Head and Mouthparts

Question 1

Sclerites

Answer 1

Plates of chemically hardened integument (Natural covering)

Question 2

Suture

Answer 2

Line or groove marking the union of two sclerites, or a line of weakness across a sclerite

Question 3

Sulcus

Answer 3

Line marking an internal ridge or cuticle arising from an invagination or infolding

Question 4

Apodeme

Answer 4

An internal ridge of cuticle

Question 5

Where is segmentation readily apparent?

Answer 5

Everywhere on the body except on the head

Question 6

Why is segmentation not readily apparent on the head?

Answer 6

The segments have become fused to form a continuous head capsule (more or less)

Question 7

What are the 6 segments of the head?

Answer 7

1. Labral
2. Antennal
3. Postantennal (or Intercalary)
4. Mandibular
5. Maxillary
6. Labial

Question 8

What is the Labrum?

Answer 8

Functions like an upper lip

Question 9

What are the Mandibles?

Answer 9

Teeth for chewing food

Question 10

What is the Hypopharynx?

Answer 10

Functions like a tongue

Question 11

What are the Maxillae?

Answer 11

Appendages that hold and guide food for the mandibles. Also possess sensory palps.

Question 12

What is the Labium?

Answer 12

Functions like a lower lip. Also possesses a pair of sensory palps

Question 13

What are some functions of the mouthparts? (different kinds of mouthparts) (6)

Answer 13

1. Chewing
2. Piercing and Sucking
3. Sponging
4. Rasping and Sucking
5. Siphoning
6. Chewing and lapping

Question 14

What are the three orientations of insect mouthparts? (Names) What are their orientations?

Answer 14

1. Hypognathous - projecting downwards
2. Prognathous - Projecting forwards
3. Opisthognathous - Projecting rearwards

Question 15

What are some sensory structures on the head? What are they used for? (4)

Answer 15

1. Compound eyes - vision/image formation
2. Ocelli - Light perception
3. Antennae - Olfacation (smell)
4. Maxillary and Labial palps - Gustation (Eating)