Features for Odonata

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Figure 6. Abdominal segments numbered.

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Figure 7. Pterostigma - a pigmented cell on the costal margin. Present in both wings of Odonata and on the forewing of Hymenoptera, Pscoptera, Megaloptera and Mecoptera.

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Figure 5. Forewing triangle (Anisoptera) - triangle of forewing elongate across wing axis.

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Figure 4. Anal vein (Zygoptera) present.

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Figure 2. Discoidal cell of Anisoptera divided into a hypertriangle and a triangle. Forewing triangle elongate along wing axis.

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Figure 3. Two antenodal crossveins (Zygoptera) extending across the costal and subcostal spaces.

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Figure 1. Discoidal cell of Zygoptera a simple quadrilateral, closed at its base.