Chapter 4 page 5

Question 1

Tick Paralysis:

Answer 1

A # of Iodide ticks cause a condition known as tick paralysis.

Question 2

Tick paralysis has been described in a wide range of animals including

Answer 2

humans, cats, dogs, sheep, birds, and even snakes.

Question 3

Ticks gain no benefit from killing their host and paralysis often

Answer 3

does not develop until after the tick has engorged.

Question 4

Host have no co-evolved with the tick, some of the components of tick saliva

Answer 4

may induce a particularly harmful reaction.

Question 5

In humans, tick paralysis tends to affect children more than adults although this may be a reflection

Answer 5

of their tendency to play and roll around in field where they are likely to be bitten by ticks.

Question 6

Infected person becomes unsteady and

Answer 6

flaccid paralysis and extends symmetrically to affect the other muscles that bring about eye movements (ophthalmoplegia)

Question 7

Tick paralysis usually causes paralysis of the

Answer 7

extraocular muscles that bring about eye movements (ophthalmoplegia)

Question 8

Phylum Crustacea:

Answer 8

1) 40,000 species
2) diverse and found in every marine, brackish, and freshwater environment but ( few species are terrestrial)
3) many unusual parasites that afflict other aquatic invertebrates or fish( little economic or medical importance).

Question 9

Subclass Copepoda:

Answer 9

1) Copepods are the most abundant metazoan animals in the oceans and huge # also occur in freshwater.
2) regions of 1600-1800 species of parasitic copepod species infest animals ranging from sponges to whales.

Question 10

**75% parasitic copepods belong to a single order

Answer 10

the Siphonostomatoida**

Question 11

Single animal during their life belongs to the family

Answer 11

Pennelidae have a unique life cycle that includes intermediate host and a definitive host.

Question 12

Most copepods are small and

Answer 12

one free-living species approaches a length of 2 cm and some parasitic forms are over 32 cm.

Question 13

Parasitic copepod:

Answer 13

Ommatokoita elongata and the Greenland shark: Somniosus microcephalus.

Question 14

Parasitic copepod Pennella balaenopterae

Answer 14

that are parasitic to WHALES grow to 32cm.

Question 15

Free-living species of copepod:

Answer 15

Mesocyclops longisetus, control agent for the larvae of mosquitos, such as Aedes aegypti a vector for dengue fever and yellow fever.

Question 16

Infraclass Cirripedia:

Answer 16

• Cirripedia includes barnacles (only sessile group of crustaceans).
• Rhizocephala mainly parasites decapods crustaceans(crabs and lobsters)