Whirligig-beetle
Guides
Dineutus
whirligig beetles
Dineutus is a genus of whirligig beetles (family Gyrinidae) characterized by relatively large body size compared to other whirligig beetles. Adults are 9–15 mm long with smooth, shallowly lined, or grooved elytra. The genus occurs across North America and other regions, with species inhabiting the surface waters of streams and rivers. Members are distinguished from the smaller genus Gyrinus by their larger size and hidden scutellum.
Dineutus assimilis
Dineutus assimilis is a species of whirligig beetle in the family Gyrinidae, native to North America. Like other members of the genus Dineutus, it inhabits the surface of freshwater bodies where it exhibits characteristic rapid, erratic swimming behavior. The species is distinguished from congeners primarily by ventral coloration and leg pigmentation. It is part of a diverse genus of surface-dwelling aquatic beetles known for their gregarious "rafting" behavior and chemical defenses.
Dineutus carolinus
whirligig beetle
Dineutus carolinus is a species of whirligig beetle in the family Gyrinidae. It is found across the Caribbean Sea, Central America, and North America. Whirligig beetles in this genus are among the largest members of the family and are characterized by their distinctive surface-dwelling aquatic lifestyle. The species was described by LeConte in 1868.
Dineutus discolor
large whirligig beetle
Dineutus discolor is a species of whirligig beetle in the family Gyrinidae, commonly known as the large whirligig beetle. Adults are active on the water surface, where they form conspicuous aggregations called 'rafts.' These social groups provide antipredator benefits through cooperative vigilance and collective detection of threats. The species is among the larger members of its genus, reaching approximately 12 mm in length.
Dineutus hornii
whirligig beetle
Dineutus hornii is a species of whirligig beetle in the family Gyrinidae, distributed across North America including Canada (Manitoba, New Brunswick, Nova Scotia) and presumably the United States. Whirligig beetles in the genus Dineutus are among the largest members of the family, characterized by their distinctive surface-dwelling behavior and aggregations on calm water. Like other gyrinids, they possess divided compound eyes adapted for simultaneous vision above and below the water surface, and pygidial glands that produce defensive secretions.
Dineutus nigrior
whirligig beetle
A species of whirligig beetle in the family Gyrinidae, found across North America. Adults are surface-dwelling aquatic beetles known for their distinctive circular swimming patterns and social aggregations on water. Males possess enlarged protarsal pads used during mating attempts, and accessory glands that show positive allometry associated with increased mating success. The species serves as host to water mites, with parasitism levels linked to host body condition and sex.
Dineutus productus
whirligig beetle
Dineutus productus is a species of whirligig beetle in the family Gyrinidae. First described in 1895, it was historically known from Oklahoma and Texas, with a 2014 discovery marking the first record for Kansas. Unlike most Dineutus species that inhabit flowing water, this species has been found in small, shallow, stagnant pools with muddy bottoms and abundant emergent vegetation. It belongs to a genus characterized by large size (~10–12 mm), rounded elytral apices, and a hidden scutellum.
Dineutus serrulatus
whirligig beetle
Dineutus serrulatus is a species of whirligig beetle in the family Gyrinidae, first described by LeConte in 1868. The species occurs in the Appalachian Mountains of the southeastern United States, with records from northeastern Georgia and the southwestern Carolinas. A subspecies, D. s. analis, has been recorded from Kansas and the southeastern United States.
Dineutus shorti
whirligig beetle
Dineutus shorti is a species of whirligig beetle (family Gyrinidae) described in 2015 from the southeastern coastal plain of the United States. It represents the first unequivocally new species of whirligig beetle described from the U.S. since 1991. The species has an extremely restricted range, known only from a narrow section of the coastal plain in the Blackwater and Pensacola river watersheds of Santa Rosa and Okaloosa counties, Florida and Covington County, Alabama. It was named in honor of aquatic coleopterist Andrew E. Z. Short.
Dineutus sublineatus
whirligig beetle
Dineutus sublineatus is a species of whirligig beetle in the family Gyrinidae, found in Central America and the Southwestern United States. Like other members of its genus, it possesses two separate pairs of compound eyes—one pair viewing above and one below the water surface—an adaptation for simultaneous aerial and underwater vision. Neuroanatomical studies have shown this species exhibits a unique sensory modality switch: its mushroom body calyces, brain structures typically associated with olfactory processing in insects, receive exclusive visual input from the dorsal eye optic lobes rather than olfactory input.
Gyretes
Gyretes is a genus of whirligig beetles (family Gyrinidae) containing approximately 181 species, primarily distributed in the Neotropics. Adults are aquatic surface-dwelling beetles found in freshwater habitats. The genus is characterized by specific morphological features of the reproductive tracts and immature stages that distinguish it from other gyrinid genera. Larval stages have been described for several species, with distinctive chaetotaxy patterns.
Gyretes iricolor
Gyretes iricolor is a species of whirligig beetle described by Young in 1947. It is one of three genera of Gyrinidae occurring in Missouri and the central United States, alongside Dineutus and Gyrinus. The genus Gyretes has been documented from 64 of 75 Arkansas counties and is considered common throughout the Ozark region. Like other whirligig beetles, members of this genus inhabit the surface film of freshwater bodies.
Gyretes sinuatus
Gyretes sinuatus is a whirligig beetle (family Gyrinidae) inhabiting freshwater systems of North America. Like other gyrinids, it lives on the water surface where it feeds and forms aggregations. The genus Gyretes represents the third North American gyrinid genus alongside Dineutus and Gyrinus, and has been documented across the Ozark region and Arkansas. This species was described by LeConte in 1852.
