Aquatic Micro-invertibrates

Question 1

Features of Alderfly nymphs (Order Megaloptera)?

Answer 1

Abdomen ends with a tail

Side of abdomen gilled with fine hairs

Large jaws

Question 2

Features of Stonefly nymphs (Order: Plecoptera)?

Answer 2

Two long cerci

Bottom crawlers

Swim by wriggling side to side

Question 3

Features of mayfly nymphs (Order: Ephemeroptera)?

Answer 3

Usually three tails but can have two

Swim with Dorso-ventral movement.

Question 4

Features of caddis fly larvae (Order: Trichoptera)?

Answer 4

Hooked appendage at end of abdomen in free living caddis.

Cased-caddis are distinguished by the differing constructions of their cases.

Question 5

Features of Damselfly abs Dragonfly nymphs (Order: Odonata)?

Answer 5

Damselflies - Three plates at end of abdomen

Dragonflies - Three triangular points at end of abdomen.

Extendable labium with biting mouthparts

Question 6

Features of beetle larvae ( Order: Cleoptera)?

Answer 6

Typical Cleoptera features but vary in size.

Usually well defined heads but can be grub-like.

Rarely have legs on the abdomen

Question 7

Features of true fly larvae (Order: diptera).

Answer 7

Range widely in size and colour

Cranefly larvae - tipulids

Blackfly larvae - simulids

Midge larvae - chironomids

Question 8

Features of leeches (Subclass: Hirudinea)?

Answer 8

Segmented

Usually Dorso-ventrally flattened

Suckers on both ends

Fish leeches - are cylindrical, long and thin and have around 15 pale bars.

Question 9

Features of crustaceans?

Answer 9

Laterally flattened.

Freshwater hoglouse - is Dorso-ventrally flattened

Question 10

Features of tubifex worm (Subclass: Oligochaeta)?

Answer 10

Long

Question 11

Features of flatworms (Class: Turbellaria)?

Answer 11

Flattened