Lecture 15: Invertebrates II

Question 1

What is phylum nematoda?

Answer 1

round worms

Question 1

What are the features of phylum nematoda?

Answer 1

1. triploblastic
2. one way gut from mouth to anus. This means it is a alimentary canal of digestive tract.
3. Protostome which means mouth formed first and then the anus
4. Pseudocoelomate(false hollow). Also, lacks circulatory system. Also nutrients are transported through body fluid in pseudocoel. Also have hydrostatic skeleton where the worm moves through water pressure
5. Have a cuticle which is a touch external coat
6. can be free living and parasitic species

Question 2

What is a type of parasitic nematoda?

Answer 2

Trichinella spirallis which can form cysts in pork meat and cause trichinosis. Also ascaris which is a intestinal round worm

Question 2

What is a type of free living nematoda?

Answer 2

ceanohabditis elgans which lives in soil and is used for developmental biology research. Also it is transparent which helps research

Question 3

What is phylum nematomorpha?

Answer 3

Horse hairs

Question 4

What are features of phylum nematomorpha?

Answer 4

1. In adult stage they are free living. However, their larvae are parasitic arthropods

Question 5

What is phylum rotifera?

Answer 5

rotifers and mean wheel bearer

Question 6

What are features of phylum rotifera?

Answer 6

1. triploblastic
2. one way gut
3. protostome
4. bilateral symmetry
5. pseudocoelomate
6. have “corona” which is a crown of cilia to create vortex to draw food
7. have mastax which is a pharynx to grind good
8. some species have asexual reproduction(parthogenesis)

Question 7

What is parthogenesis?

Answer 7

Happens in rotifers and is a form of asexual reproduction and is when the female population does not need males or sperm to give birth

Question 8

What is phylum mollusca?

Answer 8

soft mollusks

Question 9

What are some of the features of phylum mollusca?

Answer 9

1. triploblastic
2. one way gut(alimentary canal)
3. protostomes
4. bilateral symmetry
5. coelomates(true coelom)
6. not segmented
7. have mantle which is the tissue that secretes the shell
8. have radula which is the rasping tongue
9. have ventral foot which is the muscle used for movement

Question 10

What are the classes for phylum mollusca?

Answer 10

1. gastropoda
2. polyplacophora
3. bivalvia
4. cephalopoda

Question 11

What is class gastropoda?

Answer 11

They mean stomach foot and it is the snails and slugs. They also have a subclass opisthobranchia, prosobranchia, and pulmonata.

Question 12

What is the subclass opisthobranchia?

Answer 12

They mean the gills behind the heart. They are the sea slugs and nudibranchs

Question 13

What is subclass prosobranchia?

Answer 13

It means gills in front of the heart and they are the aquatic snails.

Question 14

What is subclass pulmonata?

Answer 14

It means they have lungs and are the land snails and slugs

Question 15

What is the class polyplacophora?

Answer 15

It means many plate bearer and they are the chitons

Question 16

What is class bilvavia?

Answer 16

It means two doors and they are the oysters, clams, scallops, and mussels. In addition, they are also filter feeders

Question 17

What is class cephalopoda?

Answer 17

It means head foot and they are the octopus, squid, and nautilus. Also, they are all predators

Question 18

What is phylum annelida?

Answer 18

segmented worms

Question 19

What are some features of phylum annelida?

Answer 19

1. triploblastic
2. one way gut (alimentary canal)
3. protostome
4. bilateral symmetry
5. coelomates
6. segmented
7. have serial homology which means they have repeated segments
8. have closed circulatory system whch means blood is confined in blood vessels

Question 20

What are classes of phylum annelida?

Answer 20

1. polychaeta
2. oligocheata
3. hirudinea

Question 21

What is class polychaeta?

Answer 21

It means many hairs and they are marine worms. They also have setae which are bristles. They have no clitellum. In addition, they also have families

Question 22

What is family amphinomidae?(part of polychaeta)

Answer 22

They are bristle worms

Question 23

What is family nereididae(part of polychaeta)?

Answer 23

ragworm

Question 24

What is family serpulidae?(part of polychaeta)?

Answer 24

Christmas tree worm

Question 25

What is family aphroditidae?

Answer 25

sea mouse

Question 26

What is family siboglinidae?

Answer 26

tube worm

Question 27

What are the families in class polychaeta?

Answer 27

1. amphinomidae
2. nereididae
3. serpulidae
4. aphroditidae
5. siboglinidae

Question 28

What is class oligochaeta?

Answer 28

It means few hairs and they are earthworms. They have less setae. Also have clitellum which is the collar that forms reproductive cocoon. They also are hermaphrodites.

Question 29

What are the families of class oligochaeta?

Answer 29

1. lumbricidae

Question 30

What is family lumbricidae?

Answer 30

The common european earthworm that is now found everywhere

Question 31

What is class hirudinea?

Answer 31

Leaches. They have no setae. They have clitellum and are hermaphroditic.
They are blood sucking ectoparasite where they secrete anesthetic(don’t feel wound) and have hirudin which is an anti coagulant where the blood keeps flowing

Question 32

What is phylum nemertea?

Answer 32

Ribbon worms

Question 33

What is phylum tardigrada?

Answer 33

water bears and are very resistant

Question 34

What is phylum onycophora?

Answer 34

velvet worms. They shoot out slime to capture prey.

Question 35

What is phylum acanthocephala?

Answer 35

Spiny headed worm and infect hosts through spines