Firefly

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Firefly
Temporal range: Cenomanian-Recent
Photuris lucicrescens.jpg
Photuris lucicrescens [1]
Lampyris Noctiluca (firefly) mating.gif
Lampyris noctiluca mating
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Infraorder: Elateriformia
Superfamily: Elateroidea
Family: Lampyridae
Rafinesque, 1815
Subfamilies

Amydetinae [2]
Cheguevariinae [3]
Chespiritoinae [4]
Cyphonocerinae
Lamprohizinae [2]
Lampyrinae
Luciolinae
Ototretinae
Photurinae
Psilocladinae [2]
Pterotinae [2]

Contents

Genera incertae sedis : [2]
Anadrilus Kirsch, 1875
Araucariocladus Silveira and Mermudes, 2017
Crassitarsus Martin, 2019
Lamprigera Motschulsky, 1853
Oculogryphus
Jeng, Engel, and Yang, 2007
Photoctus McDermott, 1961
Pollaclasis Newman, 1838

The Lampyridae are a family of elateroid beetles with more than 2,000 described species, many of which are light-emitting. They are soft-bodied beetles commonly called fireflies, lightning bugs, or glowworms for their conspicuous production of light, mainly during twilight, to attract mates. Light production in the Lampyridae is thought to have originated as an honest warning signal that the larvae were distasteful; this was co-opted as a mating signal in the adults. In a further development, female fireflies of the genus Photuris mimic the flash pattern of Photinus species to trap their males as prey.

Fireflies are found in temperate and tropical climates. Many live in marshes or in wet, wooded areas where their larvae have abundant sources of food. While all known fireflies glow as larvae, only some species produce light in their adult stage, and the location of the light organ varies among species and between sexes of the same species. Fireflies have attracted human attention since classical antiquity; their presence has been taken to signify a wide variety of conditions in different cultures and is especially appreciated aesthetically in Japan, where parks are set aside for this specific purpose.

Biology

A larviform female with light-emitting organs on her abdomen. Unlike actual larvae, she has compound eyes. Luciola4 crop.png
A larviform female with light-emitting organs on her abdomen. Unlike actual larvae, she has compound eyes.

Fireflies are beetles and in many aspects resemble other beetles at all stages of their life cycle, undergoing complete metamorphosis. [5] A few days after mating, a female lays her fertilized eggs on or just below the surface of the ground. The eggs hatch three to four weeks later. [6] In certain firefly species with aquatic larvae, such as Aquatica leii , the female oviposits on emergent portions of aquatic plants, and the larvae descend into the water after hatching. [7]

The larvae feed until the end of the summer. Most fireflies hibernate as larvae. Some do this by burrowing underground, while others find places on or under the bark of trees. They emerge in the spring. At least one species, Ellychnia corrusca , overwinters as an adult. [8] The larvae of most species are specialized predators and feed on other larvae, terrestrial snails, and slugs. Some are so specialized that they have grooved mandibles that deliver digestive fluids directly to their prey. The larval stage lasts from several weeks up to, in certain species, two or more years. [9] The larvae pupate for one to two and a half weeks and emerge as adults. [6]

Adult diet varies among firefly species: some are predatory, while others feed on plant pollen or nectar. Some adults, like the European glow-worm, have no mouth, emerging only to mate and lay eggs before dying. In most species, adults live for a few weeks in summer. [6] [10]

Fireflies vary widely in their general appearance, with differences in color, shape, size, and features such as antennae. Adults differ in size depending on the species, with the largest up to 25 mm (1 in) long. Many species have non-flying larviform females. These can often be distinguished from the larvae only because the adult females have compound eyes, unlike the simple eyes of larvae, though the females have much smaller (and often highly regressed) eyes than those of their males. [11] The most commonly known fireflies are nocturnal, although numerous species are diurnal and usually not luminescent; however, some species that remain in shadowy areas may produce light. [5]

