lophotochozoa

Question 1

veliger

Answer 1

larval stage unique to mollusks

Question 2

Mantle

Answer 2

the part of the mollusk body that secretes the shell; houses organs.

Question 3

Lophophore

Answer 3

a crown of ciliated tentacles used for feeding

Question 4

Trochophore

Answer 4

a free swimming larval stage that is surrounded by a ring of cilia (troch)
possessed several organs
undergo metamorphasis

Question 5

Brachipod

Answer 5

a lophophorate snimal that resembles a bivalve but possessed a lophphore inside its shell

Question 6

metamerism

Answer 6

the repeated body segments of an animal

Question 7

scolex

Answer 7

the structure that allows tapeworms to attach to their hosts

Question 8

corona

Answer 8

the locomotion/feeding structure of a rotifer

Question 9

parapodia

Answer 9

paddle-like appendages that aid in locomotion of some annelids

Question 10

Cephalization

Answer 10

the tendency for the brain and sensory organs to centralize toward an animal’s head

Question 11

Lophotrochozoa

Answer 11

• Display protosome devlopment: blastopore becomes mouth of juvenile
• do not perform ecdysis to grow
• soft bodies organisms that grow gradually
• possesses a lophophore: specialized feedin apparatus, ciliated tentables surround a mouth

Question 12

Platyhelminthes

Answer 12

flatworms;
bilaterally symmetrically not true body cavity;
less than 1mm thick; gases are exchanged by diffusion; incomplete gastrovascular cavity; mostly parasitic; hermaphorditic.

Question 13

Class Tubellaria

Answer 13

free-living group;
marine and freshwater enviornments;
Auricles - special chemoreceptive structures on the sides of the head;
ocelli allow the worm to differentiate between areas of light and dark; Sensory input is processed by the cerebral ganglia;
pharynx located midway down the body.

Question 14

Class Trematoda

Answer 14

parasitic flukes.
Head is crowned by a sucker with hooks or barbs for host attachment.
Complex life cycle; produce large quantities of eggs to ensure that at least a few are successful.

Question 15

Class Cestoda

Answer 15

parasitic tapeworms.
live intestines of hosts. lack a digestive tract . head regions known as scolex that had suckers and barbs or hooks for attachment to the lining of the intestine. proglottids;
ingested by herbivores;
cysts killed by high temps;

Question 16

Rotifers

Answer 16

wheel-bearers;
Corona - propels throught water, move particles to eat;
mastax- phatynx, jaws, unique;
digestive system;
microscopic;
inhibit freshwater;

Question 17

Brachipods

Answer 17

Sessile;
Lophophores inside shells;
attach to substrate with Pedicle;
filter feed;

Question 18

Mollusks

Answer 18

3 main parts: muscular foot(movement), Visceral mass(internal organs), Mantle(scretes the shell);
developed digestive, circulatory, excretory, respiratory and nervous systems.

Question 19

Class Polyplacophora

Answer 19

Chitons;
rocky shores;
oval and flattened;
shells held in place by muscles;
"roll up"
homing instinct;

Question 20

Class Bivalva

Answer 20

largest and ecologically significant group;
marine and freshwater;
clams, mussels, and oysters;
laterally compressed;
enclosed by two hinged valves;
Siphons - one inccurent and one excurrent.;

Question 21

Class Gastropoda

Answer 21

snails and slugs;
largest and most diverse class;
terrestrial forms;
broad, flat creeping foot;
gills or gas exchange;
highly vascularized mantle

Question 22

Class Cephalopoda

Answer 22

marine predators - octopus, squid, and chambered nautilus;
brain and enlarged head and tentacles;
sharp beak for crushing prey or injecting poison;
color changes and explosions of ink;
closed circulatory system

Question 23

Phylum Annelida

Answer 23

earthworms, leeches, and marine polychaete worms;
segmentation faciliates locomotion;
muscles can contract independent of each other.

Question 24

Repeated structures

Answer 24

nephridia
setae
neurons

Question 25

Well-developed digestive system

Answer 25

``` muscular pharynx esophogus crop gizzard long intestine anus ```

Question 26

Reproduction

Answer 26

clitellum

Question 27

simple nervous system

Answer 27

gangliion | ventral nerve cord

Question 28

locomostion

Answer 28

setae

Question 29

Class polychaeta

Answer 29

``` bristle worms and tapeworms; swim freely or burrow live in tubes; paddle-like appendages with setae; parapodia - swimming and gas exchange or defense ```

Question 30

Subclass Oligochaeta

Answer 30

earthworms; freshwater and terrestrial habitats; lack parapodia, few bristles, lack well-developed head; excrete mucus-like substace to keep bodies moist - facilitates movement; deposit feeders;

Question 31

subclass Hirudinea

Answer 31

leeches; freashwater; predominatly bloodsuckers of vertebrate and invertebrate animals; possess clitellum