Weevil
Guides
Scaphomorphus puberulus
Scaphomorphus puberulus is a species of weevil in the family Curculionidae, described by LeConte in 1876. It belongs to the genus Scaphomorphus, a group of lixine weevils found in North America. The species is documented from the Canadian provinces of Alberta and Manitoba, though specific details about its biology, host associations, and ecology remain poorly known in published literature.
Scaphomorphus subcylindricus
Scaphomorphus subcylindricus is a species of weevil in the family Curculionidae. It is endemic to Florida, where it has been collected in dry oak/pine sandhill woodland habitats. The species is associated with the endemic plant Lupinis ocalensis (Ocala lupine), on whose foliage it has been observed. The species was documented during field surveys in the Citrus Wildlife Management Area of Withlacoochee State Forest.
Scaphomorphus texanus
Scaphomorphus texanus is a weevil species in the family Curculionidae. The genus Scaphomorphus is endemic to North America. No specific ecological or behavioral information has been documented for this particular species in available sources.
Scaphomorphus trivittatus
Scaphomorphus trivittatus is a species of weevil in the family Curculionidae. The species was originally described by Thomas Say in 1832 and has historically been known under the synonym Boisea trivittatus. It is native to western Canada and is not the same organism as the boxelder bug (Boisea trivittata), a common true bug that shares a similar former scientific name. The species has been recorded in Alberta, British Columbia, Manitoba, and Saskatchewan.
Schizomicrus caecus
Schizomicrus caecus is a species of weevil described by Casey in 1892. The specific epithet "caecus" (Latin for "blind") suggests possible eye reduction or loss, a trait associated with subterranean or cryptic lifestyles in some beetle groups. It belongs to the family Brachyceridae, a small family of weevils within the superfamily Curculionoidea. The species is known from North America, though detailed biological information remains limited.
Sciaphilus
Sciaphilus is a genus of weevils in the family Curculionidae, subfamily Entiminae, tribe Sciaphilini. The genus contains at least two described species: Sciaphilus asperatus and S. costulatus. Species are distributed across Europe, Northern America, and parts of Asia. The best-studied species, S. asperatus, is wingless, parthenogenetic, and polyphagous.
Scyphophorus
agave weevils, sisal weevils
Scyphophorus is a genus of snout and bark beetles in the subfamily Dryophthorinae, comprising approximately seven described species. The genus is best known for Scyphophorus acupunctatus, commonly called the agave weevil or sisal weevil, which is a major pest of agave crops worldwide. Species in this genus are native to the Americas but have been introduced to multiple continents through global plant trade. The genus is characterized by its association with plants in the families Asparagaceae (Agavoideae) and Asparagaceae (Nolinoideae, formerly Dracaenaceae).
Sibariops
flower weevils
Sibariops is a genus of flower weevils in the beetle family Curculionidae, established by Thomas L. Casey in 1920. The genus contains more than 80 described species. The name Sibariops is masculine in gender, following ICZN Article 30.1.4.3, which specifies that compound genus-group names ending in -ops are treated as masculine regardless of derivation.
Sibariops concinnus
Sibariops concinnus is a species of weevil in the family Curculionidae. The genus Sibariops belongs to the hyperdiverse weevil family, which contains more described species than any other beetle family. Information regarding the specific biology, distribution, and natural history of S. concinnus remains extremely limited in published literature.
Sibinia inermis
huisache sibinia weevil
Sibinia inermis, known as the huisache sibinia weevil, is a species of leguminous seed weevil in the beetle family Curculionidae. The species was described by Clark in 1978. It is found in North America, with limited observational records available.
Sibinia pallida
Ebony Sibinia Weevil
Sibinia pallida is a species of leguminous seed weevil in the beetle family Curculionidae. First described by Schaeffer in 1908, this small weevil occurs in North America. Members of the genus Sibinia are known to feed on seeds of leguminous plants. The species has been documented through limited observations, with records indicating presence in North American habitats.
Sibinia ruidula
Sibinia ruidula is a species of leguminous seed weevil in the family Curculionidae, described by Clark in 1978. It belongs to the tribe Tychiini, a group of weevils specialized on legume seeds. The species is known from North America. Very few observations exist in public databases.
Sibinia setosa
leguminous seed weevil
Sibinia setosa is a species of weevil in the family Curculionidae, described by Clark in 1978. It belongs to the genus Sibinia, commonly known as leguminous seed weevils. The species is recorded from North America. As a member of Curculionidae, it possesses the characteristic elongated rostrum typical of weevils.
