Field-cricket
Guides
Gryllus
field cricket
Gryllus is a widespread genus of field crickets in the family Gryllidae, with members found across Africa, the Americas, Europe, and Asia. Adults typically measure 15–31 mm and are darkly colored. Species in this genus are often difficult to distinguish from related genera based on external morphology alone; male genitalia, particularly the structure of the epithallus, provide more reliable identification characters. The genus has been extensively studied for its acoustic communication, with male calling songs used for mate attraction and territorial defense.
Gryllus alogus
Gryllus alogus is a species of field cricket described by Rehn in 1902. It is currently recognized as a synonym of Gryllus vocalis (Gryllus (Gryllus) vocalis). The species was originally described from specimens collected in California. As a member of the genus Gryllus, it shares the general characteristics of field crickets, including acoustic communication through stridulation.
Gryllus assimilis
Jamaican field cricket, silent cricket (misnomer)
Gryllus assimilis, the Jamaican field cricket, is a field cricket species native to the West Indies, southern United States, Mexico, and parts of South America. It is distinguished from similar species primarily by its song: a short, pulsed chirp with rapid pulse rate and brief intervals between pulses, creating a nearly continuous sound. Since 2010, it has become widely bred as a feeder insect for the pet industry throughout North America and Europe, largely replacing the house cricket (Acheta domesticus) after that species was devastated by cricket paralysis virus. The species is notable for its immunity to this virus, its relatively docile behavior compared to some other Gryllus species used in the pet trade, and its status as a USDA-approved native species for commercial sale in the United States.
Gryllus brevicaudus
Short-tailed Field Cricket
Gryllus brevicaudus, commonly known as the short-tailed field cricket, is a species of field cricket in the family Gryllidae. It was described by Weissman, Rentz, and Alexander in 1980. The species is found in North America, with distribution records from California. As a member of the genus Gryllus, it shares characteristics with other field crickets, though specific details distinguishing it from congeners are limited in available sources.
Gryllus fultoni
Southern Wood Cricket
Gryllus fultoni, the southern wood cricket, is a field cricket species found in the southeastern United States. It overwinters as a juvenile and matures in spring, inhabiting forested environments. The species produces a distinctive calling song consisting of fast-pulsed chirps. In areas of sympatry with Gryllus vernalis, G. fultoni exhibits reproductive character displacement, with divergence in calling song characters and mirror area that enhances reproductive isolation.
Gryllus integer
Western Trilling Cricket
Gryllus integer, the western trilling cricket, is a field cricket species distinguished by its nearly continuous trilling song rather than discrete chirps. It occurs in the western United States, where males produce species-specific calling songs to attract females. The species has been extensively studied for its behavioral ecology, including alternative mating tactics, personality traits, and antipredator responses. Populations show geographic variation in song structure, with some California males producing chirped songs rather than continuous trills.
Gryllus lineaticeps
Variable Field Cricket
Gryllus lineaticeps, the variable field cricket, is a North American field cricket species distinguished by its flexible mate-searching behavior. Females exhibit phonotaxis toward male calling songs and adjust their preferences based on acoustic experience, rejecting lower-quality songs after exposure to more attractive alternatives. Males produce energetically costly calls, with oxygen consumption increasing 2.7 times basal rates during chirping. The species undergoes flight muscle histolysis during the transition from dispersal to reproduction, with autophagy selectively breaking down dorsal longitudinal flight muscles while preserving dorsoventral muscles for walking. Thermal preferences vary across the diel cycle and shift in response to starvation, reflecting life history trade-offs between activity and energy conservation.
Gryllus multipulsator
Long-chirp Field Cricket
Gryllus multipulsator is a field cricket species described by Weissman in 2009, known by the common name Long-chirp Field Cricket. It belongs to the genus Gryllus, which includes many common field crickets found in North America. The species is distinguished by its characteristic long chirp pattern. It is native to California and has been documented through 90 iNaturalist observations.
Gryllus personatus
Badlands Cricket, Badlands Field Cricket
Gryllus personatus, commonly known as the badlands cricket or badlands field cricket, is a species of field cricket in the family Gryllidae. It inhabits arid and semi-arid regions of southwestern North America, including desert and dry grassland environments. The species is named for its association with badlands terrain. Like other field crickets in the genus Gryllus, it produces characteristic chirping sounds through stridulation of specialized wing structures.
Gryllus rubens
Southeastern field cricket
Gryllus rubens, the southeastern field cricket, is a trilling field cricket native to the southeastern United States. It is a cryptic sister species to G. texensis, from which it originated via peripatric speciation. The species exhibits remarkable phenotypic plasticity in its communication system, with male calling songs and female preferences shifting reversibly between spring and fall generations in response to temperature. Wing polymorphism is environmentally and genetically influenced, with long-winged morphs appearing in spring/summer and short-winged morphs predominating in autumn/winter.
Gryllus saxatilis
Western Rock-loving Field Cricket
Gryllus saxatilis is a species of field cricket described in 2019. It belongs to the genus Gryllus, which includes several North American field cricket species. Like other Gryllus species, it is expected to share characteristics such as chirping communication, ground-dwelling habits, and annual life cycles. The specific epithet "saxatilis" (rock-loving) suggests an association with rocky habitats.
Gryllus texensis
Texas Trilling Cricket
Gryllus texensis is a field cricket species described by Cade and Otte in 2000, distinguished from the morphologically similar Gryllus rubens by differences in call song structure. The species was previously misidentified as Gryllus integer in collections from the southeastern United States. It belongs to a closely related complex of Gryllus field crickets and is phylogenetically most closely related to G. rubens based on mitochondrial DNA analysis.
Gryllus thinos
Texas Beach Field Cricket
Gryllus thinos is a field cricket species described in 2019 from Texas coastal habitats. Commonly known as the Texas Beach Field Cricket, it inhabits sandy beach environments, distinguishing it from other Gryllus species that typically occupy inland grasslands and fields. The species is characterized by its specialized coastal habitat association and relatively recent taxonomic recognition.
Gryllus vernalis
Northern Wood Cricket
Gryllus vernalis, the northern wood cricket, is a species of field cricket endemic to deciduous woodlands of the midwestern United States. It is distinguished by its predominantly black exoskeleton, occasionally marked with red patches on the femora, and a notably wide pronotum. The species inhabits leaf litter and shows evidence of reproductive isolation mechanisms, particularly strong female discrimination against heterospecific mates in sympatric populations.
Melanoplus davisi
Melanoplus davisi is a species of spur-throated grasshopper in the family Acrididae, described by Hebard in 1918 from the southeastern United States. It belongs to the large genus Melanoplus, which contains numerous economically and ecologically significant grasshopper species. The species appears to be relatively poorly documented in the primary grasshopper literature of the western United States, suggesting it may be of limited distribution or abundance compared to more widespread Melanoplus species.
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leniusculus
Signal Crayfish
The signal crayfish is a large North American freshwater crayfish introduced to Europe in the 1960s to replace declining native fisheries. It has become one of the most ecologically impactful invasive decapods in Europe, outcompeting native crayfish and serving as a carrier of crayfish plague (Aphanomyces astaci). The species establishes self-sustaining populations rapidly, with six age cohorts documented within a few years of introduction. It shows sex- and size-specific coloration patterns, with males displaying more saturated and brighter ventral claw surfaces than females, suggesting a role in intraspecific communication.
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