Gyrinus
Geoffroy, 1762
whirligig beetle
Species Guides
26- Gyrinus aeratus(Brass Whirligig Beetle)
- Gyrinus affinis(whirligig beetle)
- Gyrinus analis
- Gyrinus bifarius
- Gyrinus borealis
- Gyrinus cavatus
- Gyrinus dichrous(whirligig beetle)
- Gyrinus dubius
- Gyrinus elevatus
Gyrinus is a of small aquatic beetles in the Gyrinidae, commonly known as whirligig beetles. Members are strictly aquatic and live almost exclusively on the water surface, where they form conspicuous called rafts. They are native to multiple biogeographic regions including the Palearctic, Nearctic, North Africa, Asia, and Australia. The genus is distinguished from the larger Dineutus by its smaller size, exposed scutellum, and more pointed elytral apices.
Pronunciation
How to pronounce Gyrinus: /dʒɪˈraɪnəs/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Gyrinus are smaller than Dineutus, typically measuring less than 12 mm in length. The scutellum is exposed and visible between the elytral bases, unlike Dineutus where it is hidden. Elytral apices are more pointed rather than rounded. Species identification within the requires examination of coloration and male genitalia.
Images
Habitat
Strictly aquatic; found on the surface of calm or slow-moving freshwater bodies including rivers, streams, ponds, and lakes. Prefers sheltered pools and areas with reduced current.
Distribution
Palearctic (including Europe), Near East, Nearctic, North Africa, Asia, and Australia. GBIF records confirm presence in Colombia, Denmark, Norway, and Sweden.
Life Cycle
stages (, larva, pupa) are aquatic and typically unknown for most due to collection difficulty. Eggs possess distinctive , , and reticulation features visible under scanning electron microscopy. Larvae have specialized mouthpart structures including stipes with robust hook-like setae and hook-shaped .
Behavior
Forms on the water surface called rafts, which provide antipredator benefits through increased vigilance and detection of threats. Raft formation may also serve as aposematic signaling to fish of the noxious chemicals produced in paired pygidial glands. Movement is characteristically fast, erratic, and unpredictable, making individuals difficult to track and photograph.
Ecological Role
Surface-dwelling aquatic and scavenger. Serves as prey for fish and frogs. to including Melanosmicra sp. (Hymenoptera: Chalcididae).
Similar Taxa
Sources and further reading
- BugGuide
- Wikipedia
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- Gyrinidae | Beetles In The Bush
- June | 2010 | Beetles In The Bush | Page 2
- Ozark Trail | Beetles In The Bush
- Morphological variation in Gyrinus sericeolimbatus Rég. in New Guinea and description of a new Gyrinus species (Coleoptera: Gyrinidae)
- Description of the immature stages of the Neotropical whirligig beetle Gyrinus (Neogyrinus) rozei Ochs, 1953 (Coleoptera: Gyrinidae) and first report of the parasitoid wasp Melanosmicra sp. (Hymenoptera: Chalcididae) on a Gyrinus species
- Acrochordonichthys gyrinus, a new species of akysid catfish (Teleostei: Siluriformes) from Thailand
- Review of the whirligig beetle genus Gyrinus of Venezuela (Coleoptera: Gyrinidae)
- Figure 2: Behavioral responses of the native pond frog Pelophylax nigromaculatus and the non-native bullfrog Aquarana catesbeiana to native whirligig beetles Gyrinus japonicus and Dineutus orientalis .