StylogomphusFraser, 1922 - Least clubtail
Stylogomphus albistylus(Hagen in Selys,1878) - Least Clubtail
Fig. 1:S.albistyluslarva collected from Mountain Stream,
Marquette Co., Michigan, USA, on 30 June 1996 by Bright, O'Brien andKielb
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Page last updated: 14 July1998 (EB)
Notes on Stylogomphusalbistylus in Michigan
Until recently, Stylogomphus albistylushas been known from only one locality in the northern part of theLower Peninsula (Leonard 1940). Recently, several large populations of both adultsand larvae have been found in the Upper Peninsula (Yanoviak 1993, Kielb et al.1996, Bright 1997), and S.albistylus undoubtedly is morewidespread there based on its frequency in northern Wisconsin(Hilsenhoff1995) (see Map 1). Several adult andlarval specimens have come from streams in the northern LowerPeninsula, and there is also one unverified larval record fromOakland County (Bidlack, pers. comm.).
Map 1: County distribution ofStylogomphus albistylus
Click on map for a full-sizedimage
Stylogomphus larvae (Fig. 1, above) are distinctive from our othergomphids by its small size and spatulate-shaped third antennalsegment with the inner margin straight (Hagenius larvae areconsiderably larger, with very flat abdomens and large tubercles onthe head; Lanthus is not found in Michigan). Larvae apparently preferrocky, clean streams with considerable gradient. Based on the rangeof larval sizes from samples collected from Marquette Co. in 1996(< 3 mm to 19.3 mm), this species appears to require more than oneyear to complete its larval stage in this part of its range.Emergence in this part of its range occurs in late June during latemorning and early afternoon, with larvae crawling from a well-shadedstream upon rocks and stream-side plants, with adults soon (within 15minutes) thereafter emerging (Kielb et al.1996, Bright 1997).
Other links with information on the biology orecology of larval Stylogomphus:
none found so far (10 January 1998)
Bright, E. 1997. Newregional records for Michigan. Williamsonia 1(4):3
Fraser, F. C. 1922.New and rare Indian Odonata in the Pusa Collection. Memoirs of the Department of Agriculture in India,Entomological Series 7(7):39-77.
Hilsenhoff, W. L.1995. Aquatic insects of Wisconsin. Keys to Wisconsin genera andnotes on biology, distribution and species. (3rd Ed.). PublicationNumber 3 of the Natural History Museums Council, University ofWisconsin-Madison (1995).
Kielb, M. A., E.Bright, and M. F. O'Brien. 1996. Range extension of Stylogomphusalbistylus(Odonata: Gomphidae) for the Upper Peninsula of Michigan.The Great LakesEntomologist 29(2):87-88.
Leonard, J. W. 1940.Lanthus albistylus (Hagen), a new record for Michigan, with ecologicalnotes on the species (Odonata: Gomphinae). Occasional Papers of theMuseum of Zoology, University of Michigan, No. 414. 6 pp, 1plt.
Selys-Longchamps, E.de. 1878. Quatriemes Additions au synopsis des Gomphines.Bulletin de l'Académie royale desSciences de Belgique (2)46:408-471,658-698.
Yanoviak, S. P.1993. A comparison of benthic macroinvertebrate assemblages inlake-outlet and dendritic streams of the Huron Mountain Region ofMichigan. Unpublished MS Thesis, Purdue University.