone
- ampullae of lorenzini – organs that detect weak electrical fields produced by other organisms
- elasmobranchs (sharks)
- chimaeras (cartilaginous fish- ghost sharks)
