The Quino checkerspot (''Euphydryas editha quino'') is a

butterfly Butterflies are insects in the macrolepidopteran clade Rhopalocera from the Order (biology), order Lepidoptera, which also includes moths. Adult butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. The ...

native to southern

California California is a U.S. state, state in the Western United States, located along the West Coast of the United States, Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the List of states and territori ...

and northwestern

Baja California Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...

. It is a

subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...

of the common

Edith's checkerspot Edith's checkerspot (''Euphydryas editha'') is a species of butterfly in the family Nymphalidae. It is a resident species of western North America and among the subspecies, entomologists have long been intrigued by their many phenotypic variation ...

(''Euphydryas editha'') and the second such subspecies to be listed under the federal

Endangered Species Act The Endangered Species Act of 1973 (ESA or "The Act"; 16 U.S.C. § 1531 et seq.) is the primary law in the United States for protecting imperiled species. Designed to protect critically imperiled species from extinction as a "consequence of ec ...

Taxonomy

This

taxon In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...

, like many others, has undergone several changes in nomenclature and classification. It was originally described as ''Melitaea quino'' in 1863 and then in 1929 it was reduced to a subspecies of ''Euphydryas chalcedona''. In 1998 it was concluded through

Hans Hermann Behr Hans Hermann Behr (August 18, 1818, Köthen (Anhalt), Köthen – March 6, 1904, San Francisco) was a German Americans, German-American Physician, doctor, entomologist and botanist. At the time of his death, the ''San Francisco Chronicle'' r ...

's 1863 description that it should be classified as ''E. editha'', not ''E. chalcedona''. Moreover, the subspecies ''E. editha wrighti'' was demoted to a junior

synonym A synonym is a word, morpheme, or phrase that means exactly or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are all ...

for ''E. editha quino''.

Description

Appearance

A member of the brush-footed butterfly family,

Nymphalidae The Nymphalidae are the largest family of butterflies, with more than 6,000 species distributed throughout most of the world. Belonging to the superfamily Papilionoidea, they are usually medium-sized to large butterflies. Most species have a red ...

, the Quino checkerspot is a medium-sized butterfly with a wingspan of approximately 3 cm. The dorsal wing surfaces are a colorful checkerboard of brown, red and yellow spots. The Quino differs from other ''E. editha'' subspecies in that its spots tend to be a darker red. It also differentiates itself through its size and

larva A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The ...

l and

pupa A pupa ( la, pupa, "doll"; plural: ''pupae'') is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their ...

phenotype In genetics, the phenotype () is the set of observable characteristics or traits of an organism. The term covers the organism's morphology or physical form and structure, its developmental processes, its biochemical and physiological proper ...

s. The

ventral Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek language, Greek roots, describe something in its standard anatomical position. Th ...

side of the butterfly are dominated by a checkered red and cream pattern. Its

abdomen The abdomen (colloquially called the belly, tummy, midriff, tucky or stomach) is the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. The abdomen is the front part of the abdominal segment of the torso. ...

has red stripes across the

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage * Dorsal co ...

side. After a second

molt In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer ...

, the Quino checkerspot is recognized by the dark black coloration and row of 8 to 9 orange tubercles on their back. Before the larvae first molt they are mostly yellowish. After first molt and before their second molt they are gray with black markings. The pupae are mottled black on a blue-gray background. The Quino checkerspot is easily confused in the field by inexperienced butterfly searchers. It is generally confused with three other co-occurring butterfly species, the Chalcedon or variable checkerspot (''

Euphydryas chalcedona The variable checkerspot or Chalcedon checkerspot (''Euphydryas chalcedona'') is a butterfly in the family Nymphalidae. It is found in western North America, where its range stretches from Alaska in the north to Baja California in the south and e ...

''), Gabb's checkerspot ('' Chlosyne gabbii'') and Wright's checkerspot ('' Thessalia leonira wrighti'').

Life cycle

The life cycle of the Quino checkerspot closely mirrors that of the close

Bay checkerspot The Bay checkerspot (''Euphydryas editha bayensis'') is a butterfly endemism, endemic to the San Francisco Bay region of the U.S. state of California. It is a federally threatened species, as a subspecies of ''Euphydryas editha''. Since the 1980 ...

. They share the same host plant and similar chronology of developmental stages. Sometimes, organisms

seven times before reaching adulthood. There are typically only one generation of adults every year. The flight period is between February through May.

