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ZOOL 250 lectures 13-28 > lecture 19- annelida > Flashcards

lecture 19- annelida Flashcards

1
Q

what is phylum annelida

A

segmented worms

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2
Q

segmentation

A

division of at least part of the body into series of relatively similar repeated unitsw

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3
Q

what does segmentation involve

A

metamerism and tagmatization

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4
Q

metamerism

A

addition of new segments bw most recently made segment and prosteriorly located growth zone

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5
Q

tagmatization

A

tagmata that perform particiular functions and are morphologically distinct

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6
Q

did segmentation arise from common ancestor of annelida and arthropoda?

A

no, it was thought to have been but morphological data show it arose independently

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7
Q

homonomous

A

body composed of segments that look almost identlical

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8
Q

heteronomous

A

body composed of clusters of segments morphologically specielized

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9
Q

how many spp phylum annelida

A

20000

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10
Q

annelida habitat

A

marine freshwater and terrestrial

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11
Q

three classes of annelida

A

polychaeta- most marine
oligochaeta- earthworm and freshwater
hirudinea- leeches

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12
Q

what does phylum clitellata share

A

clitellum

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13
Q

what is the development of annelida

A

protostome like, blastospore becomes mouth
spiral cleavage
schizocoelous development of coelom

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14
Q

what type of larva do marine annelida have?

A

trochophore

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15
Q

what type of gut annelida

A

complete, with terminal anus

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16
Q

what does each segment have

A

eucoelomic cavity

17
Q

what is gut supported by

A

mesentaries

18
Q

what type of circ

A

closed circ system with pumping hearts

19
Q

what does blood contain annelida

A

respiratory pigments

20
Q

what tpye of nervous system shit annelida

A

-dorsal anterior ganglion (BRAIN)
-circumesophageal nerve connectives
-1-2 ventral nerve cords

21
Q

do annelids have metanephridial system?

A

most do

22
Q

what is metanephridial system

A

ultrafiltration occurs in structure separate from resoption and transport

23
Q

what lies in segment anterior to nephridial tubule/ duct w nephridiopore

A

flame cell or open funnel like nephostome

24
Q

Flame cell

A

Open Funnel like nephrostome

25
Q

What are the two consequences of metamerism in annelids

A

Functional: allow control of shape through muscular actuon
Developmental: segments develop independently

26
Q

where is mouth annelida

A

periostomium

27
Q

where is anus annelida

A

pygidium

28
Q

what lies infront of periostomium

A

protostomium

29
Q

where are new segments added

A

anterior to pygidium

30
Q

what is along body

A

chaetae, that are chitenous bristles

31
Q

what is outer layer

A

non living, noncilliated cuticle

ZOOL 250 lectures 13-28 (18 decks)

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