Class Cestoda and Class Monogenea (handout)

cestus
endoparasitic
absent
tegument
microthrices

Class Cestoda

- Latin _______, a girdle
- All are ____________
- Include the very familiar tapeworms
- Gut completely _________, the nutrient being absorbed through the surface of the body
- Adult have nonciliated epidermis called _______ with microvilli (_________) to increase absorptive area for this parasite that lacks digestive tract.

suckers
bothria
bothridium
rostellum
scolex

Class Cestoda

- Attachment organs in the form of _________, sucking muscular grooves or folds (_______), semi circular or leaf-like _________ sometimes armed with tentacles, or hooks (_________) nearly always present at the _________ (head) (Fig. 5.7) and are important features for identifying species.

neck
proglottids
gravid proglottid

Class Cestoda

- The body region behind the scolex is the ______, which is a zone of active cell proliferation that will give rise to _______ resulting to pseudometameric strobila). Immature proglottids develop into mature stage as male and female organs develop
- Self and cross-fertilization may occur.
- Fertilization may happen within proglottid, between proglottids, or cross-fertilize between two worms. Each ____________ may contain around 50,000 eggs

Pseudometamerism
strobilization
true metamerism

Class Cestoda

- ________________ does not correspond to metameric segments of the other phyla.
- As new proglottids are produced at the neck region in a process called _____________ (~strobilation or proglottidization), the older segments are moved further from the scolex.
- In ________________, new segments (except for the first segment bearing the anus) are produced distally from the head region.

Subclass Cestodaria
Subclass Eucestoda

Two subclass under class cestoda

subclass Cestodaria

Cestodes who do not strobilate belong to small group of

subclass Eucestoda

Majority strobilate and they belong to

subclass Eucestoda

the true cestodes

complex

Class Cestoda

Life cycle is ___________ (requiring more than one host)

Apolysis
Pseudoapolysis
Anapolysis

Several ways by which the eggs are released

Apolysis

Several ways by which the eggs are released

- gravid proglottids are detached singly or in chains and the eggs are set free by disintegration of the gravid proglottids

Pseudoapolysis

Several ways by which the eggs are released

- chains of exhausted proglottids are detached after egg production has ceased

Anapolysis

Several ways by which the eggs are released

- there are provisions for the release of eggs such as the uterine pore.

ectoparasites
simple
host-specific
oncomiracidium
cilia
eyes

Class Monogenea

- Typically _______________
- Life cycle __________ (no asexual multiplication) and does not require an intermediate host.
- Monogeneans are ____________ and confined only to a unique site on the host.
- Free-swimming larva is called an ________________, bearing 3 bands of ______ and usually 1 or 2 pairs of _______

opisthaptor

The most prominent morphological feature of monogeneans is a posterior attachment organ called _______________.

prohaptor

Class Monogenea

There is also an anterior sucker called a _________, consisting of suckers and adhesive glands to aid in attachment to its host

opistho
hapto

Opisthaptor come from the Gk words
(G: _________behind or at the rear;
_________ = fastened)