Sibinia transversa
Sibinia transversa is a small weevil species in the family Curculionidae, described by Clark in 1978. It belongs to the genus Sibinia, a group of seed weevils within the snout beetle family. The species is recorded from North America, excluding Mexico, though detailed ecological and biological information remains limited in available literature.
Sicoderus
Sicoderus is a genus of true weevils (Curculionidae) established by Vanin in 1986. The genus contains more than 75 described species globally, with substantial diversity in the West Indies where 32 species have been documented. Most species are small, dark-colored weevils with characteristic rostrum morphology typical of the tribe Erodiscini.
Sitona aquilonius
Sitona aquilonius is a species of weevil in the family Curculionidae, described by Bright in 1994. It is known from high-latitude regions of North America including Alaska, the Yukon Territory, and the Northwest Territories. Like other members of the genus Sitona, it is expected to be associated with leguminous plants, though specific host records for this species are not documented in available sources.
Sitona cockerelli
Sitona cockerelli is a weevil species in the family Curculionidae, originally described by Blaisdell in 1938. According to GBIF taxonomy, this name is currently treated as a synonym of Sitones californius. The genus Sitona includes species associated with leguminous plants, though specific details for S. cockerelli are sparse in the available literature.
Sitona cylindricollis
sweetclover weevil
Sitona cylindricollis, the sweetclover weevil, is a broad-nosed weevil in the family Curculionidae. It is a documented agricultural pest of sweet clover (Melilotus officinalis) and alfalfa/lucerne (Medicago sativa). Adults feed on above-ground foliage, causing defoliation damage that is most severe during late summer critical periods. Larvae feed on root nodules and root tissue underground. The species exhibits temperature- and light-dependent dispersal flight behavior, with peak flight activity occurring in morning hours when ambient temperatures reach threshold levels.
Sitona lineellus
alfalfa curculio
Sitona lineellus, commonly known as the alfalfa curculio, is a broad-nosed weevil in the family Curculionidae. The species is found in North America, with distribution records from Canada (Alberta, British Columbia) and the United States. It is associated with alfalfa and legume crops, though specific ecological details remain limited in published literature. Two subspecies are recognized: S. l. crinitoides and S. l. samniticus.
Sitophilus oryzae
Rice Weevil
Sitophilus oryzae, commonly known as the rice weevil, is a cosmopolitan stored product pest that infests rice, wheat, maize, and other cereal grains. Adults are small reddish-brown beetles with a distinctive elongated snout and four reddish-brown spots on the elytra. The species has a complete metamorphosis life cycle with egg, larval, pupal, and adult stages, all completed within grain kernels. Females lay eggs inside grains, and larvae develop entirely within the kernel, making infestations difficult to detect until adults emerge.
Smicraulax arizonicus
Smicraulax arizonicus is a species of true weevil in the beetle family Curculionidae, first described by Sleeper in 1954. The specific epithet "arizonicus" indicates its association with Arizona. It is known from North America, with its distribution centered in the southwestern United States. Like other members of the genus Smicraulax, it belongs to a group of small weevils whose biology remains poorly documented.
Smicraulax tuberculatus
Smicraulax tuberculatus is a species of weevil in the family Curculionidae, described by W.D. Pierce in 1908. It belongs to a genus of small weevils within the hyperdiverse Curculionidae, the largest family of beetles. The species is currently provisionally accepted in taxonomic databases and has been recorded from North America. Very little specific biological information is available for this particular species.
Smicronyx albonotatus
Smicronyx albonotatus is a species of true weevil in the beetle family Curculionidae. It was described by Anderson in 1962. The species is known from North America. As a member of the genus Smicronyx, it belongs to a group of seed weevils associated with plants in the sunflower family (Asteraceae), though specific host associations for this species remain undocumented.
Smicronyx centralis
Smicronyx centralis is a species of true weevil in the family Curculionidae, described by Anderson in 1962. It is known from North America, with confirmed records from the Canadian provinces of Alberta and Saskatchewan. Like other members of the genus Smicronyx, it is likely associated with sunflower plants (Helianthus spp.), though specific ecological details for this species remain poorly documented. The genus includes economically important seed weevils that are pests of cultivated sunflower crops.
Smicronyx commixtus
Smicronyx commixtus is a species of true weevil in the beetle family Curculionidae, first described by Dietz in 1894. It is native to North America, with records from the Canadian provinces of Alberta, Manitoba, and Saskatchewan. The genus Smicronyx includes several seed weevil species associated with sunflowers, though specific ecological details for S. commixtus remain poorly documented. Most information about Smicronyx ecology derives from studies of the economically significant species S. fulvus and S. sordidus.
