Acanthallagma Williamson & Williamson, 1924

The small damselflies in this genus are rarely seen. Adults have the basal half of the wings dark (Fig. 13). See Williamson & Williamson (1924) for identification. Habitat is small streams in Amazonian forest.

Acanthallagma caeruleum Williamson & Williamson, 1924 . Publ. Recs. ECU: (L06), (H08), (P11), (H14); NA: * Tennessen (1996b). Also BRA: (L06), (H08), (P11); plus PER: (P16).

Addl. Data. OR, Francisco de Orellana: 1 ♀, Puerto Francisco de Orellana, 1.7 km W on Loreto Road from Coca-Sachas Road, stream, pools & flowing shallow marsh (-0.4367, 77.0017, 258m), 13 vi 1995, leg. & det. WFM [FSCA]; 1 ♂, same data but leg. & det. KJT [KJT]; 1 ♀, La Nueva Esperanza, across Río Napo from near Primavera “Limoncocha”, Río Napo & Lake Taracoa (-0.45, -76.77, 300m), 4 xi 1980, leg. & det. MJW [FSCA]; 1 ♂, 2 ♀♀, Primavera, Laguna Taracoa, 27 vii 1977, leg. & det. DRP [DRP]; SU, Lago Agrio: 2 ♂♂, 3 ♀♀, stream 24 km W of Lago Agrio, brushy ponds on stream (-0.12, -77.071, 335m), 20 viii 1980, leg. & det. SWD [RWG]; Shushufindi: 1 ♂, Shushufindi, 2 km S of Yamaramsuku School on road to Limoncocha, stream & marsh (-0.2147, -76.6494, 255m), 19 vii 1996, leg. & det. WFM [QZAC]; 1 ♂, same data but leg. & det. KJT [KJT]; Río Sin Nombre, 5 km SE of Shushufindi on road to Limoncocha (-0.23, -76.65, 265m), 18 i 2011, leg. DLW, det. WAH (WAH).