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Flashcards in Animal - Protostome Deck (38)
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1

protostome

major lineage of animals
- embryonic development pattern: mouth b4 anus
- coelem formation: mesoderm block splits
- live in aquatic & terrestrial habitats

(ie) mollucks, anthropods, annelids

2

lophophore

specialized feeding structure found in some lophotrochozoans
- used in suspension feeding
- feather-like

3

trochophore

larva w/ ring of cilia around its middle
- found in some lophotrochozoans

4

worm

animal w/ long, thin, tubelike body lacking limbs

5

proboscis

tubular, often extendable, feeding appendage w/ which food can be obtained

6

foot

large musclar appendage @ base of animal
- 1 of 3 main parts of mollusk body
- used for movements

7

visceral mass

contains most of internal organs & external gill
- 1 of 3 main parts of mollusk body

8

mantle

thick outer tissue
- 1 of 3 main parts of mollusk body
- may secrete a CaCO3 shell
- protects visceral mass

9

hemocoel

body cavity
- present in arthopods & some mollusks
- contains heolymph (pool of circulatory fluid) bathing internal organs
- not lined in mesoderm
- "blood hollow"

10

radula

rasping feeding appendage in mollusks

(ie) gastropods: snails, slugs

11

siphon

tube-like appendage of many mollusks
- often used for feeding
- spits out water for propulsion

12

corona

cluster of cilia @ anterior end of rotifer
- often facilitates suspension feeding
- hair crown

13

parthenogenesis

development of offspring from unfertilized eggs
- asexual reproduction

14

chaetae

bristle-like extensions found in some annelids

15

parapodia

appendages found in some annelids from which bristle-like structures (chaetae) extend

16

gills

any organ in aquatic animals that exchanges gases & other dissolved substances btwn body 7 surrounding water
- often filamentous outgrowth of body surface

17

tentacle

long, thin appendage
- often used for feeling & feeding
- occurs in diff. forms in diverse animals

18

beak

structure that exerts biting forces
- associated w/ mouth
- found in birds, cephalopods & some insects

19

molting

shredding of external protective cuticle or skeleton; expansion of soft body; growth of new external layer
- method of body growth
- used by ecdysozoans

20

cuticle

protective coating secreted by outermost layer of cells of animal/plant
- fcn: decrease water loss via evaporation

21

exoskeleton

hard covering secreted on outside of body
- used for body support, protection & muscle attachment
- prominent in anthropods

22

hemimetabolous metamorphosis

animal icnrease in size from one stage to next
- no dramatic body form change
- aka incomplete metamorphosis
- hemi = half

23

holometablous metamorphosis

animal completely changes its form
- includes a distinct larval stage
- complete metamorphosis
- holo = whole

24

antennae

long appendage of head
- used to touch or smell

25

carapace

large platelike section of exoskeleton
- covers & protects cephalothorax
- crustaceans

26

cephalothorax

head chest found in crabs

27

mandible

any mouthpart used in chewing
- (vertebrate) lower jaw
- (insects, crustaceans, myriapods) 1st pair of mouthparts

28

chelicerae

pair of claw-like appendages found around mouth of certain anthropods called chelicerates

(ie) spiders, mites, allies

29

protostome importance to humans

(1) detritivores, herbivore, carnivore
(2) food source
(3) provide valuable material - silk/peral
(4) food impact - damage or protect
(5) cause or transmit human disease

30

most diverse protostome phylum + class

arthopoda insecta