VCSU Macro-Invertabrate Lab
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Main Key

Order key (cont.)

Nonwinged aquatic insects

 
Group 1 - Six legs (Fig. 1), 2 to 3 prominent caudal filaments (Fig 2) or end of abdomen having several sharp points (Fig. 3), usually with wing pads (Fig. 4) (Includes Orders Ephemeroptera, Plecoptera, and Odonata)

Heptageniidae body Caenidae tail Libellulidae posterior

Polymitarcyidae wing
 
Group 2 - Six legs (Fig. 5-7), no wing pads (Fig 5), (Includes Orders Trichoptera, Lepidoptera, Megaloptera, Neuroptera, and larval Coleoptera)

Hydropsychidae pronotum Sialidae body Elmidae body
 
Order Hemiptera - Six legs (Fig 8), beaklike mouthparts for piercing sucking (Fig. 9).

Notonectidae body Nepidae head
 
Order Collembola - Six legs, small in size, abdomen with six or fewer segments (Fig. 10).

Sminthuridae body
 
Order Diptera - No true legs present on thorax (Fig. 11) - may have fleshy protuberances on thorax but they are not jointed (Fig. 12 & 13).

Ceratopogonidae body Simulidae proleg Empididae body
 

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