Seasonal-dimorphism
Guides
Anaea
leafwing butterflies, goatweed butterflies
Anaea is a genus of Neotropical leafwing butterflies in the family Nymphalidae, tribe Anaeini. Species are renowned for their cryptic coloration, with wing undersides that mimic dead leaves. The genus is primarily associated with Croton species (Euphorbiaceae) as larval host plants. Anaea butterflies exhibit seasonal dimorphism and host plant segregation among sympatric species. Several species are of conservation concern, including the federally endangered Anaea troglodyta floridalis in Florida.
Disholcaspis prehensa
clasping twig gall wasp
Disholcaspis prehensa is a gall-inducing cynipid wasp native to California that induces distinctive galls on scrub oak and leather oak. The species exhibits heterogony, alternating between sexual and asexual generations that produce two morphologically different gall types. The asexual generation forms conspicuous mushroom-shaped twig galls with clasping bases, while the sexual generation produces small, hidden bud galls.
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vulnerata
Wounded Leafhopper
Erasmoneura vulnerata is a small leafhopper native to North America that has become an invasive pest in European vineyards since its first detection in Italy in 2004. Adults measure 2.7–3.2 mm in length and exhibit seasonal color dimorphism. The species completes 2–3 generations per year, with nymphal development taking 16–20 days. Feeding on grapevine mesophyll causes characteristic pale speckled lesions, leaf curling, and premature defoliation. In its invaded range, it poses significant economic threat to viticulture, particularly in organic vineyards where natural insecticides show limited efficacy.
Eurytides marcellus
Zebra Swallowtail
Eurytides marcellus, commonly known as the zebra swallowtail, is a striking swallowtail butterfly native to eastern North America. It is immediately recognizable by its distinctive black-and-white longitudinal stripes, triangular wings, and long swordlike tails. The species exhibits strong ecological dependence on pawpaw trees (Asimina spp.), which serve as the exclusive larval host plants. Two seasonal forms occur: spring forms are smaller with shorter tails and more white coloration, while summer forms are larger with broader black stripes and longer tails. The zebra swallowtail is the official state butterfly of Tennessee and has been documented as far north as southern Canada, with recent range expansions facilitated by pawpaw plantings.
Euschistus tristigmus
Dusky Stink Bug
Euschistus tristigmus, commonly known as the dusky stink bug, is a pentatomid species native to North and Central America. It belongs to the economically important genus Euschistus, which includes several brown stink bug species that are agricultural pests. The species exhibits adult seasonal dimorphism, with morphological differences between spring and summer generations. Research has documented its vertical distribution patterns in pecan orchards, where it shows a preference for canopy habitats compared to the ground-dwelling tendencies of its congener Euschistus servus.
Euschistus tristigmus tristigmus
dusky stink bug
Euschistus tristigmus tristigmus is a Nearctic subspecies of brown stink bug in the family Pentatomidae. It is a member of the ictericus species group, characterized by distinctive male genitalia morphology. Adults exhibit seasonal dimorphism and are active from March through November, with nymphs present June through October. The subspecies is associated with pecan orchards and other woody habitats, showing a pronounced preference for upper canopy levels compared to ground-dwelling congeners.
Nemoria arizonaria
emerald moth
Nemoria arizonaria is a North American emerald moth in the family Geometridae, first described by Augustus Radcliffe Grote in 1883. The species exhibits remarkable phenotypic plasticity in its larvae, which develop distinct camouflage morphs depending on diet: catkin-feeding larvae resemble oak catkins, while leaf-feeding larvae mimic twigs. Adults display seasonal dimorphism, with summer and winter/spring forms differing in wing markings; the summer form was formerly described as a separate species, Nemoria aemularia. The moth is restricted to canyon habitats in the southwestern United States at elevations of 4,000–8,000 feet.
Phytoptidae
Phytoptidae is a family of eriophyoid mites in the order Trombidiformes, comprising approximately 75 described species across 17 genera. These microscopic, four-legged mites are obligate phytophages that exhibit diverse life strategies including vagrant surface feeding, gall induction, and endoparasitism beneath plant epidermis. The family is primarily associated with angiosperms, though some lineages inhabit conifers. Notable genera include Phytoptus, Retracrus, Austracus, Novophytoptus, and Oziella. Many species are economically significant as agricultural pests of palms, hazelnuts, and other crops.
Polygonia progne
Gray Comma, Grey Comma
Polygonia progne, the gray comma, is a North American butterfly species in the family Nymphalidae. Adults display seasonal dimorphism: summer forms have bright orange-brown upper wings with dark hindwing borders, while both forms show few yellow marginal spots. The species is notable for its L-shaped silver markings on charcoal gray undersides and its deeply notched wing margins that create an angular silhouette. It produces two generations annually, with the second generation's eggs hatching in October to overwinter as larvae.
Thorybes bathyllus
southern cloudywing
Thorybes bathyllus, commonly known as the southern cloudywing, is a North American skipper butterfly in the family Hesperiidae. It is characterized by erratic, low flight and challenging identification due to individual variation and seasonal forms. The species exhibits distinct spring and summer morphs in southern populations, with spring forms being lightly marked and summer forms more boldly patterned. It has one brood per year in northern regions and two to three broods in the south.
Thyanta calceata
Thyanta calceata is a species of stink bug in the family Pentatomidae, native to North America. The species exhibits adult seasonal dimorphism, a trait documented in entomological literature but with limited publicly available biological detail. Like other members of the genus Thyanta, it is likely associated with herbaceous vegetation and agricultural crops. Published research on its specific ecology remains sparse compared to congeneric species such as Thyanta pallidovirens and Thyanta custator.