Abstract
The taxonomic position and synonymy of Hydroporus longiusculus Gemminger and Harold and H. pervicinus Fall are discussed and re-descriptions are provided. Hydroporus hirtellus LeConte syn.n., H. perplexus Sharp syn.n., and H. utahensis Gordon syn.n. are found to be junior synonyms of H. longiusculus. Hydroporus hirsutus Gordon syn.n. and H. similaris Fall syn.n. are found to be junior synonyms of H. pervicinus. Both species are the only members of the longiusculus-group. Hydroporus simplex Gordon, previously attributed to the longiusculus-group, is transferred to the nigellus-group. A lectotype is designated for H. perplexus Sharp. The location of the primary types of H. longiusculus remains unknown. Morphological variability of H. longiusculus and H. pervicinus is discussed and illustrated. Geographical distributions of these two species are mapped and some notes on their ecology are presented. Based on extreme morphological similarity to H. tenebrosus LeConte, H. subpubescens LeConte is transferred to the nigellus-group; thus, the subpubescens-group is omitted.References
Anderson, R.D. (1962) The Dytiscidae (Coleoptera) of Utah: keys, original citation, types and Utah distribution. Great Basin Naturalist, 22, 54–75.
Aubé, C. (1838) Hydrocanthares et gyriniens. In: Dejean, P.F. (Ed.), Species géneral des coléoptères de la collection de M. le Comte Dejean. Vol. 6. Méquignon Père et Fils, Paris, XVI + 804 pp.
Bameul, F. (1990) Le DMHF: un excellent milieu de montage en entomologie. L’Entomologiste, 46(5), 233–239.
Crotch, G.R. (1873) Revision of the Dytiscidae of the United States. Transactions of the American Entomological Society, 4, 383–424.
Dejean, P.F.M.A. (1833) Catalogue des coléoptères de la collection de M. le comte Dejean. Paris, 176 pp.
Fall, H.C. (1923) A revision of the North American species of Hydroporus and Agaporus. Privately printed, 129 pp.
Gemminger, M. & Harold, E.B. von (1868) Catalogus coleopterorum hucusque descriptorum synonymicus et systematicus. Tom II. E.H. Gummi, Monachii, 425–752.
Gordon, R.D. (1969) A revision of the niger-tenebrosus group of Hydroporus (Coleoptera: Dytiscidae) in North America. PhD. thesis, North Dakota State University, Fargo, 311 + 25 pp.
Gordon, R.D. (1981) New species of North American Hydroporus, niger-tenebrosus group (Coleoptera: Dytiscidae). Pan-Pacific Entomologist, 57(1), 105–123.
Gordon, R.D. & Post, R.L. (1965) North Dakota water beetles. North Dakota Insects, 5: 1–53.
Horn, G.H. (1883) Miscellaneous notes and short studies of North American Coleoptera. Transactions of the American Entomological Society, 10, 269–312.
Larson, D.J. (1975) The predaceous water beetles (Coleoptera: Dytiscidae) of Alberta: systematics, natural history and distribution. Quaestiones Entomologicae, 11, 245–498.
Larson, D.J., Alarie Y., & Roughley, R.E. (2000) Predaceous Diving Beetles (Coleoptera: Dytiscidae) of the Nearctic Region, with emphasis on the fauna of Canada and Alaska. NRC Research Press, Ottawa, Ontario, Canada, 982 pp.
LeConte, J.L. (1851–1852) Descriptions of new species of Coleoptera, from California. Annals of the Lyceum of Natural History of New York, 5, 125–216. (pp.125–184, 1851; pp.185–216, 1852).
LeConte, J.L. (1855) Analytical table of the species of Hydroporus found in the United States, with descriptions of new species. Proceedings of the Academy of Natural Sciences of Philadelphia, 7, 290–299.
Miller, K.B. & Nilsson, A.N. (2003) Homology and terminology: communicating information about rotated structures in water beetles. Latissimus, 17, 1–4.
Nilsson, A.N. (2001) Dytiscidae. World Catalogue of Insects, Vol. 3. Apollo Books, Stenstrup, 395 pp.
Nilsson, A.N. (2003) World Catalogue of Dytiscidae—corrections and additions, 1 (Coleoptera: Dytiscidae). Koleopterologische Rundschau, 73, 65–74.
Schaum, H. (1847) Hydroporus perplexus. In: White, A. (Ed.), Nomenclature of coleopterous insects in the collection of the British Museum. Part II. Hydrocanthari. Edward Newman, London, p. 39.
Sharp, D. (1882) On aquatic carnivorous Coleoptera or Dytiscidae. Scientific Transactions of the Royal Dublin Society, 2(2), 179–1003.
Stephens, J.F. (1835) Illustrations of British entomology. Mandibulata. Vol. V. London, pp. 366–440.
Wallis, J.B. (1973) An annotated list of the Hydroadephaga (Coleoptera: Insecta) of Manitoba and Minnesota. Quaestiones Entomologicae, 9, 99–114.