Bio 121a Chapter 11 Annelids
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62 Terms
what does metmurism mean
when a animal body posses repeating body segment, that each have their own;
Musculature
Nervous
Circulatory
Reproduction and,
Excretion System
Are annelids protostomes or deuterstomes
protostomes
are annelids triploblastic or diploblastic
triploblastic
what type of symetry do annelids posses
bilateral
what type of ceolomate are annelids
coelomates they posses a true coelom
Do annelids moult?
No they are non-moulting (Lophotrochozoa)
annelids have one or more pairs of what structure?
setae
what are setae
chitin bristles
Each metamuristic segment contains its own ______
coelom
which segments in metamuristic animlas are Not identical
segments like brain and heart
what type of circulation do annelids have
closed circulation
where are the hearts located in annelids
anteriorly
where are the annelid blood vessels located
Dorsal and Ventral
What type of gut do Annelids have
a complete gut (with different compartments)
Where are thr brain (concentrated nevre cord) located in bannelids
ventrally
Which class of annelid posseses simple eyes
polychaetes
What are annelid sensory bristles made of
chitin
What are metanephridia in annelids
annelid simple kidneys
where are the metanephridia located in annelids
in each segment
What is the most common form of annelid reporduction
simultaneous hermaphrodism
What class are marine segmented worms
class Errantia
ex Polychaete
which class of annelid are predators and scavengers
class errantia
which class of annelid are free-living and active swimmer
class errantia
What three parts are class errantia divided into
Head
Trunk
Tail
what is the head of class erranta and marine tube worms composed of
1st segment prostomium (primary sensory organ)
2nd segment peristomium (for feeding)
what is the PYgidium
the fused segment at the end Tail of class errantia of annelids
what are parapodia
triangular appendages on each segment of class errantia
what are on the ends of parapodia
setae
(this is in class errantia)
what are these called
they are proteinaceous scales present on scale worm which are part of class errantia
what structures do class errantia use to feed
an erevirsable parynx with chitonous jaws
how do class errantia swim
via undulations and rowing with parapodia
what are freshwater or marine tube-dwelling segmented worms
class sedentaria
which class of annelid are Hematophagous, Predatory, scavengers orrr suspension feeders
class sedentaria
what is the shared feature found in earthworms and leeches, that is not found in other sedentaria
the clitelllum
what is the clitellum
a thick band of tissue used for reproduction
secretes mucus
(secret in leeches)
what comes before the clitellumin a class sedentaria
heart
gonads
mouth
pharynx
crop
brain
what comes IN EACH BODY SEGMENT after the clitellumin class sedentaira
gut portion
paired METAnephridium
ventral nerve cord
dorsal nerve cord
ventral vessle
dorsal vessel
what bioturbates when feeding
earthworms
why do earth worms end up removing alot of valuable nutrients
because some are invasive
What has external segmentation but NO internal segmentation (NO DUPLICATED ORGANS)
leeches
WHat are hematophagous
leeches they eat blood
where is blood stores in leeches
in the crop
what do leeches secrete to prevent clotting
hirudin
Do marine tube worms posses a clitellum
NO
what body layers do marine tube worms have
head
trunk
what annelid has the corwn of feeding tentacles at the top of its head
marine tube worms from class sedentaria
what class are marine segmented worms
class sipuncula
what class of annelid are scavengers and suspension feeders
class sipuncula
what is an introvert
an inverted pharynx
imgine rolling sock downleg
are class sipuncula segmented
they are segmented at first but segmentation is lost as adult
what is on the end of an introvert on class sipuncula
a corwn of tentacles for feeding
What is a fun variation of INtroverts in class sipuncula
introverts can be striped
where can you find class sipuncula
in the intertidal or shallow water
which class of annelid is found buried in sediment with tip of _____ sticking out
class sipuncula they introvert sticks out
what class of annelid has U-shaped gut
class sipuncula
runs; pharynx—→ posterior—→anterior
what type of gut does class sipuncula have
complete gut
where is the anus located in class sipuncula
towards the top of the animal
what animal has similar excretion sturctures to class sipuncula
rotifers
what class of annelid has paired Nephridia down each side of the body
class sipuncula
which class of annelid empties its waste via a Nephridiopore
class sipuncula nephridiopore near anus
what nervous system structures do class sipuncula have
a true brain with a well-defined ventral nerve cord
what are nuchal organs
chemosensory structures on the dorsal side of the introvertin class sipuncula
