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Flashcards in mollusca Deck (35):
1

Mollusca

means "soft body"

2

tube used to take in water (oxygen) and food.

siphon

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meaning of Gastropoda

stomach foot

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meaning of cephalopoda

head-foot

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tissue that secretes a shell

mantle

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Blood circulation is of this design

an open circulatory system

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tongue-like structure with tiny bone plates

radula

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type of circulation seen in this group

a closed circulatory system

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structure used for locomotion

a foot

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This structure can be made into an anchor or extended. by diverting blood into a particular sinus

foot

11

this structure produces a lubricating slime to aid in movement

the foot

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feature that is highly evolved and approaches that of mammals in ability

the eyes

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material shells are made of

calcium carbonate

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gametes are spread into the water for fertilization and possible distribution

broadcast fertilization

15

term for organisms like snails which possess both gametes for fertilization

hermaphridite

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the foot has specialized into these structures

what are arms and tentacles

17

larval type shared with annelids

trochophore larva

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structure used for gas exchange

gills

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sensory structures found on snails

light sensitive eyes and antennae

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highly developed system in active predator, relative to that seen in a clam or a snail

nervous system

21

class Mollusca

includes
-class bivalvia (clams and oysters)
-class Gastropoda (snails and slugs)
-class Cephalopoda (octopus and squid)

22

all members of Mollusca must have

1. mantle
-tissues that secretes shell material, calcium carbonate H20 out of siphon
2.Muscular Foot
-locomotary or clinging foot
3. Soft-bodied

23

Class Bivalvia (2 valves) (clams, oysters, mussels)

-sessile
-filter feeders
-range of habitats due to siphon and shell
-open circulatory system with 2 chambered heart

24

Class bivalvia siphon and shells

-siphon (double tube) take in food and oxygen get rid of waste and CO2
-shell 2 part shell, closes tightly and retain water necessary for survival

25

class bivalvia circulatory system

Open circulatory system with 2 chambered heart
§ Blood delivered to sinuses (chambers) in tissues
§ Soaks tissues delivering oxygen and
removing carbon dioxide
§ Blood can be withheld in a sinus, causing
tissue to swell up

26

clams foot

can be extended and used as an anchor to aid in movement

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bivalvia are sessile animals

-they broadcast gametes into water for distribution and possible fertilization
-trocophorelarva (similar to Annelids) develops from zygote
-gills exchange gases with water drawn in through siphon

28

bivalvia digestive tract

-simple,short
-undigested material released through anus back into water via siphon
-nephridia, removes metabolic waste-localized to one region

29

bivalvia nervous system

-not highly specialized due to sessile slow moving lifestyle
-brain area + nerve cords operate foot and siphon

30

Class Gastropoda (stomach foot) (snails, shells) (Slug, no shell)


-snail mantle located around open edge of shell
-Foot: compromises soft tissue mass on ventral surface
-muscular undulations allow slow movement
-slime acts as a lubricant when crawling
-radula (tongue-like structure with bony plates) for feeding

31

Class Gastrapoda are what

-hermaphroditic (annelids, exchange sperm between reproductive organs on ventral surface)
-fertilization occurs later; eggs deposited in damp places

32

class Gastropoda nervous system

-light sensitive "eyes" on retractable antennae
-cephalized with distinct head region
-2 chambered hearts
-open circulatory

33

Class Cephalopoda (head foot) (squid, cuttlefish, octopus, nautilus.)

-Most highly evolved/specialized members of phylum
-hunters noted for subdivided foot, large heads, well-developed nervous systems and move quickly
-closed circulatory system
-zoom zoom fast
-Efficient swimmers, move by jet propulsion water is forced out of siphon

34

class cephalopoda eye

-similar ability to learn and behave in a complex manner

35

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