BIOL 3270
Zoology
DEUTEROSTOME PHYLA
CHARACTERISTICS
1) the blastopore forms the anus
2) the mouth forms as a new invagination on the anterior end of the gastrula
3) cleavage is usually radial
4) the mesodermal tissue forms by enterocoely (formed by out-pocketing of the archenteron).
PHYLUM ECHINODERMATA
1) Spiny skin
2) Reduced cephalization
Class Asteroidea (starfish)
CHARACTERISTICS
1) star-shaped with 5 rays projecting from a large central disc
2) Pentaradial symmetry (not symmetrical internally and larvae are bilateral)
Starfish
IDENTIFY
Central disc
Oral surface
Ambulacral groove (where the tube feet are)
Aboral surface
Madreporite (‘pebble’ – opening to the water vascular system)
Tube feet
Mouth
Anus
Starfish pedicellariae
IDENTIFY
Epidermis
Valve
Starfish tube feet
IDENTIFY
Ampulla (suction cup)
Podium
Lateral canal
Longitudinal retractor muscle
Ampullary muscles
, DEVELOPMENT
Starfish early and late cleavage
radial cleavage (will produce radial symmetry in adult)
Relative allocation of cytoplasm to animal and vegetal poles
Different cell stages
Starfish gastrula
Anus
Starfish bipinnaria larvae
Locomotor bands of cilia
Mouth
Stomach
Starfish (dissection)
EXTERNAL
Central disc
Ambulacral groove
Ambulacral spine
Mouth
Podia (tube feet)
Madreporite
Anus
INTERNAL
Stomach - cardiac (evert cardiac stomach); pyloric
Pyloric cecum
Ambulacral ridge
Ampulla
Gonads
Water-vascular system: madreporite, stone canal, ring canal, lateral canal, radial canal,
podium
Questions
How do the oral and aboral surfaces move (fast, slow)?
Why do they move this way?
How do they feed, and why is this an adaptation?
Class Ophiuroidea (brittlestar)
CHARACTERISTICS
Zoology
DEUTEROSTOME PHYLA
CHARACTERISTICS
1) the blastopore forms the anus
2) the mouth forms as a new invagination on the anterior end of the gastrula
3) cleavage is usually radial
4) the mesodermal tissue forms by enterocoely (formed by out-pocketing of the archenteron).
PHYLUM ECHINODERMATA
1) Spiny skin
2) Reduced cephalization
Class Asteroidea (starfish)
CHARACTERISTICS
1) star-shaped with 5 rays projecting from a large central disc
2) Pentaradial symmetry (not symmetrical internally and larvae are bilateral)
Starfish
IDENTIFY
Central disc
Oral surface
Ambulacral groove (where the tube feet are)
Aboral surface
Madreporite (‘pebble’ – opening to the water vascular system)
Tube feet
Mouth
Anus
Starfish pedicellariae
IDENTIFY
Epidermis
Valve
Starfish tube feet
IDENTIFY
Ampulla (suction cup)
Podium
Lateral canal
Longitudinal retractor muscle
Ampullary muscles
, DEVELOPMENT
Starfish early and late cleavage
radial cleavage (will produce radial symmetry in adult)
Relative allocation of cytoplasm to animal and vegetal poles
Different cell stages
Starfish gastrula
Anus
Starfish bipinnaria larvae
Locomotor bands of cilia
Mouth
Stomach
Starfish (dissection)
EXTERNAL
Central disc
Ambulacral groove
Ambulacral spine
Mouth
Podia (tube feet)
Madreporite
Anus
INTERNAL
Stomach - cardiac (evert cardiac stomach); pyloric
Pyloric cecum
Ambulacral ridge
Ampulla
Gonads
Water-vascular system: madreporite, stone canal, ring canal, lateral canal, radial canal,
podium
Questions
How do the oral and aboral surfaces move (fast, slow)?
Why do they move this way?
How do they feed, and why is this an adaptation?
Class Ophiuroidea (brittlestar)
CHARACTERISTICS
