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Family Sciomyzidae

Key to Sciomyzidae Larvae. This key covers larvae of the 2 genera of Sciomyzidae that we have collected in North Dakota rivers and streams. They are quite rare in our collection because we generally do not collect from the still water environments they prefer. This key aids by providing simple features you can look for to identify your specimen. After using the key, confirm the identity of your specimen by reading the genus page.

 
Genus Sepedon - The last segment has a total of ten spiracular lobes. Four lobes are best seen from a ventral perspective (Fig. 1). The other six lobes can be seen from the dorsal side (Fig. 2). The overall body appears as in Figure 3.

Ventral view of Sepedon lobes Dorsal view of Sepedon lobes Sepedon larvae
 
Genus Elgiva - On the final body segment, eight spiracular lobes are present (Fig. 4). The lobes are situated at the tip of an extension that is noticeably longer than it is wide (Fig. 5). The overall body appears as in Figure 6.

Elgiva spiracular lobes Elgiva abdominal segment Elgiva body
 
Genus Tetanocera - On the final body segment, eight spiracular lobes are present (Fig. 7). The lobes are situated on the tip of an extension that is about as long as it is wide (Fig. 8). The overall body appears as in Figure 9.

Tetanocera spiracular lobes Tetanocera abdominal segment Tetanocera larvae
 

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