Didymops Rambur, 1842 - Cruisers
Didymops transversa (Say, 1839) - Stream Cruiser

Notes - References
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Page last updated: 16 January 2017

Notes on Didymops transversa in Michigan

Of the two species of Didymops found in North America, only D. transversa is found in Michigan and is widespread in our state (Map 1, below). (D. floridensis Davis (1921) is known only from Florida and Alabama).

Map 1: County distribution of Didymops transversa in Michigan
Click on map for a larger image

Larvae sprawl within the well-aerated sandy and muddy substrates of lakes and sometimes slow-moving areas of streams. Their habits closely parallel those of our Macromia species (Walker and Corbet (1975). Adults emerge from late-May (s.LP) through the last half of June (UP), with exuviae found some considerable distance from the water on bushes, tree trunks and buildings. At Ives Lake in northern Marquette Co, UP, emergence appears to be synchronous, with larvae crawling upon buildings vertically a distance of over 3 m (pers. obs. 1996, 1997).

Didymops transversa exuvia from Douglas Lake, Cheboygan Co., MI, 2007. Note the zebra mussels attached to the exoskeleton.



Davis, W. T.. 1921. A new dragonfly from Florida. Bulletin of the Brooklyn Entomological Society 16(5):109-111, 1 pl.

Rambur, J. P. 1842. Histoire naturelle des insectes neuroptères. Libraire Encyclopédique de Roret, Paris. 534 pp.

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

Walker, E. M. and P. S. Corbet. 1975. The Odonata of Canada and Alaska, Vol. 3. University of Toronto Press: Toronto. xvi + 308 p.

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