Chaetognathids

Question 1

what traits do Chaetognathids have?

Answer 1

• pelagic
• active predators (sit and wait)
• transparent/translucent
• 3 coelomic regions (head, trunk, tail)
• simultaneous hermaphrodites

Question 2

what function does the head serve?

Answer 2

• predation
• has 2 pharyngeal jaws (trophi) with spines for grasping (extends and retracts)
• spines impale prey and secrete toxins

Question 3

what function does the trunk serve?

Answer 3

• nervous system and digestive system
• straight digestive system
• has a second brain in trunk in addition to head
• lateral fins for propulsion

Question 4

what function does the tail serve?

Answer 4

• reproduction
• both male and female gonads
• reciprocal transfer