Annelida Flashcards
metamerism
segmentation of annelids
pygidium
extreme posterior end, bearing anus and some cerri
chaetae
chitinous bristle or setae
gonochoristic
proliferate gametes from peritoneum and develops in the coelom
aciculae
stout internal chaetae which muscles insert and operate
biramous parapodia
Dorsal notopodium and ventral neuropodium
chloragogenous tissue (2)
tissue within the coelom pressed tightly against the visceral peritoneum
of the intestinal wall and typhlosole
Site of intermediary metabolism
rope ladder nerve cord
two close cords with segmental ganglia
nuchal organs
ciliated pits used for chemosensory
epitoky (2)
production of sexually reproductive worm (epitokous individual)
Arises from atokous (nonreproductive) animal by transformation or asexual reproduction
Which habitats have annelids failed to invade?
annelids are found in all habitats
What do branchiobdella contain?
contains the
genus and many of the taxa underneath the order are symbionts that live on crayfish, crabs, and
isopods and sometimes in their gills.
How do branchiobdella become symbionts? (2)
Their sucker on their posterior end allows them to connect to
their hosts,
they then consume detritus and other organic matter that lands inside the host or inside
their gill cavities.
Where are sipuncula called?
peanut worms
WHere are peanut worms found? (3)
Some are found burrowed in sand, mud, clay, rocks, corals, wood, and dead whales
-
Most common in tidal flats, and sensitive to low salinities
How large can peanut worms get?
1 cm to 2 feet long
what are Palola viridis called?
palolo worms
WHere are Palolo worms found? (2)
Found in shallow water in coral rubbl
How do Palola worms spawn?
Mass spawns triggered by the waning moon, with the tail being destroyed by sunlight
What are Sabellidae called?
feather-duster worms
Where are feather0duster worms found? (2)
Various marine habitats, from coral reefs rocky marine ecosystems, tide pools,
and shallow water; Atlantic, Indian, and Pacific Ocean
-
Builds tubes between rocks or coral crevices
What is the body plan of feather-duster worms?
sedentary tube worms with smooth body segments and no parapodia
What are Spirobranchus giganteus called?
christmas tree worms
Where are christmas tree worms found?
found in coral reefs in the Indo-Pacific region to the Caribbean
fun facts of christmas tree worms (2)
They are also epibionts for a clam species in Thailand
What are Riftia pachyptila called?
giant beard worm
Where are giant beard worms found (2)
Common in the Pacific ocean, in environments of high temperature, pressure, and toxic minerals
how are giant beard worms symbionts?
chemosynthetic bacteria enters young worm’s mouth, which is then sealed in the gut to
form a symbiotic relationship
What are Echiura worms called?
spoon worms
Where are spoon worms found? (3)
exclusively marine, common in the Atlantic ocean;
infaunal, found in burrows in
the intertidal zone, benthic or shallow subtidal zone;
some can be found in coral heads or rock crevices, as
well as in dead sand dollars
How are spoon worms derived annelid worms?
lost segmenation
What are sea mouse called, and what does the fur do?
This is an Amphinomidae, or fireworms, which have complanine as its “fur.
” Complanine is an
ammonium salt that can cause inflammation on contact. It is most likely used as defense.
Are segments variable in Lumbricus?
no, they are constant
