Helophorus

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Helophorus
Helophorus aquaticus01.jpg
Helophorus aquaticus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Superfamily: Hydrophiloidea
Family: Helophoridae
Leach, 1815
Genus: Helophorus
Fabricius, 1775
Helophorus grandis

Helophorus ís the only genus in the beetle family Helophoridae (traditionally included within Hydrophilidae as the subfamily Helophorinae). They are small insects, found mainly in the Holarctic region (150 occur in Palearctic and 41 species in North America), but two or three species also live in the Afrotropical region, Central America and one in the Indomalayan region (northern India).[1][2]

Characteristics[edit]

Length about 2–9 mm. Body elongate with outline more or less interrupted between pronotum and elytra. On pronotum they have granulate sculpture and unique pattern of 7 longitudinal grooves. Ventral surface is with fine microsculpture, pubescent. Larvae are with long 3 segmented urogomphi and simple (non lobate) 8th tergum. They have four-segmented legs and a 10 segmented abdomen (with the 10-th segment being a bit reduced).[3] Helophorus larvae may damage wheat, turnips, rutabagas, and rapeseed.

Systematics and evolution[edit]

Helophoridae belong to the superfamily Hydrophiloidea, and may be the sister taxon of Hydrochidae,[4] or a clade comprising Hydrochidae, Hydrophilidae and Spercheidae or Georissidae and Epimetopidae.[5] Earlier systems included all of these families in the family Hydrophilidae. There are about 180 living species, including:

The genus is divided into many subgenera (Atracthelophorus, Cyphelophorus,Empleurus, Eutrichelophorus, Gephelophorus, Helophorus, Orphelophorus, Rhopalohelophorus and Transithelophorus).

References[edit]

  1. ^ Angus R.B., 1992. Insecta: Coleoptera: Hydrophilidae: Helophorinae, pp. XI + 144. In: Schwoerbel J. & Zwick P. (eds.), Süsswasserfauna von Mitteleuropa, Band 20/10-2. Spektrum Akademischer Verlag, Heidelberg, Berlin
  2. ^ Mart, A, Erman, O., A Study on Helophorus Fabricius, 1775 (Coleoptera, Hydrophilidae) Species. Turk. J. Zool. 25 (2001) 35-40
  3. ^ M.Hansen. Phylogeny and classification of the staphyliniform beetle families (Coleoptera). Biologiske Skrifter 48, Copenhagen, 1997
  4. ^ E.Anton, R.G.Beutel, On the Head Morphology and Systematic Position of Helophorus (Coleoptera: Hydrophiloidea: Helophoridae.)Zoologischer Anzeiger - A Journal of Comparative Zoology, Vol.242, 4, 2004
  5. ^ M.S.Caterino et al. On the constitution and phylogeny of Staphyliniformia (Insecta: Coleoptera), Molecular Phylogenetics and Evolution, Vol.34 - 3, 2005