VCSU Macro-Invertabrate Lab
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Order Diptera

Group 4

 
Family Syrphidae - Posterior spiracle plates are fused or close together, those we have found in North Dakota have the very long spiracular tube on the end of the abdomen (Fig. 1).

Syrphidae body
 
Family Sciomyzidae - Posterior spiracle plates always separated and skeleton with a ventral arch below base of mouth hooks (Fig. 2).

Sciomyzidae body
 
Family Ephydridae - Posterior spiracle plates always separated (Fig. 3), skeleton with a ventral arch below base of mouth hooks and posterior abdominal segment somewhat tapered (Fig. 4).

Ephydridae posterior Ephydridae body
 
Family Muscidae - Posterior spiracle plates always separated (Fig. 5), skeleton with a ventral arch below base of mouth hooks and posterior abdominal segment cut off squarely. Appearance as in Figure 6.

Muscidae posterior Muscidae body
 

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