Ch. 14: Echinoderms Flashcards
1
Q
Body symmetry
A
Pentaradial
2
Q
Exoskeleton or endoskeleton?
A
Endoskeleton
3
Q
Water vascular system
A
Ambulacral system
- Internal system with radial canals
- Used for locomotion, feeding, excretion
4
Q
Madreporite
A
A pore with tiny canals to handle water pressure
5
Q
Excretory system
A
- Most solids expelled via mouth
- Papillae (dermal gills) help excretion
6
Q
Pedicellaria
A
Claw- like structures that keep the surface clean
7
Q
Respiratory system
A
Gas exchange by diffusion
8
Q
Classes in Phylum Echniodermata
A
- Aseroidea
- Echinoidea
- Holothuroidea
- Ophiuroidea
- Crinoidea
9
Q
Class Asteroidea
A
- Sea stars
- Central disk surrounded by 5 arms
- Aboral non-functioning anus
- Sexual & asexual reproduction (s: gonads on arms; a: regeneration)
10
Q
Class Echinoidea
A
- Urchins and sand dollars
- All visceral organs inside central disk
- Tube feet
- Ossicles are fused
- Sea urchins: Aristotle’s lantern
11
Q
Class Holothuroidea
A
- Sea cucumbers
- Lengthened oral-aboral surface
- Soft body with thick dermis
- Tentacles around mouth
- Sexual reproduction
12
Q
Class Ophiuroidea
A
- Brittle stars
- Slender arms for locomotion
- Tube feet reduced
13
Q
Class Crinoidea
A
- Feather stars, sea lillies
- Mouth faces upward
- Produces mucus for food capture