Smicronyx constrictus
Smicronyx constrictus is a species of true weevil in the family Curculionidae, native to North America. The genus Smicronyx contains seed weevils associated with plants in the Asteraceae family, including sunflowers. Specific ecological details for S. constrictus are poorly documented in available sources, though congeners are known as seed-feeding pests of cultivated sunflowers.
Smicronyx corniculatus
Smicronyx corniculatus is a species of true weevil in the family Curculionidae. It is native to North America, with records from Canada (New Brunswick, Ontario, Québec). Like other members of the genus Smicronyx, this species is likely associated with sunflower (Helianthus) or related Asteraceae hosts, though specific ecological details for this species are poorly documented. The genus Smicronyx includes seed-feeding weevils that are economically significant pests of cultivated sunflowers.
Smicronyx corpulentus
Smicronyx corpulentus is a species of seed weevil in the family Curculionidae, described by LeConte in 1876. It is native to North America and belongs to a genus whose members are primarily associated with sunflower seeds as pests. Specific ecological details for this species remain poorly documented in published literature.
Smicronyx discoideus
Disc-shaped Weevil
Smicronyx discoideus is a species of true weevil in the family Curculionidae. It is native to North America, with records from Canadian provinces including Manitoba, Ontario, and Saskatchewan. The species was described by Casey in 1892. Beyond basic taxonomic placement and geographic distribution, little specific biological information is documented for this species.
Smicronyx flavicans
Smicronyx flavicans is a species of seed weevil in the family Curculionidae, described by LeConte in 1876. It is native to North America, with records from Ontario, Canada. The genus Smicronyx includes several sunflower-associated seed weevils that are agricultural pests, though specific details about this particular species remain sparse in published literature.
Smicronyx halophilus
Smicronyx halophilus is a species of true weevil in the beetle family Curculionidae. It was described by Blatchley in 1920. The species is found in North America. Beyond these basic taxonomic and distributional facts, little specific information has been documented about its biology or ecology.
Smicronyx incertus
Smicronyx incertus is a species of true weevil in the family Curculionidae, described by Anderson in 1962. The species is known from North America, with confirmed records from Manitoba, Canada. As a member of the genus Smicronyx, it belongs to a group commonly referred to as seed weevils, though specific ecological details for this particular species remain undocumented in the available literature.
Smicronyx interruptus
Smicronyx interruptus is a species of true weevil in the family Curculionidae, described by Blatchley and Leng in 1916. The species is known from North America. Beyond basic taxonomic information, detailed biological data for this specific species appears sparse in available literature. It belongs to a genus containing several seed weevil species associated with sunflowers, though explicit host records for S. interruptus specifically have not been documented in the provided sources.
Smicronyx pinguis
Smicronyx pinguis is a species of true weevil in the beetle family Curculionidae. It was described by Blatchley and Leng in 1916 and is known from North America, with records from Ontario, Canada. The genus Smicronyx includes seed weevils, many of which are associated with sunflower and other Asteraceae hosts, though specific biological information for S. pinguis remains sparse.
Smicronyx quadrifer
white dodder weevil
Smicronyx quadrifer, commonly known as the white dodder weevil, is a species of true weevil in the family Curculionidae. It is found in North America. Very little specific information is documented about this species compared to its congenerics.
Smicronyx rhodopus
Smicronyx rhodopus is a species of true weevil in the beetle family Curculionidae. It is native to North America and belongs to a genus that includes several seed-feeding species associated with sunflowers. Specific biological details for this particular species remain poorly documented in available literature.
Smicronyx sculpticollis
dodder gall weevil
Smicronyx sculpticollis is a true weevil in the family Curculionidae, commonly known as the dodder gall weevil. It is found in North America, with confirmed records from Ontario, Canada. The species is provisionally accepted in taxonomic databases. Little specific information is available about its biology, though the common name suggests an association with dodder (Cuscuta), a parasitic plant genus.
Smicronyx squalidus
Smicronyx squalidus is a species of true weevil in the family Curculionidae, first described by Casey in 1892. It belongs to a genus of seed weevils associated with sunflowers and related plants. The species is recorded from North America, including Ontario, Canada. Very little specific information is available for this particular species compared to its better-known congeners.