Most fireflies are distasteful to vertebrate predators, as they contain the steroid pyrones lucibufagins, similar to the cardiotonic bufadienolides found in some poisonous toads. [12] All fireflies glow as larvae, where bioluminescence is an honest aposematic warning signal to predators. [13] [14] [15]

Light and chemical production

Photuris female by flash photography (above); by her own light (below) Firefly composite.jpg
Photuris female by flash photography (above); by her own light (below)

Light production in fireflies is due to the chemical process of bioluminescence. This occurs in specialized light-emitting organs, usually on a female firefly's lower abdomen. The enzyme luciferase acts on luciferin, in the presence of magnesium ions, ATP, and oxygen to produce light. Oxygen is supplied via an abdominal trachea or breathing tube. Gene coding for these substances has been inserted into many different organisms. [16] Firefly luciferase is used in forensics, and the enzyme has medical uses – in particular, for detecting the presence of ATP or magnesium. [13] Fireflies produce a "cold light", with no infrared or ultraviolet frequencies. The light may be yellow, green, or pale red, with wavelengths from 510 to 670 nanometers. Some species such as the dimly glowing "blue ghost" of the Eastern US may seem to emit blueish-white light from a distance and in low light conditions, but their glow is bright green when observed up close. [17] Their perceived blue tint may be due to the Purkinje effect. [18] During a study on the genome of Aquatica leii , scientists discovered two key genes are responsible for the formation, activation, and positioning of this firefly's light organ: Alabd-B and AlUnc-4. [19]

Adults emit light primarily for mate selection. Early larval bioluminescence was adopted in the phylogeny of adult fireflies, and was repeatedly gained and lost before becoming fixed and retained as a mechanism of sexual communication in many species. [13] [20] Adult lampyrids have a variety of ways to communicate with mates in courtships: steady glows, flashing, and the use of chemical signals unrelated to photic systems. [21] Chemical signals, or pheromones, are the ancestral form of sexual communication; this pre-dates the evolution of flash signaling in the lineage, and is retained today in diurnally-active species. [13] [22] Some species, especially lightning bugs of the genera Photinus , Photuris , and Pyractomena , are distinguished by the unique courtship flash patterns emitted by flying males in search of females. In general, females of the genus Photinus do not fly, but do give a flash response to males of their own species. Signals, whether photic or chemical, allow fireflies to identify mates of their own species. Flash signaling characteristics include differences in duration, timing, color, number and rate of repetitions, height of flight, and direction of flight (e.g. climbing or diving) and vary interspecifically and geographically. [23] [15] When flash signals are not sufficiently distinguished between species in a population, sexual selection encourages divergence of signaling patterns. [23]

Synchronization of flashing occurs in several species; it is explained as phase synchronization and spontaneous order. [24] Tropical fireflies routinely synchronise their flashes among large groups, particularly in Southeast Asia. At night along river banks in the Malaysian jungles, fireflies synchronize their light emissions precisely. Current hypotheses about the causes of this behavior involve diet, social interaction, and altitude. In the Philippines, thousands of fireflies can be seen all year-round in the town of Donsol. In the United States, one of the most famous sightings of fireflies blinking in unison occurs annually near Elkmont, Tennessee, in the Great Smoky Mountains during the first weeks of June. [25] Congaree National Park in South Carolina is another host to this phenomenon. [26]

Female "femme fatale" Photuris fireflies mimic the photic signaling patterns of the smaller Photinus, attracting males to what appears to be a suitable mate, then eating them. [13] This provides the females with a supply of the toxic defensive lucibufagin chemicals. [27]

Many fireflies do not produce light. Usually these species are diurnal, or day-flying, such as those in the genus Ellychnia . A few diurnal fireflies that inhabit primarily shadowy places, such as beneath tall plants or trees, are luminescent. One such genus is Lucidota .