Habitat

The obvious factor in the decline of the Quino checkerspot is

urban development Urban means "related to a city". In that sense, the term may refer to: * Urban area, geographical area distinct from rural areas * Urban culture, the culture of towns and cities Urban may also refer to: General * Urban (name), a list of people ...

. Much of the historic scrub land that it occupied, much like the

Mission blue butterfly The Mission blue (''Icaricia icarioides missionensis'') is a blue or lycaenid butterfly subspecies native to the San Francisco Bay Area of the United States. The butterfly has been declared as endangered by the US federal government. It is a su ...

, also endangered, has been built over. The persisting

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

faces other threats.

Invasive species An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...

, in the form of non-native plant life and

overgrazing Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature res ...

are just two of the hurdles facing the recovery of the Quino checkerspot. Today, there are eight populations of the Quino known.
Essig Museum of Entomology, UC Berkeley.

Range

Habitat declined and, thus, distribution and population of the Quino checkerspot has been greatly reduced during the last 100 years, likely around 75%. Nearly all of the blame lies in

agricultural Agriculture or farming is the practice of cultivating Plant, plants and livestock. Agriculture was the key development in the rise of Sedentism, sedentary human civilization, whereby farming of Domestication, domesticated species created food ...

and urban development in southern California. The other impactors to the decline include non-native grasses and fire suppression practices as well as

grazing In agriculture, grazing is a method of animal husbandry whereby domestic livestock are allowed outdoors to roam around and consume wild vegetations in order to convert the otherwise indigestible (by human gut) cellulose within grass and other ...

. The Quino checkerspot became the second subspecies of ''Euphydryas editha'' to be listed under the Endangered Species Act (ESA). The first was the

. Currently, the Quino checkerspot is only found in a very few locales. Western

Riverside County Riverside County is a county located in the southern portion of the U.S. state of California. As of the 2020 census, the population was 2,418,185, making it the fourth-most populous county in California and the 10th-most populous in the Unit ...

, southern

San Diego County San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the fi ...

and northern

, Mexico. The animal's historic range once included much of coastal California south of

Ventura County Ventura County () is a county in the southern part of the U.S. state of California. As of the 2020 census, the population was 843,843. The largest city is Oxnard, and the county seat is the city of Ventura. Ventura County comprises the Oxnar ...

as well as the inland valleys south of the

Tehachapi Mountains The Tehachapi Mountains (; Kawaiisu: ''Tihachipia'', meaning "hard climb") are a mountain range in the Transverse Ranges system of California in the Western United States. The range extends for approximately in southern Kern County and northwest ...

. Regardless, more than 75% of the butterfly's original range has been lost. The range loss translates directly into population decline. Quino checkerspot butterfly populations appear to have decreased by more than 95% range wide.

Impact of barrier construction along Mexico-United States border

American President

Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who served as the 45th president of the United States from 2017 to 2021. Trump graduated from the Wharton School of the University of Pe ...

proposed expansion of the border wall between Mexico and the US to prevent illegal entry by foreign nationals through Mexico into the US during his

presidential campaign President most commonly refers to: *President (corporate title) *President (education), a leader of a college or university *President (government title) President may also refer to: Automobiles * Nissan President, a 1966–2010 Japanese ful ...

and upon being elected. The construction of additional border walls in new locations would likely have adverse effects on many species, including the Quino checkerspot. Because the range of the subspecies is so reduced and threatened already, the construction of a wall would separate the organisms in Mexico and the US, which would reduce the

genetic diversity Genetic diversity is the total number of genetic characteristics in the genetic makeup of a species, it ranges widely from the number of species to differences within species and can be attributed to the span of survival for a species. It is dis ...

between the populations. In addition, the proposed wall could harm the

native vegetation In biogeography, a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only local natural evolution (though often popularised as "with no human intervention") during history. The term is equi ...

the butterflies need and may spread

invasive species An invasive species otherwise known as an alien is an introduced organism that becomes overpopulated and harms its new environment. Although most introduced species are neutral or beneficial with respect to other species, invasive species ad ...

in areas disturbed by the construction.

References

{{Taxonbar, from=Q7272322 Euphydryas Fauna of California Fauna of the Baja California Peninsula Fauna of the California chaparral and woodlands Natural history of Baja California Natural history of the Peninsular Ranges Natural history of the Transverse Ranges Butterflies of North America Endangered fauna of California Endangered biota of Mexico Endangered fauna of North America ESA endangered species Butterfly subspecies