21 phylum clitellata Flashcards
what do phylum clitellata all share
clitellum
what groups are part of clitellata
oligochaetes and hirudinea
how many chaetae do hirundinea have vs oligochaetes
hirudinea great majority have none,
oligochaetes have few
spp oligochaetes
7500
oligochaetes habitat
terrestrial and freshwater
oligochaetes diet
detrivores
what type of segments do oligochaetes have
homonomous
what does homonomous
relatively simmilar segments
do oligochaetes show lots of modifications
few modifications to head or body
do oligochaetes have parapodia? describe the chaetae
chaeta are they are short and inconspicuous
they dont have parapodia
what type of movement does oligochaetes demonstrate
peristaltic movement- accordion like
what muscles work when oligochaetes move
longitudinal and circular muscles that extend to narrow body and contract to thicken the body
In oligochaetes which muscle causes shortening in thge body
circular muscles
In oligochaetes which muscle causes elongation in thge `body
longitudinal muscles
when are chaetae exended oligochaetes
when longitudinal muscles contract, help gain traction
what type of cavity do oligochaetes have
eucoelomic cavities
what type of circ syst oligochaetes
closed
sexes in oligochaetes
hermaphroditic
how is sperm transfered oligochaetes
copulation
difference in gonads oligochaetes vs polychaetes
gonads are permanent in oligochaetws
where is asexual reproduction common in oligochaetes
BUDDING in freshwater species
what type of development oligochaetes
direct
what type of larva oligochaetes
no trochophore
where is fertilization
external
what do some species use for copulation
some use penises and some use external sperm grooves
what does clitellum produce
proteinaceous ring that acts as cocoon
how does proteinaceous ring act like cocoon
first eggs are excruded onto cocoon then sperm is extruded onto eggs
what is cocoon resistant to
drying
how do oligochaetes feed
via direct deposit feeding or eat leaf litter
what is class hirudinida
leeches
hirudinida spp
700
hirudinida habitat
mostly freshwater, some marine and terestrial
how many segments hirudinida
34 true segments
what do hirudinida have on anterior and posterior
suckers
hirudinida sexes
hermaphroditic
what describes coelom of hirudinida
not compartmentalized, reduced to narrow channels and body cavity filled w resilient spongy tissue
what muscles flatten out body
dorsoventral muscles
how do hirudinida move
inchworm fashion
what are some blood feeding adaptations hirudinida
pumping pharynx
anticoagulant and anaesthetic
how do some other hirudinida feed
some are predatory
how does fertilization happen hirudinida
internal, through penis or traumatic insemination
what role does cocoon have in hirudinida fertilization
cocoon recieves zygots or embryos
some leeches hang onto cocoons and brood babies
class of leech w oinly one sucker
acanthobdellida
what characterizes acanthobdellida
oinly one sucker
have some chaetae
what do acanthobdellida feed on
bl;ood feeding parasites of fish
what class of leech is associated w crayfish why?
branchiobdellida
possible cleaning symbiosis mutualists
branchiobdellida suckers and chaetae
both anterior and posterior suckers
no chaetae
ecological end economic importance of annelida
soil fertility
plant growth
food
compositng and medicine
importance of annelida for paracites
hosts for myxozoans
