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Zoology > Molluscs/Echinodermata > Flashcards

Molluscs/Echinodermata Flashcards

0
Q

Mantle

A

Two fields of skins, outgrowths dorsal body wall

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1
Q

Visceral Mass

A

Contains digestive, circumatory, respiratory, and reproductive organs

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2
Q

Mantle cavity

A

Space between mantle + body wall

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3
Q

Protective shell is secreted by…

A

Mantle over visceral mass + head foot

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4
Q

Radula

A

Rasping, protrusible tonguelike organ found in all mollusks

Ribbonlike membrane where rows of tiny teeth are

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5
Q

Foot

A

Ventral, solelike structure

Waves of muscular contraction effects a creeping motion

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6
Q

Mantle + Mantle cavity (functions)

A

Houses respiratory organs

Surface serves for gaseous exchange

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7
Q

Mollusc Difinitive Traits

A

Radula
Foot
Mantle

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8
Q

Moll. Circulatory

A

Open circulatory w pumping heart, blood vessels

ceph. Have closed blood system w heart, vessels, capillaries

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9
Q

Moll. Nervous

A

Pairs of ganglia w connecting nerve cords

Specialized sense organs

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10
Q

Moll. Reproductive

A

Dioecious (snails mono)

Sexual

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11
Q

Ceph. Respiration

A

Thru body surface (usually mantle) and gills or lungs

Nitrogenous waste&raquo_space;> kidney

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12
Q

Ctenidea

A

Flat gills found in mantle cavity

Absorb oxygen from water

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13
Q

Moll. trochophore

A

Minute, transluscent top-shaped, prominent circletts of cilia found in molluscs

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14
Q

Moll. veliger

A

Free swimmig larva

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15
Q

Polyplacophora

A

Cling onto rocks, use radula to scrape algae and plant material

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16
Q

Gastropoda

A

Snails & Slugs

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17
Q

Gastropoda Torsion

A

Process that moves mantle cavity in front of the body

Uneven growth of right & left muscles that attach shell to foot & differences in muscle contractions on sides of body

Causes foiling

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18
Q

Gastropoda foiling

A

Wastes may be washed back over the gills

Better water sampling

Head can be drawn into shell

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19
Q

Gastropoda Coiling

A

Spiral winding, coiling of shell & visceral bump

BILATERAL ASYMMETRY

20
Q

Pelecypoda

A

Clams, oysters, mussels, scallops
“Bivalves”
Soft body protected by 2 hard shells hinged together

21
Q

Bivalve

A

2 shells held together by hinge ligament

Adductor muscles work in opposition to the hinge ligament to draw valves together

22
Q

Cephalopoda

A 
"Head footed"
Octopus cuttlefish squid
Most well developed nervous system
Intelligent
Most have tentacles
23
Q

Echinodermata

A

Spiny skinned

24
Q

Echin. Symmetry

A

Larvae bilateral&raquo_space; radial adult

25
Q

Coelomate

A

Space between gut tube & body wall

26
Q

All Echinoderms have…

A 
An endoskeleton for ossicles
Water-vascular system
Pedicellariae 
Dermal branchiae (skin gills)
Secondary radial symmetry
27
Q

Ambulacral Grooves

A

Radiate out along the arms from the centrally located mouth on the oral side of the animal

28
Q

Radial nerve

A

Runs down center of each ambulacral groove between the tube feet

29
Q

Pedicellariae

A

Minute, pincerlike, bearing tiny jaws, manipulated by muscles; keep body surface free of debris (barnacles cannot attach)

30
Q

Aboral

A

Surface, usually rough & spiny

31
Q

Madreporite

A

Leads to WV system

32
Q

Endoskeleton

A

Beneath epidermis

33
Q

Ossicles

A

Tiny, interlocking CA based plates
Embedded within skin
Project spines and tubercles (often poisonous)

34
Q

Catch connective tissue

A

Allows echinoderms to change consistency from very flexible to very stiff in seconds

35
Q

Papulae (dermal branchiae)

A

Soft, delicate projections out of the coelom that extend out through spaces between ossicles
Exchange of gasses and nitrogenous waste

36
Q

Ceolom (echin)

A

Spacious body ceolom filled w fluid

circulates around body

37
Q

Water Vascular System

A

Water filled radial canals
Surrounding central disc
Circulation and filling tube feet

38
Q

Tube feet

A

Used for locomotion and to grab objects

Suckers

39
Q

Digestive System (echin)

A

Complete system ( mouth, stomach, intestine, anus)

Stomach comes in contact w food, secretes digestive enzymes, absorbs nutrients

Waste excreted thru arms

Digestion happens outside of the body

40
Q

Nervous system (echin)

A

Nerve ring & radial nerves at diff levels in the disc and arms; connected by nerve net

41
Q

Ocelli (echin)

A

Found at tips of arms

Light receptors, negative phototaxis

42
Q

Sensory cells ( in echinoderms )

A

Scattered thru epidermis

43
Q

Reproduction (echin, sexual )

A

Fertilization happens externally, sperm and eggs released

Left side of body becomes oral surface; forms tube feet

Right side becomes aboral surface, forms ossicles

44
Q

Regeneration (echin)

A

Echinoderms can regenerate lost body parts as long as a portion of the central disc remains in tact

45
Q

Echinodermata, Crinoidea

A

Feather stars, sea liies
Usually sessile, connect to sea floor w a stalk
Filter feed using tube foot-like extensions

46
Q

Echinodermata Ophiuroidea

A

Brittle stars, basket stars
FAST
tube feet no suction, used for locomotion
Scavengers, predators
Basket stars have branched arms that capture plankton

47
Q

Echinodermata Echinoidea

A

Sea urchins, sea biscuits, sand dollars

Buscuits & $$ have tiny projections used for movement

Urchins have long, sharp spines

48
Q

Echinodermata Holothuroidea

A

Sea cucumbers -__-
Fleshy, secondary bilateral due to position and reduction of role of tube feet
Live on ocean floor, sediment feeders

Zoology (6 decks)

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