annelid diversity

Question 1

Polychaete worms are divided into two groups

Answer 1

• those that are errant (used parapodia for locomotion, foraging)
• those that are sedentary (use parapodia (if present) for feeding currents

Question 2

for excretion, what are the differences between clitellata and polychaetes?

Answer 2

• clitellata use metanephridia
• most polychaetes used protonephridia

Question 3

Differences between metanephridia and protonephridia?

Answer 3

Metanephridia: uses later filtrations, no screen to filter out molecules

Protonephridia: uses ultrafiltration, removes useful molecules from waste fluid

Question 4

what is polychaete reproduction like?

Answer 4

• gonochoristic, with external fertilization
• has epitoky (asexual budding)
• and trochophore larva

Question 5

what are the 3 groups under polychaetes?

Answer 5

• family siboglinidae
• the echiruans
• the sipunculans

Question 6

defining characteristics under family siboglinidae?

Answer 6

• trophosome (organ that contains chemoautotrophic bacteria
• limited, posterior segmentation

Question 7

what are defining characteristics of siphunculans

Answer 7

• introvert, can be completely withindrawn inside its own body
• urns (extretory function)

Question 8

What are the defining characteristics of clitellata?

Answer 8

• clitellum, glandular region that secretes mucus
• permanent gonads

Question 9

While polychaetes are polyphyletics, clitellata are

Answer 9

monophyletic

Question 10

what are two subclasses under clitellata?

Answer 10

• oligochaeta (earthworms)
• hirundinea (leaches)

Question 11

Major differences between oligochaeta and hirundnea?

Answer 11

Oligochaeta: decomposers, internal segmentation, external reproduction with equal division of reproduction

hirundinea: ectoparasites mostly, lost internal segmentation, internal fertilization