Smicronyx tesselatus
Smicronyx tesselatus is a species of true weevil in the beetle family Curculionidae. The genus Smicronyx comprises seed weevils associated with plants in the Asteraceae family, particularly sunflowers (Helianthus spp.). Several congeners in this genus are significant agricultural pests of cultivated sunflowers, though specific documentation for S. tesselatus is limited. The species was referenced in a 2021 Texas collecting trip report where it was initially misidentified as a lightly marked specimen of the related species Goes tesselatus, a cerambycid beetle.
Smicronyx triangularis
Smicronyx triangularis is a species of true weevil in the beetle family Curculionidae. It was described by Anderson in 1962. The species is recorded from North America. Very little specific information about its biology, host associations, or ecology has been documented in available sources.
Smicronyx vestitus
Smicronyx vestitus is a species of true weevil in the beetle family Curculionidae, first described by Casey in 1892. The genus Smicronyx includes seed weevils that are associated with sunflowers and other plants in the Asteraceae family. Some congeners, such as Smicronyx fulvus and Smicronyx sordidus, are recognized agricultural pests of sunflower crops. The specific biology and host associations of S. vestitus remain poorly documented in published literature.
Sphenophorus
billbugs
Sphenophorus is a large genus of weevils commonly known as billbugs, containing approximately 278 species. Several species are significant agricultural pests, particularly of turfgrass, corn, and orchardgrass. The genus is taxonomically challenging due to morphological similarity among species, especially at larval stages. Research has focused on developing molecular identification tools to distinguish species and understand their variable seasonal biology across regions.
Sphenophorus aequalis
clay-colored billbug, clay-coloured billbug
Sphenophorus aequalis, commonly known as the clay-colored billbug, is a weevil species in the family Dryophthoridae (formerly placed in Curculionidae). It occurs in North America and is associated with wetland and riparian habitats. Adults are active during summer months and have been observed mating and burrowing at the base of sedges and other emergent vegetation near water margins. Like other billbugs, it is part of a species complex that can be difficult to distinguish morphologically, particularly at the larval stage.
Sphenophorus aequalis ochreus
clay-colored billbug
Sphenophorus aequalis ochreus is a subspecies of the clay-colored billbug, a weevil in the family Curculionidae. Billbugs are significant turfgrass and agricultural pests whose larvae bore into plant stems, roots, and crowns. This subspecies has been documented in association with saltmarsh bulrush stands near alkaline lake margins in New Mexico, where adults were observed walking, mating, and burrowing into soil at the base of plants. The species complex presents identification challenges due to morphological similarities among related billbug taxa.
Sphenophorus aequalis pictus
Sphenophorus aequalis pictus is a subspecies of weevil in the family Curculionidae. It belongs to the genus Sphenophorus, commonly known as billbugs, which are recognized for their elongated snouts and association with grasses and sedges. The nominate species S. aequalis is part of a complex of billbug species that can be difficult to distinguish morphologically.
Sphenophorus arizonensis
Sphenophorus arizonensis is a billbug weevil species in the family Dryophthoridae, described by Horn in 1873. It is native to North America and belongs to a genus containing multiple economically significant turfgrass and crop pests. Like other Sphenophorus species, it likely develops within grass stems and roots, though specific biological details for this species remain poorly documented.
Sphenophorus australis
Tule Billbug
Sphenophorus australis, commonly known as the Tule Billbug, is a weevil species in the family Dryophthoridae. It is found in North America, with distribution records including the northeastern United States. The species was described by Chittenden in 1905. Two subspecies are recognized: Sphenophorus australis australis and Sphenophorus australis abrasus.
Sphenophorus australis abrasus
Sphenophorus australis abrasus is a subspecies of weevil in the family Curculionidae. Members of the genus Sphenophorus, commonly known as billbugs, are recognized as significant agricultural pests. The specific subspecies designation suggests geographic or morphological differentiation from the nominate form, though detailed published accounts of this particular subspecies appear limited.
Sphenophorus bartramiae
Sphenophorus bartramiae is a species of weevil in the family Dryophthoridae. It was described by Chittenden in 1924. The species is known to occur in North America. Like other members of the genus Sphenophorus, it is a billbug weevil, though specific biological details remain poorly documented compared to economically significant congeners such as the bluegrass billbug or southern corn billbug.
Sphenophorus blanchardi
Sphenophorus blanchardi is a species of weevil in the family Dryophthoridae, described by Chittenden in 1905. It is native to North America and belongs to a genus containing multiple species that are significant agricultural pests, though specific information about this particular species is limited.