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Ch 17
annelids and allied taxa
24
Biology
Undergraduate 4
10/11/2014

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Term
Phylum Annelida
Definition
Segmented worms
Bristleworms
earthworms
leeches
Term
Phylum Sipuncula
Definition
non-segmented worms
Term
Do annelids exhibit metamerism?
Definition
Yes
Term
Characteristics of annelids and sipunculans
Definition
Coelomate, lophotrochozoan, protostomes
Term
annuli
Definition
Circular grooves between segments
Term
setae
Definition
Tiny Chitinous bristles
Term
what is the purpose of short setae?
long setae?
Definition
Short: anchor segments during movement
Long: help aquatic species swim
Term
prostomium and peristomium
Definition
2 parts of annelid head
Term
Pygidium
Definition
Last segment of an annelid; new metameres form here.
Term
hydrostatic skeleton
Definition
the fluid that fills the coelom of annelids
Term
The three Classes of Annelids
Definition
Polychaetes
Oligochaetes
Leeches
Term
Polychaetes
Definition
worms with many setae and parapodia
Term
Oligochaetes
Definition
worms with no parapodia, few setae and clitellum
Term
Leeches
Definition
worms with clitellum
Often parasitic
Term
Errantia
Definition
large group of freely moving worms
Term
Sedentaria
Definition
group of sedentary worms, live in tubes or burrows
Term
Chaetopteridae
Definition
Parchment worms
live in tubes buried in sand
Term
Prostomium
Definition
retractible, has eyes, tentacles and sensory palps
(one of the heads)
Term
Peristomium
Definition
may have setae, palps or chitinous jaws
(one of the heads)
Term
Nuchal organs
Definition
ciliated sensory pits (chemoreceptors)
Term
Are annelids normally monoacious or Dioecious?
Definition
dioecious
Term
do annelids have permanent sex organs?
Definition
No, gonads appear temporarily
Term
atoke
Definition
sexually immature
Term
epitokes
Definition
the segments that become sexually mature and break off during swarming period
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