Non-bioluminescent fireflies use pheromones to signal mates. Some basal groups do not show bioluminescence and use chemical signaling, instead. Phosphaenus hemipterus has photic organs, yet is a diurnal firefly and displays large antennae and small eyes. These traits strongly suggest pheromones are used for sexual selection, while photic organs are used for warning signals. In controlled experiments, males coming from downwind arrived at females first, indicating that males travel upwind along a pheromone plume. Males can find females without the use of visual cues, so sexual communication in P. hemipterus appears to be mediated entirely by pheromones. [28]

Evolution

Fossil history

The oldest known fossil of the Lampyridae family is Protoluciola from the Late Cretaceous (Cenomanian ~ 99 million years ago) Burmese amber of Myanmar, which belongs to the subfamily Luciolinae. The light producing organ is clearly present. [29] The ancestral glow colour for the last common ancestor of all living fireflies has been inferred to be green, based on genomic analysis. [30]

Taxonomy

The fireflies (including the lightning bugs) are a family, Lampyridae, of some 2,000 species within the Coleoptera. The family forms a single clade, a natural phylogenetic group. [2] The term glowworm is used for both adults and larvae of firefly species such as Lampyris noctiluca , the common European glowworm, in which only the nonflying adult females glow brightly; the flying males glow weakly and intermittently. [31] [32] [33] In the Americas, "glow worms" are the closely related Coleopteran family Phengodidae, while in New Zealand and Australia, a "glow worm" is a luminescent larva of the fungus gnat Arachnocampa , within the true flies, Diptera. [31]

Phylogeny

The phylogeny of the Lampyridae family, based on both phylogenetic and morphological evidence by Martin et al. 2019, is: [2]

Coleoptera
Cantharidae, etc.

Cantharis lateralis 85974126.jpg

Elateriformia

Elateridae Ampedus nigricollis.jpg

Rhagophthalmidae

Phengodidae Phengodes orbignyi.jpg

Lampyridae

Luciolinae Luciola lusitanica .jpg

Pterotinae Firefly - Pterotus obscuripennis, Sierra City, California (cropped).jpg

Ototretinae Oculogryphus chenghoiyanae (cropped).jpg

Lamprohizinae Lamprohiza splendidula01 (cropped).jpg

Psilocladinae

Amydetinae

Photurinae Photuris lucicrescens (cropped).jpg

Lampyrinae Lamprigera yunnana (cropped).jpg

bioluminescent

Interaction with humans

Conservation

Fireflies in Georgia, 8-second exposure Fireflies, Georgia, US.jpg
Fireflies in Georgia, 8-second exposure

Firefly populations are thought to be declining worldwide. While monitoring data for many regions are scarce, a growing number of anecdotal reports, coupled with several published studies from Europe and Asia, suggest that fireflies are in trouble. [34] [35] [36] [37] Recent IUCN Red List assessments for North American fireflies have identified species with heightened extinction risk in the US, with 18 taxa categorized as threatened with extinction. [38] [39]

Fireflies face threats including habitat loss and degradation, light pollution, pesticide use, poor water quality, invasive species, over-collection, and climate change. [40] Firefly tourism, a quickly growing sector of the travel and tourism industry, has also been identified as a potential threat to fireflies and their habitats when not managed appropriately. [41] Like many other organisms, fireflies are directly affected by land-use change (e.g., loss of habitat area and connectivity), which is identified as the main driver of biodiversity changes in terrestrial ecosystems. [42] Pesticides, including insecticides and herbicides, have also been indicated as a likely cause of firefly decline. [43] [44] These chemicals can not only harm fireflies directly but also potentially reduce prey populations and degrade habitat. Light pollution is an especially concerning threat to fireflies. Since the majority of firefly species use bioluminescent courtship signals, [45] they are also very sensitive to environmental levels of light and consequently to light pollution. [45] [46] A growing number of studies investigating the effects of artificial light at night on fireflies has shown that light pollution can disrupt fireflies' courtship signals and even interfere with larval dispersal. [47] [48] [49] [50] Researchers agree that protecting and enhancing firefly habitat is necessary to conserve their populations. Recommendations include reducing or limiting artificial light at night, restoring habitats where threatened species occur, and eliminating unnecessary pesticide use, among many others. [44] [51] [52]

Sundarbans Firefly Sanctuary in Bangladesh was established in 2019.

