echinodermata Flashcards
1
Q
What are Ecdysozoa?
A
- group of phyla that all share the trait of having a non-living cuticle that must be shed to grow and develop
- include arthropoa, nematoda, tardigrada, onychophora
2
Q
what is a defining feature of phylum tartigrada?
A
- protrusible oral stylets
3
Q
Phylum Tardigrada have cryptobiosis which mean….
A
“hiding biology”, an adaptation to withstand extreme conditions
4
Q
What is phylum tardigrada?
A
- part of the ecdysozoa group
- chitinous cuticle, unwaxed
- incredibly small organisms
5
Q
what is phylum onychophora
A
- part of the ecdysozoa group
- chitinous cuticle, unwaxed
- “velvet worms”
6
Q
what are the defining characteristics of echinodermata?
A
- water vascular system
- pentamerous radial symmetry
- calcareous endoskeleton
- mutable connective tissue
7
Q
what is ‘autonomy’ of limbs?
A
- in phylum echinodermata, the ability to drop body parts if needed
8
Q
how do echinodermata reproduce?
A
- gonochoristic
- can undergo sexual reproduction
- can undergo asexual as well, but fission (breaking off body parts) `
9
Q
what is the water vascular system?
A
- defining characteristic of echinodermata
- primarily used for locomotion, as a hydrostatic skeleton, circulatory system, respiratory system
10
Q
What is the primary anatomy of the water vascular system?
A
- madreporite and stone canal (point of entry for water)
- ring canal (equilizes pressure)
- polian vesicles (stores water to control pressure within the system)
- radial canals ( supplies water to tube feet)
- tube feet and ampullae (used for grasping, locomotion)
11
Q
What is mutable connective tissue
A
- defining characteristic of Echinodermata
- connective tissue that is under voluntary nervous control
- allows for limbs to become “solid” ,while giving the chance for the muscles to relax
12
Q
What is class crinoidea?
A
- class under phylum enchinodermata
- body supported by a stalk or cirri
- very ancient
- mostly sessile, and suspension feeders
13
Q
What classes are under phylum echinodermata?
A
- crinoidea
- stelleroidea
- echinoidea
- holothuroidea
14
Q
What is class stelleroidea?
A
- class under phylum enchinodermata
- starfish
- 5n arms extending from central disc
15
Q
2 subclasses under class stelleroidea?
A
- ophiuroidea (brittle stars)
- asteroidea (asteroid starfish)
16
Q
What is subclass ophiuroidea?
A
- under class stelleroidea, under phylum enchinodermata
- brittle stars
- bursal slits allow for gas exchange, circulates water and allows for waste removal
17
Q
What is subclass asteroidea?
A
- under class stelleroidea, under phylum enchinodermata
- gonads and digestive tract extend into arms
- cardiac and pyloric stomach
18
Q
What is class echinoidea?
A
- under phylum Echinodermata
- sea urchins
- podia pores through plates
- aristotles lantern
- lack arms
- ‘exterior’ covered by oral surface
19
Q
A
