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ZOOL 250 lectures 13-28 > 21 phylum clitellata > Flashcards

21 phylum clitellata Flashcards

1
Q

what do phylum clitellata all share

A

clitellum

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2
Q

what groups are part of clitellata

A

oligochaetes and hirudinea

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3
Q

how many chaetae do hirundinea have vs oligochaetes

A

hirudinea great majority have none,
oligochaetes have few

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4
Q

spp oligochaetes

A

7500

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5
Q

oligochaetes habitat

A

terrestrial and freshwater

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6
Q

oligochaetes diet

A

detrivores

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7
Q

what type of segments do oligochaetes have

A

homonomous

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8
Q

what does homonomous

A

relatively simmilar segments

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9
Q

do oligochaetes show lots of modifications

A

few modifications to head or body

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10
Q

do oligochaetes have parapodia? describe the chaetae

A

chaeta are they are short and inconspicuous
they dont have parapodia

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11
Q

what type of movement does oligochaetes demonstrate

A

peristaltic movement- accordion like

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12
Q

what muscles work when oligochaetes move

A

longitudinal and circular muscles that extend to narrow body and contract to thicken the body

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13
Q

In oligochaetes which muscle causes shortening in thge body

A

circular muscles

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14
Q

In oligochaetes which muscle causes elongation in thge `body

A

longitudinal muscles

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15
Q

when are chaetae exended oligochaetes

A

when longitudinal muscles contract, help gain traction

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16
Q

what type of cavity do oligochaetes have

A

eucoelomic cavities

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17
Q

what type of circ syst oligochaetes

A

closed

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18
Q

sexes in oligochaetes

A

hermaphroditic

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19
Q

how is sperm transfered oligochaetes

A

copulation

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20
Q

difference in gonads oligochaetes vs polychaetes

A

gonads are permanent in oligochaetws

21
Q

where is asexual reproduction common in oligochaetes

A

BUDDING in freshwater species

22
Q

what type of development oligochaetes

A

direct

23
Q

what type of larva oligochaetes

A

no trochophore

24
Q

where is fertilization

A

external

25
Q

what do some species use for copulation

A

some use penises and some use external sperm grooves

26
Q

what does clitellum produce

A

proteinaceous ring that acts as cocoon

27
Q

how does proteinaceous ring act like cocoon

A

first eggs are excruded onto cocoon then sperm is extruded onto eggs

28
Q

what is cocoon resistant to

A

drying

29
Q

how do oligochaetes feed

A

via direct deposit feeding or eat leaf litter

30
Q

what is class hirudinida

A

leeches

31
Q

hirudinida spp

A

700

32
Q

hirudinida habitat

A

mostly freshwater, some marine and terestrial

33
Q

how many segments hirudinida

A

34 true segments

34
Q

what do hirudinida have on anterior and posterior

A

suckers

35
Q

hirudinida sexes

A

hermaphroditic

36
Q

what describes coelom of hirudinida

A

not compartmentalized, reduced to narrow channels and body cavity filled w resilient spongy tissue

37
Q

what muscles flatten out body

A

dorsoventral muscles

38
Q

how do hirudinida move

A

inchworm fashion

39
Q

what are some blood feeding adaptations hirudinida

A

pumping pharynx
anticoagulant and anaesthetic

40
Q

how do some other hirudinida feed

A

some are predatory

41
Q

how does fertilization happen hirudinida

A

internal, through penis or traumatic insemination

42
Q

what role does cocoon have in hirudinida fertilization

A

cocoon recieves zygots or embryos
some leeches hang onto cocoons and brood babies

43
Q

class of leech w oinly one sucker

A

acanthobdellida

44
Q

what characterizes acanthobdellida

A

oinly one sucker
have some chaetae

45
Q

what do acanthobdellida feed on

A

bl;ood feeding parasites of fish

46
Q

what class of leech is associated w crayfish why?

A

branchiobdellida
possible cleaning symbiosis mutualists

47
Q

branchiobdellida suckers and chaetae

A

both anterior and posterior suckers
no chaetae

48
Q

ecological end economic importance of annelida

A

soil fertility
plant growth
food
compositng and medicine

49
Q

importance of annelida for paracites

A

hosts for myxozoans

ZOOL 250 lectures 13-28 (18 decks)

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