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The whirligig beetles are a family (Gyrinidae) of water beetles that usually swim on the surface of the water if undisturbed, though they swim underwater when threatened. They get their common name from their habit of swimming rapidly in circles when alarmed, and are also notable for their divided eyes which are believed to enable them to see both above and below water. The family includes some 700 extant species worldwide, in 15 genera, plus a few fossil species. Most species are very similar in general appearance, though they vary in size from perhaps 3 mm to 18 mm in length. They tend to be flattened and rounded in cross section, in plain view as seen from above, and in longitudinal section. In fact their shape is a good first approximation to an ellipsoid, with legs and other appendages fitting closely into a streamlined surface.
A water beetle is a generalized name for any beetle that is adapted to living in water at any point in its life cycle. Most water beetles can only live in fresh water, with a few marine species that live in the intertidal zone or littoral zone. There are approximately 2000 species of true water beetles native to lands throughout the world.
The Adephaga, with more than 40,000 recorded species in 10 families, are a suborder of highly specialized beetles and the second-largest suborder of the order Coleoptera. Members of this suborder are adephagans, a term which notably include ground beetles, tiger beetles, predacious diving beetles, and whirligig beetles. The majority of the species belongs to the family of carabids, or ground beetles (Carabidae).
Georg Hermann Alexander Ochs was a German entomologist, specialising in Coleoptera and in particular the Gyrinidae. In this group he worked on the world fauna.
Anagyrinus atavus is an extinct species of fossil beetle in the family Gyrinidae, the only species in the genus Anagyrinus.
Gyrinoides limbatus is a species of beetle in the family Gyrinidae, the only species in the genus Gyrinoides.
Gyrinopsis antiquus is an extinct species of fossil beetle in the family Gyrinidae, the only species in the genus Gyrinopsis.
Heterogyrus milloti is a species of beetle in the family Gyrinidae, the only species in the genus Heterogyrus.
Angarogyrus is an extinct genus of fossil beetles in the family Gyrinidae, containing the following species:
Avitortor primitivus is an extinct fossil species of beetle in the family Gyrinidae, the only known species in the genus Avitortor.
Baissogyrus savilovi is an extinct species of fossil beetle in the family Gyrinidae, the only species in the genus Baissogyrus.
Mesodineutes amurensis is an extinct species of fossil beetle in the family Gyrinidae, the only species in the genus Mesodineutes.
Mesogyrus is an extinct genus of fossil beetles in the family Gyrinidae, containing the following species:
Miodineutes is an extinct genus of fossil beetles in the family Gyrinidae, containing the following species:
Spanglerogyrus albiventris is a species of beetle in the family Gyrinidae, the only species in the genus Spanglerogyrus.
Copelatus restrictus is a species of diving beetle. It is part of the genus Copelatus in the subfamily Copelatinae of the family Dytiscidae. It was described by Sharp in 1882.
Dineutus loriae is a species of beetle within the family of whirligig beetles, or Gyrinidae. The species name loriae honors the Italian explorer Lamberto Loria (1855–1913). This beetle can reach a length of about 20 mm.
Gyrinus ventralis is a species of beetles from the Gyrinidae family. The scientific name of this species was first published in Kirby.
Gyrinus borealis is a species of beetle from the Gyrinidae family. The scientific name of this species was first published in 1833 by Dejean.
References
- ↑ Gyrinidae Species List at Joel Hallan's Biology Catalog. Texas A&M University. Retrieved on 9 May 2012.
- ↑ A. Handlirsch. 1906. Die Fossilen Insekten und die Phylogenie der Rezenten Formen, parts I-IV. Ein Handbuch fur Palaontologen und Zoologen 1-640
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