Platyhelminthes

Question 1

Bilateria

Answer 1

platyhelminthes assumed to be basal bilateria, having bilateral symmetry

Question 2

acoelomate

Answer 2

have ectoderm, mesoderm, and endoderm but no hollow body cavities

Question 3

protonephridia

Answer 3

excretory system of flatworms, complex of flame cells and their associated nephridiopore

Question 4

flame cells

Answer 4

part of excretory system, have flagella, flagella moves body fluids along

Question 5

Turbellaria

Answer 5

“whirlpools”
16% of flatworms, 4500 species, free-living, most aquatic, benthic(live on bottom of water/streams), various body shapes, uniquely have rhabdites

does not have anus, respiratory system, circulatory system

Question 6

Cestoda

Answer 6

“tapeworms”

endoparasitic flatworms, tegument neoderm(syncytial); has scolex, proglottids, no gut

Question 7

Monogenea

Answer 7

“1 birth”

ectoparasite, 1 host, highly host specific, subgroup of Trematoda, attach to host by haptors, causes lots of fish diseases

Question 8

Trematoda

Answer 8

flukes, all parasites, largest group (11,000 species), 2nd largest metazoan group

parasitic flatworms, two subgroups mongenes and digenes

Question 9

parenchyma

Answer 9

makes up the true mesoderm as platyhelminthes

(not same thing as plants)

Question 10

rhabdites

Answer 10

unique cells found in Turbellaria, found in rhabdite glands, mucuos coating created for locomotion

Question 11

paratomy

Answer 11

asexual reproduction in Turbellaria, organisms split in plane perpendicular to antero-posterior axis; can develop in head to tail fashion

forms new organs before fission

Question 12

architomy

Answer 12

a type of asexual reproduction in turbellaria, is fission before formation of new organs

Question 13

neoblasts

Answer 13

adult stem cells (found in planarian flatworms)

only dividing cells in planaria, produce all cell types

allow for regeneration

Question 14

scolex

Answer 14

head of the adult tape worm (Cestoda)

adapted to attach to intestinal tract of host with its hook complex

Question 15

proglottid

Answer 15

addtionally added segments to the body of an adult tape worm (Cestoda)

full of fertilized eggs, ready to shed into feces)each segment has reproductive organs)

larval stages can live in muscle after being passed into the environment and swalled by others

occurs from improper food handling

Question 16

Taenia

Answer 16

in cestoda, endoparasite

tegument-neoderm(syncitial - outer tegument 1 cell)

contains scolex, proglottids, no gut

adult tapeworm that infect humans from ingesting poorly prepared meat

Question 17

definitive host

Answer 17

always vertebrates, host parasitic flatworms, first host of worm

Question 18

hermaphrodite

Answer 18

include both testes and ovaries within reproductive system, produces male and female gametes