Annelida

Question 1

metamerism

Answer 1

segmentation of annelids

Question 2

pygidium

Answer 2

extreme posterior end, bearing anus and some cerri

Question 3

chaetae

Answer 3

chitinous bristle or setae

Question 4

gonochoristic

Answer 4

proliferate gametes from peritoneum and develops in the coelom

Question 5

aciculae

Answer 5

stout internal chaetae which muscles insert and operate

Question 6

biramous parapodia

Answer 6

Dorsal notopodium and ventral neuropodium

Question 7

chloragogenous tissue (2)

Answer 7

tissue within the coelom pressed tightly against the visceral peritoneum
of the intestinal wall and typhlosole

Site of intermediary metabolism

Question 8

rope ladder nerve cord

Answer 8

two close cords with segmental ganglia

Question 9

nuchal organs

Answer 9

ciliated pits used for chemosensory

Question 10

epitoky (2)

Answer 10

production of sexually reproductive worm (epitokous individual)

Arises from atokous (nonreproductive) animal by transformation or asexual reproduction

Question 11

Which habitats have annelids failed to invade?

Answer 11

annelids are found in all habitats

Question 12

What do branchiobdella contain?

Answer 12

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.

Question 13

How do branchiobdella become symbionts? (2)

Answer 13

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.

Question 14

Where are sipuncula called?

Answer 14

peanut worms

Question 15

WHere are peanut worms found? (3)

Answer 15

Some are found burrowed in sand, mud, clay, rocks, corals, wood, and dead whales
-
Most common in tidal flats, and sensitive to low salinities

Question 16

How large can peanut worms get?

Answer 16

1 cm to 2 feet long

Question 17

what are Palola viridis called?

Answer 17

palolo worms

Question 18

WHere are Palolo worms found? (2)

Answer 18

Found in shallow water in coral rubbl

Question 19

How do Palola worms spawn?

Answer 19

Mass spawns triggered by the waning moon, with the tail being destroyed by sunlight

Question 20

What are Sabellidae called?

Answer 20

feather-duster worms

Question 21

Where are feather0duster worms found? (2)

Answer 21

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

Question 22

What is the body plan of feather-duster worms?

Answer 22

sedentary tube worms with smooth body segments and no parapodia

Question 23

What are Spirobranchus giganteus called?

Answer 23

christmas tree worms

Question 24

Where are christmas tree worms found?

Answer 24

found in coral reefs in the Indo-Pacific region to the Caribbean

Question 25

fun facts of christmas tree worms (2)

Answer 25

has two crowns shaped like Christmas tree - They are also epibionts for a clam species in Thailand

Question 26

What are Riftia pachyptila called?

Answer 26

giant beard worm

Question 27

Where are giant beard worms found (2)

Answer 27

found in the ocean floor near hydrothermal vents - Common in the Pacific ocean, in environments of high temperature, pressure, and toxic minerals

Question 28

how are giant beard worms symbionts?

Answer 28

chemosynthetic bacteria enters young worm’s mouth, which is then sealed in the gut to form a symbiotic relationship

Question 29

What are Echiura worms called?

Answer 29

spoon worms

Question 30

Where are spoon worms found? (3)

Answer 30

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

Question 31

How are spoon worms derived annelid worms?

Answer 31

lost segmenation

Question 32

What are sea mouse called, and what does the fur do?

Answer 32

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.

Question 33

Are segments variable in Lumbricus?

Answer 33

no, they are constant