In culture

Shoen Uemura - Firefly.jpg
Uemura Shōen's 1913 firefly, a sign of summer in Japan
Hotarugari Mizuno Toshikata.jpg
Hotarugari, Firefly Catching, by Mizuno Toshikata, 1891

Fireflies have featured in human culture around the world for centuries. [53] In Japan, the emergence of fireflies (Japanese: hotaru) signifies the anticipated changing of the seasons; [54] firefly viewing is a special aesthetic pleasure of midsummer, celebrated in parks that exist for that one purpose. [55] The Japanese sword called Hotarumaru, made in the 14th century, is so named for a legend that one night its flaws were repaired by fireflies. [56] [57]

In Italy, the firefly (Italian: lucciola) appears in Canto XXVI of Dante's Inferno, written in the 14th century: [58]

Quante ’l villan ch’al poggio si riposa,
nel tempo che colui che ’l mondo schiara
la faccia sua a noi tien meno ascosa,

come la mosca cede a la zanzara,
vede lucciole giù per la vallea,
forse colà dov’ e’ vendemmia e ara:

di tante fiamme tutta risplendea
l’ottava bolgia, ...

— Dante's Inferno, Canto XXVI, lines 25–32

As many as the fireflies which the peasant sees in the [Tuscan] valley below, when he is resting on the hill—in the season [midsummer] when the sun hides least from us, and at the time of day [dusk] when the fly gives place to the mosquito—perhaps in the fields where he tills the ground and gathers in the grapes; with that many flames the eighth ditch [of Hell] was shining, ...

— prose translation

Related Research Articles

<span class="mw-page-title-main">Bioluminescence</span> Emission of light by a living organism

Bioluminescence is the production and emission of light by living organisms. It is a form of chemiluminescence. Bioluminescence occurs widely in marine vertebrates and invertebrates, as well as in some fungi, microorganisms including some bioluminescent bacteria, and terrestrial arthropods such as fireflies. In some animals, the light is bacteriogenic, produced by symbiotic bacteria such as those from the genus Vibrio; in others, it is autogenic, produced by the animals themselves.

<i>Photuris</i> Genus of beetles

Photuris is a genus of fireflies. These are the femme fatale lightning bugs of North America. This common name refers to a behavior of the adult females of these predatory beetles; they engage in aggressive mimicry, imitating the light signals of other firefly species' females to attract mates – but Photuris use it to attract, kill and eat the unsuspecting males of those other species. Their flashing bioluminescent signals seem to have evolved independently and eventually adapted to those of their prey, mainly unrelated Lampyrinae, such as Photinus or Pyractomena.

Glowworm or glow-worm is the common name for various groups of insect larvae and adult larviform females that glow through bioluminescence. They include the European common glow-worm and other members of the Lampyridae, but bioluminescence also occurs in the families Elateridae, Phengodidae and Rhagophthalmidae among beetles; as well as members of the genera Arachnocampa, Keroplatus and Orfelia among keroplatid fungus gnats.

<span class="mw-page-title-main">Rhagophthalmidae</span> Family of beetles

The Rhagophthalmidae are a family of beetles within the superfamily Elateroidea. Members of this beetle family have bioluminescent organs on the larvae, and sometimes adults, and are closely related to the Phengodidae, though historically they have been often treated as a subfamily of Lampyridae, or as related to that family. Some recent evidence suggested that they were the sister group to the Phengodidae, and somewhat distantly related to Lampyridae, whose sister taxon was Cantharidae, but more reliable genome-based phylogenetics placed as the sister group to the Lampyridae.

