Enallagma basidens Calvert, a small bluet damselfly, has been expanding its range across North America since the early part of this century. It is now recorded from two widely-separated localities in the lower peninsula of Michigan

O\u27Brien, Mark F

English

Valparaiso University

The Great Lakes Entomologist Volume 30 Number 4 - Winter 1997 Number 4 - Winter 1997 Article 6 December 1997 Enallagma Basidens (Odonata: Coenagrionidae) Expands Its Range Into Michigan Mark F. O'Brien University of Michigan Follow this and additional works at: https://scholar.valpo.edu/tgle  Part of the Entomology Commons Recommended Citation O'Brien, Mark F. 1997. "Enallagma Basidens (Odonata: Coenagrionidae) Expands Its Range Into Michigan," The Great Lakes Entomologist, vol 30 (3) Available at: https://scholar.valpo.edu/tgle/vol30/iss3/6 This Peer-Review Article is brought to you for free and open access by the Department of Biology at ValpoScholar. It has been accepted for inclusion in The Great Lakes Entomologist by an authorized administrator of ValpoScholar. For more information, please contact a ValpoScholar staff member at scholar@valpo.edu. ,-­1997 THE GREAT LAKES ENTOMOLOGIST 181 ENALLAGMA BAS/DENS (ODONATA: COENAGRIONIDAE) EXPANDS ITS RANGE INTO MICHIGAN Mark F. O'Brien 1 ABSTRACT Enallagma basidens Calvert, a small bluet damselfly, has been expand­ing its range across North America since the early p t of this century. It is now recorded from two widely-separated localities in the lower peninsula of Michigan. Enallagma basidens Calvert is a small bluet damselfly which has been documented as expanding its range into the Great Lakes region and into northeastern North America (Cannings 1989, Westfall and May 1996). It was not previously listed from Michigan, (Kormondy 1958, 1962; Montgomery 1967), and the following records represent the first known localities for this species in Michigan. All specimens listed below are deposited in the Univ. of Michigan Museum of Zoology. LENAWEE CO.: [near Tecumseh, "Ives Road Fen"] Twp. 6S, Rge. 4E, Sec. 3, 10 & 15., 1 July 1993 (20, 1 <?), [coIL by MI-TNC] (specimens bear the fol­lowing Michigan Odonata Survey Catalog numbers:MOS#0006006, #0006187, #0006530); 9 Aug. 1993, 1<? [MI-TNC] (MOS#0006944); 1 July 1997, 1:3, (MOS#0010953), 1 <? (MOS#0010755) (in tandem) Field no. MIF0970701-1, 2, Keith Summerville, colI. TUSCOLA CO.: Caro, River Park, near small pond, Twp.12N, Rge. 9E, Sec. 10.25 Aug. 1997, M. F. O'Brien coIl., 1 (MOS#0025290). This small (21-28 mm) Enallagma is quite distinctive, as the black humeral stripe on the thorax is divided for nearly the entire length, and this feature can be easily seen with a ha d lens (Figure 1). Although is species is reputed to be a weak flier (Westfall and May 1996), it is apparently ex­tending its range fairly rapidly (Cannings 1989). Enallagma basidens was recorded from southwestern Ohio as early as 1937, and has since spread throughout that state and is quite common (Glotzhober 1995). Its spread through Indiana since 1929 (Montgomery 1932) has been documented by heefforts of B.B. Montgomery (1932, 1934, 1935, 1937, 194 , 1950, 1953, 1955, 1966). Cannings (1989) provides a summary of the spread of E. basidens across North America. Its presence in Michigan may have gone undetected for several years, as the species was reported from southwestern Ontario (Pelee Is. and near Windsor) as early as 1985 (Cannings 1989). Populations could have spr ad into Michigan from the south-bordering states, as E. basi­dens was present in Lucas Co., OH since at least 1973 (Glotzhober 1995). It lInsect Division, Museum of Zoology, The University of Michigan, Ann Arbor, MI 48109·1079. 