Who Hosts Whom?
One Cell, Many Tricks
Flat but Fearsome
Segments, Suckers & Spikes
Hooks, Hormones & Hard Shells
100

Host that supports clonal amplification but not sexual reproduction.

What is an intermediate host?

100

Environmentally resistant transmissive stage.

What is a cyst?

100

Posterior attachment organ of monogeneans.

What is the opisthaptor?

100

Germinative zone producing all cestode proglottids.

What is the neck?

100

Fixed adult somatic cell number in nematodes.

What is eutely?

200

Host that supports partial development but prevents onward transmission.

What is an accidental host?

200

Adhesion-based motility system of apicomplexans.

What is the glideosome?

200

Syncytial, metabolically active body covering of parasitic platyhelminthes.

What is the tegument (neodermis)?

200

Linear chain of reproductive segments forming the cestode body.

What is the strobila?

200

Fluid-filled cavity providing hydrostatic support in nematodes.

What is the pseudocoelom?

300

Host that accumulate parasites, but no development or reproduction takes place.

What is a paratenic host?

300

Asexual division producing many daughter cells from one parent cell.

What is multiple fission?

300

Free-swimming digenean larva infective to molluscs.

What is a miracidium?

300

Hair-like tegumental projections enabling nutrient uptake in tapeworms.

What are microtriches?

300

Arthropod feeders that repeatedly switch hosts rather than remaining attached.

What are micropredators?

400

Transmission explicitly driven by predator–prey interactions.

What is trophic transmission?

400

Pulsating vesicle responsible for osmoregulation in many protists.

What is the contractile vacuole?

400

End product of digenean polyembryony that exits the snail host.

What is a cercaria?

400

Fluid-filled canal system within the hypodermis of the body wall of acanthocephalans.

What is the lacunar system?

400

Barbed anchoring structure in ticks.

What is the hypostome?

500

This animal (common name) serves both as vector and definitive host for Plasmodium spp. parasites.

What is the mosquito?

500

Temporary nuclear exchange between protists without full cellular fusion.

What is conjugation?

500

Ventral saucer-shaped attachment organ of digeneans.

What is the acetabulum?

500

Larval stage of cestodes that develop in a crustacean (first intermediate host) and are infective to fish (second intermediate host).

What is the procercoid?

500

Arthropod developmental transformation mediated by successive molts.

What is metamorphosis?