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| NAS - Nonindigenous Aquatic Species |
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Common Name: monogenetic fluke
Taxonomy: available through 
Identification: This fish fluke possesses special adhesive sacs in the anterior attachment region. There are generally 7 pairs of hooks and 2–4 eyespots in this area in dactylogyrids. Unlike the closely related D. amphibothrium, there are no tegumental sacs, spikes, or pads specialized to contain glands in D. hemiamphibothrium (El-Naggar and Kearn 1983; Post 1983).
Size: Can grow to 1.4 mm in length and 0.18 mm in width (Gussev 1985).
Native Range: D. hemiamphibothrium is native to Eurasia (U. S. Department of the Interior 1993).
Nonindigenous Occurrences: D. hemiamphibothrium was recorded for the first time in 1992 in the St. Louis River, a tributary of Lake Superior; it probably first arrived in the early 1980s with introduced Eurasian ruffe (Gymnocephalus cernuus) (U. S. Department of the Interior 1993).
Ecology: Dactylogyrids in general are oviparous, have no uterus, and only contain one egg at a time in an ootype structure (Post 1983). There is no free-swimming larval stage; young grow to nearly adult size inside the parent (El-Naggar and Kearn 1983). This species is considered to be specific to ruffe in its native range (U. S. Department of the Interior 1993), although it is listed as a parasite of the genera Gymnocephalus and Perca by Gibson et al. (1996). It occurred on the gill filaments of Eurasian ruffe in the St. Louis River (U. S. Department of the Interior 1993).
Means of Introduction: D. hemiamphibothrium was very likely introduced with its host, Eurasian ruffe, in ballast water (U. S. Department of the Interior 1993).
Status: Established
Impact of Introduction:
A) Realized: None known.
B) Potential: Given that D. hemiamphibothrium may be specific to ruffe in its native range, it is unlikely that it will exert negative impacts on native fish species in the Great Lakes (U. S. Department of the Interior 1993).
Remarks:
References
El-Naggar, M. M. and G. C. Kearn. 1980. Ultrastructural observations on the anterior apparatus in the monogeneans Dactylogyrus amphibothrium and Dactylogyrus hemiamphibothrium. Zeitschrift fuer Parasitenkunde 61(3):223-242.
El-Naggar, M. M. and G. C. Kearn. 1983. The tegument of the monogenean gill parasites Dactylogyrus amphibothrium and D. hemiamphibothrium. International Journal of Parasitology 13(6):579-592.
Gibson, D. I., T. A. Timofeeva, and P. I Gerasev. 1996. A catalogue of the nominal species of the monogenean genus Dactylogyrus Diesing, 1850 and their host genera. Systematic Parasitology 35:3-48.
Gussev, A. V. 1985. Handbook for Identifying Parasites of Fish of the Fauna of the USSR. Publishing House “Hayka”, Leningrad, USSR. Vol. II. 424 pp. (in Russian)
Post, G. 1983. Textbook of Fish Health. T. F. H. Publications, Inc. Ltd., The British Crown Company of Hong Kong. 256 pp.
U. S. Department of the Interior. 1993. Research Information Bulletin, U. S. Department of the Interior, National Biological Survey No. 97. 2 pp.
Author: Rebekah M. Kipp
Contributing Agencies: 
NOAA - GLERL
Revision Date: 6/13/2007 Citation for this information:
Rebekah M. Kipp. 2009. Dactylogyrus hemiamphibothrium. USGS Nonindigenous Aquatic Species Database, Gainesville, FL.
<http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=2731> Revision Date: 6/13/2007
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