Cestodes

Question 1

Morphology of tapeworms

Answer 1

hermaphroditic
always endoparasitic adults in GI tract, larval extra intestinal
adults lack body cavity and digestive tract. take in nutrients or food by absorbing nutrients through body
muscular system

Question 2

morphology of cyclophyllidea

Answer 2

scolex head with four sucks called acetabula. scolex can be armed or have hooks or rostellum (restractable nose) with back facing hooklets. can be unarmed. used to anchor- holdfast organ.
short unsegmented neck. germinal region.
strobila body. proglottids make it up.
farther from scolex more mature.
immature proglottid
mature- sex
gravid proglottid.-degenerated sex organs. uterus distended with eggs. become detached. seen in feces.
proglottid has complete excretory system and nervous system, 1-2 sets of female and male organs

Question 3

cyclophyllidea

Answer 3

true tapeworms

dipylidium, taeniid tapeworms

Question 4

psuedophyllieda

Answer 4

psuedotapeworms, spirometra mansonoides, diphyllobothrium spp.

Question 5

development of cyclophyllideans

Answer 5

adult in intestine of DH
eggs (oncosphere, hexacanth embryo), or proglottid containing egg in feces
eggs in environment embryonate. 3 pairs of hooklets. IF. penetrate intestinal wall. developinto larval tapeworm- metacestode.
metacestode contains one or more scolex.