Phylum Platyhelminthes

Parasite

• lives in water

• lives in dirt

• lives in or on another organism

• lives a full life

Host

• organism that the parasite lives in or on that provides nutrition and a place to live

• organism that throws a good party

• provides employment opportunities

• organism that kills parasite

Tags

NGSS.MS-LS2-3

Bilateral symmetry.

• arranged around a central point

• no definite shape

• mirrored halves when divided along any plain

Most flatworms are?

• hosts

• asymmetrical

• parasites

• scavengers

Phylum Platyhelminthes?

• roundworms

• segmented worms

• aquatic worms

• flatworms

Tags

NGSS.MS-LS4-2

3 tissue layers.

• quadroblastic

• diploblastic

• triploblastic

• monoblastic

Acoelomate.

• have a true body cavity filled with organs

• body cavity filled with water

• gastrovascular cavity

• body cavity is mesodermal tissue filled with parenchyma, has organs

Parenchyma.

• loose connective tissue, fills body cavity of acoelomates

• muscular tissue

• cardiac tissue

• water

Tags

NGSS.HS-LS2-5

Three tissue layers.

• ecotoderms, middlederm, epidermis

• ectoderm, mesoderm, endoderm

• kiloderm, mesoderm, ectoderm

• epiderm, quadroderm, endoderm

Tags

NGSS.HS-LS1-2

Has definite head region at anterior end, sense organs and nervous control concentrated at anterior end.

• acoelomate

• triploblastic

• bilateral symmetry

• cephalization