Lecture 21

Question 1

Clade bilateria traits?

Answer 1

Bilateral symmetry
Varying cephalization
Triploblastic

Question 2

Phylum Acoela traits?`

Answer 2

Acoelomate
Flat minimal cephalization
no anus or gut instead has endocellular digestion

Question 3

Clade Lophotrochozoa?

Answer 3

18 phyla
Simple and complex
Polytomy

Question 4

Platyhelmintes?

Answer 4

Flatworm
Acoelomate (triploblastic however)
No circ/gas exchange system
Do not have anus 
Predatory
surface of body covered in cilia (motility)

Question 5

Class cestoida (platyhelminthes?)

Answer 5

tapeworms
Endoparasitic
No digestive system

Question 6

Scolex: front end of body modified for holding onto host gut

Answer 6

yes

Question 7

Proglottids?

Answer 7

Long chain of units devoted to reproduction

Question 8

Protoglottids produced at?

Answer 8

new ones= base of scolex

Old ones = toward posterior

Question 9

Tapeworm life cycle

Answer 9

egg consumed by intermediate host
develop into larvae that encyst in IH tissue
IH eaten by definitive host
Larvae develops in gut of DH

Question 10

Intermediate host?

Answer 10

parasite undergoes asexual reproduction (usually invertebrate)

Question 11

Definitive host?

Answer 11

In which parasite undergoes sexual repro (usually vertabrate)

Question 12

Taenia spp?

Answer 12

tapeowrm found after eating undercooked pork or beef

Question 13

Diphyllobothriumlatum

Answer 13

Tapeworm found after eating raw fish

Question 14

Class trematoda (platyhelmintes)?

Answer 14

Feed on host tissue and blood
simulatenous hermaphrodites
2 or more hosts

Question 15

Annelida phylum?

Answer 15

Segmented worms include classes polychaeta, oligochaeta, and hirudinea

Question 16

Annelid characteristics?

Answer 16

Segmented separated by internal septa
Eucoelomate 
Closed circ. system
gas exchange via diffusion
Has anus

Question 17

Polychaeta?

Answer 17

Marine
parapodia have chaetae
Differentiated head with antenna

Question 18

Sedentary?

Answer 18

rarely move

Question 19

errant?

Answer 19

can move

Question 20

Polychaetes are usually?

Answer 20

predators

Question 21

suspension feed?

Answer 21

filter food particles out water column

Question 22

deposit feed?

Answer 22

trail sticky tentacles over substrate and licking off adhering matter

Question 23

Free spawning?

Answer 23

eggs and sperm released into water

Question 24

Oligochaeta?

Answer 24

Morphologically and ecologically much less diverse than polychaetes
Lack parapodia and head
terrestrial and freshwater
Simultaneous hermaph

Question 25

Class hirudena?

Answer 25

related to oligochaetes 
Lack chaetae
Use suckers for locomotion
preds of soft invertabrates
Some feed on vertebrate blood