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ECHINODERMATA
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Cards (76)
What is the Greek origin of the term
Echinodermata
?
It comes from "
echinos
" meaning sea hedgehog and "derma" meaning skin.
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What distinguishes echinoderms from all other members of the animal kingdom?
Echinoderms
are characterized by their spiny skin and
calcareous
endoskeleton
.
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What type of skeleton do
echinoderms
possess?
They possess a
calcareous
endoskeleton
.
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What are the objectives of studying
Phylum Echinodermata
?
State the distinguishing characteristics of echinoderms.
Identify the
classes
under Phylum Echinodermata.
Characterize the
representative
forms of each class.
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Name a representative echinoderm from the class
Asteroidea
.
Asterias
rubens
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What class does
Ophiothrix fragilis
belong to?
Asteroidea
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What is the representative
echinoderm
from the class
Holothuroidea
?
Holothuria scabra
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Which class does Strongylocentrorus purpuratus belong to?
Echinoidea
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What is the representative echinoderm from the class
Crinoidea
?
Metacinus rotundus
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What are the peculiar characteristics that distinguish echinoderms from all other animals?
Echinoderms
have
radial symmetry
, a
water vascular system
, and can
regenerate
lost body parts.
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What is
autotomy
in echinoderms?
Autotomy is a defensive mechanism where an animal intentionally sheds a body part to escape predators.
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How does regeneration differ from
autotomy
?
Regeneration
is the process of regrowing lost body parts, while autotomy is the shedding of body parts for defense.
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Why are echinoderms considered more advanced than previously discussed phyla?
They have a specialized water
vascular system
, an internal
calcareous endoskeleton
, and advanced
regenerative abilities
.
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What role does the
water vascular system
play in
echinoderms
?
It powers their tube feet for movement and feeding.
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What is the significance of the
calcareous
endoskeleton in
echinoderms
?
It provides structural support and protection.
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How do
echinoderms
demonstrate
ecological success
compared to simpler animal phyla?
Through their
evolutionary adaptations
to various
marine environments
.
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What type of environment do
echinoderms
exclusively inhabit?
Marine
environments
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How do the larvae of
echinoderms
differ from the adults?
Larvae are
bilaterally symmetrical
, while adults are
radially symmetrical
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What type of body structure do echinoderms possess?
Unsegmented and
triploblastic
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What is the origin of the water vascular system in
echinoderms
?
It is of
coelomic
origin
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How developed is the
circulatory system
in
echinoderms
?
It is
reduced
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How developed is the
sensory system
in echinoderms?
It is
poorly developed
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Which organ systems in echinoderms are well developed?
All other organ systems except the
circulatory
and
sensory
systems
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What is the reproductive strategy of the majority of
echinoderms
?
They are
monoecious
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What type of fertilization do
echinoderms
usually undergo?
External fertilization
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What does the development of
echinoderms
include?
Metamorphosis
through a specialized free-swimming
larval
stage
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What ability is widespread among echinoderms?
The ability to
regenerate
lost parts
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How do
echinoderms
typically move?
They are usually
slow-moving
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What are some representative forms of echinoderms and their classes?
Sea stars:
Archaster
,
Linckia
(
Class Asteroidea
)
Brittle stars:
Ophiura
,
Gorgonocephalus
(
Class Ophiuroidea
)
Sea urchins:
Tripneustes
,
Echinometra
(
Class Echinoidea
)
Sea cucumbers:
Holothuria
,
Synapta
(
Class Holothuroidea
)
Sea lilies:
Antedon
,
Lampometra
(
Class Crinoidea
)
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What does the term "
Asteroidea
" refer to in echinoderms?
It refers to the
class
that includes sea stars
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What does the term "
Ophiuroidea
" refer to in echinoderms?
It refers to the class that includes
brittle stars
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What does the term "
Echinoidea
" refer to in
echinoderms
?
It refers to the
class
that includes sea urchins
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What does the term "
Holothuroidea
" refer to in
echinoderms
?
It refers to the class that includes sea cucumbers
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What does the term "
Crinoidea
" refer to in echinoderms?
It refers to the
class
that includes sea lilies
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What are the unique features of
Phylum Chordata
?
Notochord
,
paired pharyngeal slits
, and
dorsal tubular nervous system
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What does the term
'notochord'
refer to in
Chordata
?
A flexible rod that provides support
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How do the
embryonic
features of
chordates
change in adults?
They may
persist
, change, or
disappear
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What type of symmetry do
chordates
exhibit?
Bilateral
symmetry
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What does
'triploblastic'
mean in the context of chordates?
Having three germ layers:
ectoderm
,
mesoderm
, and
endoderm
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What type of body cavity do
chordates
possess?
True coelom
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See all 76 cards
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