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Key to Tabanidae Larvae. This key covers larvae of the 2 genera of Tabanidae that we have collected in North Dakota rivers and streams. 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.
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Genus Chrysops - The first seven abdominal segments have 3 pairs of prolegs each (two prolegs on top and bottom and one on each side). One of each pair is visible in this photo (Fig. 1). On the last segment is a respiratory siphon that is longer than its base or has a spine (Fig. 2). Overall body appears as in Figure 3.
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Genus Tabanus - The first seven abdominal segments have 4 pairs of prolegs each (one pair on each side, top, and bottom). A side pair and one top and bottom proleg are visible here (Fig. 4). The respiratory siphon on the last segment ranges from about as long as it is wide, to several times longer than it is wide (Fig. 5). Overall body appears as in Figure 6.
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