Insect Key Part 5

David A Kendall BSc PhD
Consulting Entomologist

2 Birchdene Nailsea Bristol BS48 1QD UK
Tel/Fax: 01275 854224
E-Mail: [email protected]

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Insect Identification

Key to the main Orders of Insects - Part 5

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(insect without wings - aquatic)
70a.	Mouth-parts with a tube-like 'beak' or with long stylets for piercing and sucking	71
70b.	Mouth-parts with jaws (mandibles) for biting and/or chewing	72

71a.	Mouth-parts forming a robust tube-like 'beak' (rostrum) folded backwards under the body when not in use	Hemiptera
71b.	Mouth-parts forming a pair of long and slender stylets extending more or less straight forward in front of the head between the antennae and about as long or longer than the latter	Larvae of Neuroptera

72a.	Head with a hinged protrusible grasping organ (or 'mask') bearing large terminal claws (normally folded beneath the head when not in use)	Nymphs of Odonata
72b.	No hinged protrusible 'mask' beneath the head	74

73a.	Abdomen with pairs of feather-like or flat plate-like lateral appendages on some segments (gill filaments) and 3 long terminal appendages (paired cerci and a median filament)	Nymphs of Ephemeroptera
73b.	Without these features combined	74

74a.	Abdomen without lateral appendages but with 2 long terminal appendages (cerci); antennae long and slender (much longer than the head)	Nymphs of Plecoptera
74b.	Without these features combined	75

75a.	Abdomen with pairs of multi-jointed feather-like lateral appendages on some segments (gill filaments) and sometimes a single terminal appendage	Larvae of Neuroptera
75b.	Abdomen without lateral appendages (gill filaments) or if such appendages present then always unjointed	76

76a.	Last abdominal segment with a pair of fleshy appendages each bearing a strong claw; middle- and hind-legs longer than the width of the thorax; body often enclosed in a tubular case made from small pebbles or other debris	Larvae of Trichoptera
76b.	Without these features combined	Larvae of Coleoptera

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Last revised January 2009