1O'Brien: <i>Enallagma Basidens</i> (Odonata: Coenagrionidae) Expands Its RPublished by ValpoScholar, 1997182 THE GREAT LAKES ENTOMOLOGIST Vol. 30, No.4 4mm Fig. 1. Lateral view of a male Enall gma basidens thorax, showing the di­vided humeral stripe (anterior end is to the left). reached New York as early as 1989 (Donnelly 1992) and is also now found in Connecticut (T. W. Donnelly, pers comm.). Enallagma basidens is found around ponds (permanent and semi-perma­nent), sheltered backwaters, artificial impoundments and slow stretches of streams (Cannings 1989, Westfall and May 1996). Although disturbed aquatic habitats seem to be favored, the initial New York locality was a rather pristine pond in a terminal moraine in central New York (Donnelly, pers. comm.). Fens and seeps ar  not listed as its h bitat. Perhaps this versa­tility has enhanced its spread, since anthropogenic disturbances often result in small ponds and temporary pools. The pond at River Park in Caro, MI was a relatively shallow pond that was fed from a small drainage area which then drained into the Cass River. Associated Zygoptera were Enallagma civile (Hagen), E. exsulans (Hagen) (in the nearby Cass R.), I chnura verti­calis (Say), Argia fumipennis violacea (Hagen), Argia apicalis (Say) (also Cass R.) and Calopteryx maculata (Beauv.). Further collecting efforts in disturbed areas such as quarry ponds, reser­voirs, drainage ditches, and other artificial impoundments should tur  up more records of E. basidens in the southern Lower Peninsula of Michigan. ACKNOWLEDGMENTS I thank Keith Summerville and Chris Clampitt, of the Michigan Chapter of the Nature Conservancy for the Lenawee Co. specimens collected in 1993 2The Great Lakes Entomologist, Vol. 30, No. 3 [1997], Art. 6https://scholar.valpo.edu/tgle/vol30/iss3/6--------=~~===~====~~~-------THE GREAT LAKES ENTOMOLOGIST1997 183 and 1997. Bill Westrate originally identified the 1993 specimens for the TNC collections. Nick Donnelly and Bob Glotzhober provided helpful comments on the manuscript. I also thank Mike Kielb and Tom Heatley for their cama­raderie on the collecting rip to the thumb area of Michigan. This paper is a result of the Michigan Odonata Survey. LITERATURE CITED Cannings, R. A. 1989. Enallagma basidens Calvert, a dragonfly new to Canada, with notes on th  expansion of its range in North America (Zygoptera: Coenagrionidae). Notulae Odonatologicae 3(4):53-55. Donnelly, T. W. 1992. The Odonata of New York. Bull. of Amer. Odonatology. 1(1): 1-27. Glotzhober, R. C. 1995. The Odonata of Ohio-A preliminary report. Bull. of Amer. Odonatology.3(1):1-30. Kormondy, E. J. 1958. A catalogue of the Odonata of Michigan. Misc. Pub!. Museum of Zoology, Dniv. of Michigan. 104:1-43. Kormondy, E. J. 1962. New records of Michigan Odonata. Entomo!. News 73:191-194. Montgomery, B.E. 1932. Records of Indiana Dragonflies, VI, 1931. Proc. Ind. Acad. Sci. 41: 449-454. 1934. Records of Indiana dragonflies-VII. 1932-1933. Proc. Ind. Acad. Sci. 43:211-217. --. 1935. Records of Indiana dragonflies, VIII, 1934. Proc. Ind. Acad. Sci. 44:231-235. --. 1937. Records of Indiana dragonflies, IX, 1935-1936. Proc. Ind. Acad. Sci. 46:203-210. --. 1941. Records of Indiana dragonflies, X, 1937-1940. Proc. Ind. Acad. Sci. 50:231-235. --. 1950. Notes and records of Indiana Odonata-1941-1950. Proc. Ind. Acad. Sci. 60:205-210. --. 1953. Notes and records of Indiana Odonata-1951-1952. Proc. Ind. Acad. Sci. 62:200-202. --. 1955. Notes and records of Indiana Odonata-1953-54. Proc. Ind. Acad. Sci. 64:131-135. --. 1966. Distribution of Odonata. pp. 348-350. In: Chandler, L. The origin and composition of the insect fauna. Chapt. 20., Natural features of Indiana.  Acad. Sci. Indianapolis. --. 1967. The distribution of Odonata in the North Central States. Proc. North Central Br. Entomo!. Soc. America. 22:121-129. Westfall, M. J., Jr. and M. L. May. 1996. Damselflies of North Am rica. Scientific Pub­lishers, Gainesville, FL, 650 pp. 3O'Brien: <i>Enallagma Basidens</i> (Odonata: Coenagrionidae) Expands Its RPublished by ValpoScholar, 1997

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\u3ci\u3eEnallagma Basidens\u3c/i\u3e (Odonata: Coenagrionidae) Expands Its Range Into Michigan

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