Basiaeschna Selys,1883
Say, 1839 - SpringtimeDarner

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Page last updated: 30July 1998 (EB)

Notes on larvalBasiaeschna janata in Michigan

A montypic genus, Basiaeschna janata rangesover a wide range in North America and is encountered throughoutMichigan.

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Larvae of Basiaeschna are similar inappearance and habits to Boyeria but aredifferentiated by longer paraprocts, pointed palpal lobes, andearlier adult emergence. Walker's(1958) description of this species'habitat preferences appears well-supported by larval collection inMichigan. They are frequently collected on the undersides of stonesand water-logged woody material in slower-moving parts of foreststream riffles, but are more frequently collected in sheltered partsof well-oxygenated lakes. For emergence (mid-May through mid-June),larvae can climb on vegetation, stumps and man-made objects almost 2m in height in order to emerge. Larval collection in Marquette Co.appear to indicate two size classes, indicating a two-yeardevelopmental period before adult emergence (EB, pers. obs.).


Say, T. 1839.Descriptions of new North American neuropterous insects andobservations on some already described by (the late) Th. Say.Journal of the Academy of NaturalScience of Philadelphia 8:9-46.

Selys-Longchamps, M.E. de. 1883. Synopsis des Aeschnines. Première partie:Classification. Bulletin del'Académie royale des Sciences de Belgique 3(5):712-748.

Walker, E. M. 1958.The Odonata of Canada and Alaska, Vol. 2. University of TorontoPress: Toronto. xii + 318.