(F) Cestodes - lesson 1 (lecture-based) Flashcards
- flat
- ribbon like chain
- can reach lengths up to 10m or more and have hundreds of segments
- Each segment releases thousands of eggs
Cestodes
Cestode AKA
tapeworms
They have ribbon like chain segments called?
proglottids
The whole segment is called
Gravid
STROBILA
Enumerate the basic structure of a cestode
o Scolex (head)
o Neck region
o Immature proglottids
o Mature proglottids
o Gravid proglottids
2 TYPES OF TAPEWORMS
Pseudophyllidean & Cyclophyllidea
PSEUDOPHYLLIDEA or CYCLOPHYLLIDEA
Scolex: Spatulate/ flattened spatulate
Mature proglottids: Broad/widen
Gravid proglottids: Has uterine branches that contains eggs
Eggs: Operculum (cap like) Oval in shape
PSEUDOPHYLLIDEA
PSEUDOPHYLLIDEA or CYCLOPHYLLIDEA
Scolex: Rhomboid/ quadrate
Mature proglottids: Longer Has genital pore
(contains testis, uterine, and ovaries)
Gravid proglottids: Has uterine branches that contains eggs
Eggs: No operculum Spherical in shape Presence of truncated prisms (characteristic of taenia spp.)
CYCLOPHYLLIDEA
Scolex:
- 2 ventral suckers
- rhomboid/ quadrate shape with 4 ventral suckers; also has a presence of rostellum (may or may not have hooks)
A. PSEUDOPHYLLIDEA
B. CYCLOPHYLLIDEA
A, B
PSEUDOPHYLLIDEA or CYCLOPHYLLIDEA
Mature Proglottid:
- broad and wide; has a ventral genital pore
- longer and has a lateral genital pore
A. PSEUDOPHYLLIDEA
B. CYCLOPHYLLIDEA
A, B.
Gravid proglottid:
1. more concentrated at the center
2. several branching
3. Taenia solium and Taenia saginata
4. Diphyllobothrium latum
A. PSEUDOPHYLLIDEA
B. CYCLOPHYLLIDEA
u may repeat answers
A, B, B, A
Pseudophyllidea
▪ Wider proglottid
▪ Branching of uterus
Diphyllobothrium latum
Cyclophyllidea
Uterine branches of T. solium and T. saginata
15-20, 7-13
Egg: Operculated
A. PSEUDOPHYLLIDEA
B. CYCLOPHYLLIDEA
A
Solid form of Larva (2)
Procercoid & Plerocercoid