Gyrinidae
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 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 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 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.
Gyrininae
whirligig beetles, gyrinine beetles
Gyrininae is the largest subfamily of Gyrinidae, containing over 740 described extant species. These beetles are commonly known as whirligig beetles for their characteristic circling behavior on water surfaces. The subfamily comprises three tribes: Dineutini, Gyrinini, and Orectochilini, with genera distributed across all major biogeographic regions. Members occupy diverse freshwater habitats from lentic to lotic systems.
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 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 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 plicifer
whirligig beetle
Gyrinus plicifer is a species of whirligig beetle in the family Gyrinidae. It occurs in North America, with records from British Columbia, Canada. Like other members of the genus, it inhabits the surface of freshwater bodies where it forms aggregations. The species was described by LeConte in 1852.
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 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.