Seed-predation
Guides
Acanthoscelides quadridentatus
Acanthoscelides quadridentatus is a seed beetle (Bruchinae) native to the Americas with introduced populations in Australia and southern Asia. In its native Brazilian Cerrado range, it exhibits phenotypic plasticity with two distinct morphs: melanic individuals that are approximately 1.1-fold larger, and lighter, smaller individuals. The species is a specialist seed predator of Mimosa setosa, attacking both M. setosa var. paludosa and M. setosa var. setosa. Attacked seeds fail to germinate, making this beetle a significant mortality factor for its host plant.
Amblycerus
pea and bean weevils, seed beetles
Amblycerus is the second most diverse genus of seed beetles in the Americas, containing over 60 described species. These bruchid beetles are specialized seed predators, with larvae developing inside seeds of various host plants. The genus exhibits complex evolutionary patterns of host plant association, having radiated from an ancestral association with Fabaceae into at least 12 other plant families including Sterculiaceae, Boraginaceae, and Humiriaceae. Species-level identification requires examination of male genitalia and pygidial morphology.
Amblycerus vitis
Arizona Grape Bruchid
Amblycerus vitis is a seed beetle (subfamily Bruchinae) commonly known as the Arizona Grape Bruchid. The species is a specialist herbivore associated with wild grape species in the genus Vitis, particularly in arid regions of the southwestern United States. As a member of the tribe Amblycerini, it exhibits the typical bruchid life history of larval development within seeds.
Aulacoscelidinae
Aulacoscelidinae is a small beetle subfamily containing 19 species. Adults feed on foliage and juices of New World cycads. Larvae develop within cycad megagametophytes, representing a specialized seed-predation relationship. The group has been historically classified within Chrysomelidae or as a separate family.
Chaetorellia
Chaetorellia is a genus of tephritid fruit flies (family Tephritidae) containing approximately 11 described species. Species in this genus are specialists on Asteraceae flower heads, with larvae developing within capitula and feeding on developing florets and seeds. Several species have been investigated or deployed as biological control agents against invasive thistles and knapweeds, particularly yellow starthistle (Centaurea solstitialis). The genus is characterized by distinctive morphological features and host-specificity patterns that have been taxonomically revised.
Coleophora
Casebearers, Case-bearing moths
Coleophora is a large genus of case-bearing moths in the family Coleophoridae, comprising approximately 1,350 described species. The genus occurs on all continents but is most diverse in the Nearctic and Palaearctic regions. Larvae construct distinctive portable silken cases from host plant material, which serve as key identification characters and provide protection. Many species exhibit narrow host plant specificity, with larvae feeding on seeds, flowers, or leaves.
Gryllus pennsylvanicus
Fall Field Cricket
Gryllus pennsylvanicus, commonly known as the fall field cricket, is a widespread North American cricket species distinguished by its autumn breeding season and distinctive chirping. Adults are medium-sized crickets, 15–25 mm in length, with dark black to dark brown coloration and occasionally a slight reddish tint. The species is notable for its temperature-dependent chirping rate, which has been used as a biological thermometer. Males produce calling songs from burrow entrances to attract females, with older males typically preferred by females. The species has an annual life cycle with one generation per year, overwintering as eggs in soil.
Lygaeidae
seed bugs, milkweed bugs, ground bugs
Lygaeidae is a family of true bugs (Hemiptera: Heteroptera) commonly known as seed bugs, milkweed bugs, or ground bugs. The family currently comprises approximately 60 genera in six subfamilies, though it was formerly much larger before numerous subfamilies were elevated to independent family status. Members are distributed worldwide and exhibit diverse feeding habits, with many species feeding on seeds, some on sap or seed pods, others being omnivores, and a few being insectivores. Several genera, including Lygaeus and Oncopeltus, are well-known for their association with milkweeds and their bright aposematic coloration.
Orsodacnidae
Ravenous Leaf Beetles
Orsodacnidae is a small family of leaf beetles (Coleoptera: Chrysomeloidea) that was historically classified as a subfamily of Chrysomelidae but is now recognized as distinct. The family contains two subfamilies: Aulacoscelidinae (genera Aulacoscelis, Janbechynea) and Orsodacninae (genus Orsodacne). Members of this family exhibit specialized feeding relationships with cycads and other plants, with documented seed predation by immature stages and folivory by adults.
Pachymerus
Pachymerus is a genus of seed beetles in the subfamily Bruchinae (formerly Bruchidae), family Chrysomelidae. Species in this genus are specialized seed predators of palms (Arecaceae), with documented associations including Syagrus coronata (licuri palm), Syagrus romanzoffiana (queen palm), and babassu palms (Orbinya spp.). The genus has been studied for its tritrophic interactions with parasitoid wasps, particularly Heterospilus species, and its role in palm seed predation in Neotropical ecosystems.
Pachymerus nucleorum
Coconut Borer
Pachymerus nucleorum is a bruchine seed beetle that develops within palm seeds, primarily attacking species in the Arecaceae family. Larvae feed on endosperm inside hard-shelled fruits, with documented hosts including babassu palm (Attalea/Orbinya spp.), licuri palm (Syagrus coronata), and queen palm (Syagrus romanzoffiana). The species occurs in Brazilian biomes including Caatinga and Atlantic Forest remnants, where it functions as a primary seed predator. Adults are subject to parasitism by braconid wasps, particularly Heterospilus prosopodis. The species has been observed in both natural vegetation and managed habitats, with parasitism rates varying by habitat complexity.
Pogonomyrmex californicus subnitidus
Pogonomyrmex californicus subnitidus is a subspecies of the California harvester ant, a seed-collecting ant native to arid regions of western North America. Like other harvester ants, it constructs conspicuous nest disks cleared of vegetation and plays significant ecological roles as a seed predator, soil engineer, and food source for vertebrate predators. The species possesses a powerful sting used defensively against mammalian threats. This subspecies is part of a taxon increasingly recognized as a keystone species in desert ecosystems rather than an agricultural pest.
Pogonomyrmex hoelldobleri
Hoelldobler's Harvester Ant
Pogonomyrmex hoelldobleri is a seed-harvesting ant species described in 2013 from the Mohave and Sonoran Deserts of North America. It was previously confused with P. magnacanthus but differs in having normally sized eyes, cephalic rugae that converge posterior to the eyes near the vertex, mandibles with seven teeth, and moderately to strongly granulate interrugal spaces on pronotal sides. Molecular phylogenetic analysis supports its close relationship with P. magnacanthus and P. mohavensis within the P. californicus species group.
Pogonomyrmex salinus
Owyhee Harvester Ant
Pogonomyrmex salinus is a harvester ant species native to sagebrush-steppe habitats of the western United States. A 5-year field study in southwestern Idaho documented colony dynamics and vegetation associations, finding population density inversely related to sagebrush cover and positively associated with non-cheatgrass understory vegetation. The species avoids cheatgrass seeds in its diet, preferring small-seeded grasses and forbs. Colony survival rates improve after the first year, with 12.4% first-year failure compared to 4.6–8.4% in subsequent years.
Pogonomyrmex tenuispinus
Pogonomyrmex tenuispinus is a species of harvester ant in the genus Pogonomyrmex. Like other members of this genus, it is a seed-collecting ant native to arid regions. The species was described by Auguste Forel in 1914. As a harvester ant, it likely participates in seed dispersal and ecosystem engineering through nest construction, though specific ecological studies for this species are limited.
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