Gyretes torosus
Gyretes torosus is a species of whirligig beetle in the family Gyrinidae. The species was described from North America in 2004. As a member of Gyretes, it belongs to a genus that is common in the Ozark region and eastern North America. Like other whirligig beetles, it is presumed to inhabit the surface of freshwater bodies. The specific epithet 'torosus' refers to a muscular or bulging appearance, likely describing some aspect of the species' morphology.
Gyrinus
whirligig beetle
Gyrinus is a genus of small aquatic beetles in the family Gyrinidae, commonly known as whirligig beetles. Members are strictly aquatic and live almost exclusively on the water surface, where they form conspicuous aggregations 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.
Gyrinus aeratus
Brass Whirligig Beetle
Gyrinus aeratus is a species of whirligig beetle in the family Gyrinidae, commonly known as the Brass Whirligig Beetle. It is found in both North America and Europe, representing a trans-Atlantic distribution pattern. Like other whirligig beetles, it is adapted to life on the water surface where it forms aggregations and exhibits characteristic erratic swimming behavior.
Gyrinus dichrous
whirligig beetle
Gyrinus dichrous is a species of whirligig beetle in the family Gyrinidae. It is found in North America, with distribution records from Canada (Nova Scotia, Ontario, Québec) and the United States. Whirligig beetles in the genus Gyrinus are generally smaller than those in the related genus Dineutus, with Gyrinus species typically measuring 5–8 mm in length compared to 10–12 mm for Dineutus. Members of this genus are distinguished by their visible scutellum, unlike Dineutus where the scutellum is concealed.
Gyrinus dubius
Gyrinus dubius is a species of whirligig beetle in the family Gyrinidae. The species was described by Wallis in 1926 and is native to North America, with records from Canada including Labrador, Manitoba, and Newfoundland. As a member of the Gyrinidae, it shares the family's characteristic surface-dwelling aquatic lifestyle and rapid, erratic swimming behavior.
Gyrinus latilimbus
Gyrinus latilimbus is a species of whirligig beetle in the family Gyrinidae, described by Fall in 1922. As a member of the genus Gyrinus, it belongs to the smaller of the two genera of whirligig beetles found in North America. Whirligig beetles are highly specialized aquatic insects that inhabit the water surface film, where they exhibit characteristic rapid, erratic circling movements in aggregations called rafts. The genus Gyrinus is distinguished from the larger genus Dineutus primarily by smaller body size and exposed scutellum.
Gyrinus lecontei
Gyrinus lecontei is a species of whirligig beetle in the family Gyrinidae, described by Fall in 1922. It occurs in North America, with distribution records from Canada (New Brunswick, Nova Scotia, Ontario) and presumably the United States. Like other members of the genus Gyrinus, it is expected to inhabit the surface of freshwater bodies. Specific details about its ecology and behavior remain poorly documented in the available literature.
Gyrinus marginellus
whirligig beetle
Gyrinus marginellus is a species of whirligig beetle in the family Gyrinidae, described by Fall in 1922. It occurs in North America, with records from Canada (Québec) and the United States. Like other members of the genus Gyrinus, it is an aquatic beetle that lives on the water surface. The species is part of a taxonomically challenging group where identification often requires examination of ventral characters.
Gyrinus minutus
whirligig beetle
Gyrinus minutus is a small whirligig beetle with a Holarctic distribution spanning northern North America and Eurasia. It is distinguished from congeners by its weak swimming ability, solitary behavior among emergent vegetation, and near-absence of volatile defensive compounds. The species exhibits a shortened life cycle of approximately seven weeks from egg to adult and is capable of flight, allowing colonization of new water bodies throughout the summer.
Gyrinus pachysomus
whirligig beetle
Gyrinus pachysomus is a species of whirligig beetle described by Fall in 1922. Like other members of the family Gyrinidae, this species inhabits the surface of freshwater bodies where it exhibits characteristic erratic, circling swimming behavior. The species is known from North America, though specific details regarding its biology and ecology remain limited in published literature.
Gyrinus parcus
Gyrinus parcus is a species of whirligig beetle in the family Gyrinidae. It has a broad geographic distribution spanning Central America, North America, and South America. The species was described by Thomas Say in 1834 and includes six recognized subspecies. Whirligig beetles in the genus Gyrinus are small, surface-dwelling aquatic beetles known for their rapid, erratic swimming behavior and tendency to form aggregations on still or slow-moving water.
Gyrinus pectoralis
whirligig beetle
Gyrinus pectoralis is a species of whirligig beetle in the family Gyrinidae, first described by LeConte in 1868. It is found across North America, with records from Canada (Alberta, British Columbia, Labrador) and presumably throughout much of the United States. Like other whirligig beetles, it inhabits the surface waters of freshwater systems.
Gyrinus pugionis
whirligig beetle
Gyrinus pugionis is a species of whirligig beetle in the family Gyrinidae, found in North America. Like other members of the genus, it inhabits the surface of freshwater bodies where it exhibits characteristic erratic, circular swimming patterns. The species was described by Fall in 1922. Specific details regarding its biology and ecology remain limited in published literature.
Spanglerogyrus
Spanglerogyrus is a monotypic genus of whirligig beetles (family Gyrinidae) containing the single species S. albiventris. It represents the only living member of the subfamily Spanglerogyrinae, the earliest diverging extant lineage of gyrinid beetles. The genus was described in 1979 from specimens collected in southern Alabama, making it a rare example of a relictual aquatic beetle lineage in North America.
Spanglerogyrus albiventris
Spanglerogyrus albiventris is a whirligig beetle in the family Gyrinidae, described in 1979 from specimens collected in southern Alabama. It is the sole extant species in its genus and the only living member of the subfamily Spanglerogyrinae, which represents the earliest diverging lineage among extant gyrinids. The subfamily also includes the extinct genus Angarogyrus from the Jurassic and Cretaceous of Asia.