<i>Lampyris noctiluca</i> Species of beetle

Lampyris noctiluca, the common glow-worm of Europe, is the type species of beetle in the genus Lampyris and the family Lampyridae.

<span class="mw-page-title-main">Ototretinae</span> Subfamily of beetles

The Ototretinae are a small subfamily in the firefly family (Lampyridae). They are close to the Luciolinae in some respects, but do not glow or flash. Rather, they attract their partners with pheromones like many relatives of the firefly family. They are found in Eurasia and North America.

<span class="mw-page-title-main">Photurinae</span> Subfamily of beetles

The Photurinae are a subfamily of fireflies (Lampyridae). They contain many of the well-known North American species, such as the Pennsylvania firefly, state insect of Pennsylvania. They are among the "flashing" fireflies known as "lightning bugs" in North America, although they are not too distantly related to the flashing fireflies in the Lampyrinae; as the most basal lineages of that subfamily do not produce light at all, the Photurinae's flashing signals seem to be convergent evolution.

<span class="mw-page-title-main">Lampyrinae</span> Subfamily of beetles

The Lampyrinae are a large subfamily of fireflies (Lampyridae). The exact delimitation, and the internal systematics, have until recently been a matter of debate; for long this group was used as a "wastebin taxon" to hold any fireflies with insufficiently resolved relationships. Regardless, they are very diverse even as a good monophyletic group, containing flashing and continuous-glow fireflies from the Holarctic and some tropical forms as well. The ancestral Lampyrinae probably had no or very primitive light signals; in any case several modern lineages appear to have returned to the pheromone communication of their ancestors independently.

<i>Photuris pensylvanica</i> Species of beetle

Photuris pensylvanica, known by the common names Pennsylvania firefly, lightning bug, dot-dash firefly and glowworm, is a species of firefly from the United States and Canada. It is also widely known under the Latin name Photuris pennsylvanica, although the original spelling, with one "n", was common in Latinized names of the time and remains the valid name.

<i>Photinus pyralis</i> Species of beetle

Photinus pyralis, better known by the common name, the common eastern firefly, and colloquially called a "lightning bug", is a species of flying beetle. An organ on this species abdomen is responsible for its light production. It is the most common species of firefly in North America, and is typically found east of the Rocky Mountains. Photinus fireflies are often confused with fireflies of the similar-sounding genus, Photuris, which are also found in North America.

<i>Photinus</i> (beetle) Genus of beetles

The rover fireflies (Photinus) are a genus of fireflies. They are the type genus of tribe Photinini in subfamily Lampyrinae. This genus contains, for example, the common eastern firefly, the most common species of firefly in North America.

<i>Photinus carolinus</i> Species of beetle

Photinus carolinus is a species of rover firefly whose mating displays of synchronous flashing have fascinated both scientists and tourists. As individual females synchronize with males nearby, waves of alternating bright light and darkness seem to travel across the landscape. Firefly displays typically occur in early June near Elkmont, Tennessee, in the Great Smoky Mountains National Park, near Gatlinburg.

Photuris versicolor, is a species complex of firefly common throughout the Eastern United States. Fireflies famously use flash-based visual signalling to find mates at a distance and each species of firefly has a unique flash pattern sequence that males and females of the same species use to identify one another. Researchers have documented the ability of female P. versicolor to hunt males of other firefly species by mimicking the flash responses of female fireflies of other species. Photuris versicolor appear to target males, such as Photinus pyralis, specifically for the lucibufagin steroids that their prey produce.

<i>Aquatica lateralis</i> Species of insect of the genus Luciola

Aquatica lateralis, known as "heike-botaru" (ヘイケボタル) in Japanese, is a species of firefly found in Russia, Japan and Korea. It was formerly placed in the genus Luciola. The larvae are aquatic and live in rice paddies.

Photinus consanguineus, or Double Cousin Firefly, is a species of firefly in the genus Photinus. It is found in eastern North America.


