Ectoparasite Basics 3

Question 1

Pentastomida (Tongue Worm) Morphology

Answer 1

Pleomorphic: changes throughout its development

Question 2

Phyla and Class of Leeches

Answer 2

Phyla: Annelida
Class: Hirudnean

Question 3

Morphology of the Leech (Hirudnean Annelida)

Answer 3

Segmented (worm-like) with a thin, flexible cuticle.

Question 4

Leeches have Ventral Suckers. How many?

Answer 4

1. Anterior (surrounds the mouth)
2. Posterior (Large & Adhesive)

Question 5

Leeches move in what 2 ways?

Answer 5

“Stepping” with their Ventral Suckers
or Swimming

Question 6

Are Leeches Hermaphroditic or Dioecious?

Answer 6

Hermaphroditic

Question 7

How do leeches attach to their host?

Answer 7

With their anterior sucker and 3 rows of teeth.

Question 8

Although leeches are Hermaphroditic, they do not self-fertilize. They transfer sperm during a process called _______.

Answer 8

Simultaneous Fertilization

Question 9

What naturally occurring substance in the saliva of leeches has anticoagulant properties?

Answer 9

Hirudin

Question 10

Blood ingestion by leeches can have both pathologic and beneficial effects. What is one pathologic effect and one beneficial effect?

Answer 10

Pathological: Anemia

Beneficial: Bloodletting (removing venous blood in areas with venous damage)