Phyla Annelida

Question 1

hydrostatic skeleton

Answer 1

muscles working in conjunction with water pressure

Question 2

setae

Answer 2

bristles four on the body segments

Question 3

crop

Answer 3

food storage area found in annelids

Question 4

gizzard

Answer 4

digestive organ for grinding food prior to absorption

Question 5

clitellum

Answer 5

reproductive structure found on outside of earthworm

Question 6

ventral vessel

Answer 6

blood vessel located on underside of earthworm

Question 7

arotic arches

Answer 7

hearts of earthworms

Question 8

annelids

Answer 8

segmented worms

Question 9

nephridia

Answer 9

excretory organs that filter fluid of nitrogenous wastes in coelom

Question 10

phylum annelida

Answer 10

refers to “little ring” and worms body segments. segmented separated by septa - internal walls between. segments may have specialized functions. sensory - eyes, respiration, many annelids have setae on segments bristles. have true coelom.

Question 11

feeding and digestion

Answer 11

range from filter feeders to predators. carnivores pieces, nereis, have sharp jaws in pharynx. detritivores have mucus in pharynx. earthworms pump food and soil into esophagus - crop (food storage) - gizzard (grind food) - digestive tract for absorption.

Question 12

circulation

Answer 12

closed circulatory system, blood contained in a network of blood vessels. BLOOD NEVER LEAVES THE VESSELS

Question 13

respiration

Answer 13

aquatic annelids have gills. earthworms diffuse gases through moist skin.

Question 14

excretion

Answer 14

waste exits body through the anus. nitrogenous wastes in cells removed through nephridia, excretory organs that filter fluid in coelom.

Question 15

response

Answer 15

well-developed nervous system with brain and several nerve cord. variety of adaptions for detecting stimuli: sensory tentacles, chemical receptors. statocysts to detect gravity and two or more pairs of eyes.

Question 16

movement

Answer 16

longitudinal muscles and circular muscles for hubristic skeleton. marine annelids have parapodia - paddle-like appendages for crawling and swimming.

Question 17

reproduction

Answer 17

sexual reproduction, external or internal fertilization depending on species others are hermaphoditic. some have self-fertilization.

Question 18

class oligochaete

Answer 18

earthworms and relatives, streamlined bodies, few setae. live in soil or fresh water.

Question 19

class hirudinea

Answer 19

contains ledges, external parasites that suck blood and body fluids from host. approximately 1/4 of leeches are carnivorous feeding on small invertebrates. powerful suckers.

Question 20

ecology of annelids

Answer 20

earthworms aerate soil, loosen soil for plant growth. decomposers and prey animals for birds, reptiles and fish.

Question 21

pharynx

Answer 21

muscular tube connecting the mouth to the esophagus