Odonata - Page I14

	A CPIE Notebook Project – Keys to Aquatic Biota of Hawai‘i		Page I14

	Key to Hawaiian Dragonflies and Damselflies (Odonata)¹
	CPIE Aquatic Environments Near Links: [ALGAE] \| [HIGHER PLANTS] \| [OTHER INVERTEBRATES] \| [INSECTS] \| [VERTEBRATES]
	Phylum ARTHROPODA, Class INSECTA The dragonflies (Anisoptera) and damselflies (Zygoptera) are represented in Hawai‘i by three families, 9 genera, and about 34 species (Nishida, 1992). The largest genus is Megalagrion with 23 species and 5 subspecies, all endemic to the Hawaiian Islands (Polhemus, 1995). Many of these are threatened with extinction and members of the genus are only rarely seen on O‘ahu in lowland areas.
	Selected odonate links: O.I.N - Odonata Information Network Digital Dragonflies -- Texas CPIE species list - list of Hawaiian Odonata

[DRAGONFLIES & DAMSELFLIES]
124a		Elongated insects with four wings, frequently observed near bodies of water. Adult damselflies and dragonflies	[125]
124b		Aquatic insect nymphs: larval forms living in aquatic environments or in water within vegetation. Having compound eyes and jointed legs, but without wings (wing pads may be present)	[126]
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	[TERRESTRIAL ADULTS]
125a	(103) & (124)	Front and hind wings similar in shape and size, with a narrow section at base (see Fig. 1); wings held, at rest, together over body (see Fig. 3). { Body slender. Head broad, rectangular. Damselflies ~ Suborder ZYGOPTERA	[127]
125b		Hind wings broader than front wings and held out horizontally (or somewhat up or down) at rest. { Body elongate, but stout. Head round. Dragonflies ~ Suborder ANISOPTERA	[135]
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	[AQUATIC NYMPHS]
126a	(111) & (124)	Tip of abdomen with three gills, which may be leaf-like (foliate) or dagger-like (lanceolate). Movement by wriggling and sculling with gills. Damselfly naiad ~ Suborder Zygoptera	[130]
126b		Tip of abdomen with short spines or none, but lacking gills. Rapid movement by squirting water from anus ("jet propulsion"). Dragonfly naiad ~ Suborder ANISOPTERA	[136]
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