Photinus macdermotti, or Father Mac's firefly or Mr. Mac, is a species of firefly in the family Lampyridae. It is found in North America.

<i>Lucidota atra</i> Species of beetle

Lucidota atra, the black firefly or woodland lucy, is a diurnal species of firefly — a member of the Lampyridae family of beetles.

Photinus consimilis, or cattail flash-train firefly, is a species of firefly in the beetle family Lampyridae. It is found in eastern North America.


Photinus indictus, or silent firefly, is a species of firefly in the beetle family Lampyridae. It is a diurnal firefly, active during the day rather than at night, with no lanterns. It is found in eastern North America.

Sara Margery Lewis is an American biologist, professor, author, and firefly expert.

References

  1. ↑ Cirrus Digit Firefly Photuris lucicrescens
  2. 1 2 3 4 5 6 7 Martin, Gavin J.; Stanger-Hall, Kathrin F.; Branham, Marc A.; et al. (1 November 2019). Jordal, Bjarte (ed.). "Higher-Level Phylogeny and Reclassification of Lampyridae (Coleoptera: Elateroidea)". Insect Systematics and Diversity . 3 (6). Oxford University Press ). doi:10.1093/isd/ixz024.
  3. ↑ Ferreira, Vinicius S.; Keller, Oliver; Branham, Marc A.; Ivie, Michael A. (2019). "Molecular data support the placement of the enigmatic Cheguevaria as a subfamily of Lampyridae (Insecta: Coleoptera)". Zoological Journal of the Linnean Society . 187 (4). Oxford University Press: 1253–1258. doi: 10.1093/zoolinnean/zlz073 .
  4. ↑ Ferreira, Vinicius S.; Keller, Oliver; Branham, Marc A (1 November 2020). Marvaldi, Adriana (ed.). "Multilocus Phylogeny Support the Nonbioluminescent Firefly Chespirito as a New Subfamily in the Lampyridae (Coleoptera: Elateroidea)". Insect Systematics and Diversity . 4 (6). Oxford University Press. doi:10.1093/isd/ixaa014.
  5. 1 2 Lewis, Sara (26 April 2016). Silent Sparks: The Wondrous World of Fireflies. Princeton University Press. p. 17. ISBN   978-1400880317.
  6. 1 2 3 Marshall, Michael (22 February 2020). "Why the lights are going out for fireflies". The Guardian . Retrieved 4 February 2022.
  7. ↑ Fu, Xinhua; Nobuyoshi, Ohba; Vencl, Fredric V.; Lei, Chaoliang (2006). "Life cycle and behaviour of the aquatic firefly Luciola leii (Coleoptera: Lampyridae) from Mainland China". The Canadian Entomologist. 138 (6): 860–870. doi:10.4039/n05-093. S2CID   84624340.
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  11. ↑ Lau, T. F.; Meyer-Rochow, V. B. (2006). "Sexual dimorphism in the compound eye of Rhagophthalmus ohbai (Coleoptera: Rhagophthalmidae): Morphology and ultrastructure". Journal of Asia-Pacific Entomology. 9: 19–30. doi:10.1016/S1226-8615(08)60271-X.
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  14. ↑ Branham, Marc A.; Wenzel, John W. (December 2001). "The Evolution of Bioluminescence in Cantharoids (Coleoptera: Elateroidea)". The Florida Entomologist . 84 (4): 565. doi: 10.2307/3496389 . JSTOR   3496389.
  15. 1 2 Gullan & Cranston 2014, pp. 121–122.
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  17. ↑ Frick-Ruppert, Jennifer E.; Rosen, Joshua J. (2008). "Morphology and Behavior of Phausis Reticulata (Blue Ghost Firefly)". Journal of the North Carolina Academy of Science. 124 (4): 139–147.
  18. ↑ Branchini, Bruce R.; Southworth, Tara L.; Salituro, Leah J.; Fontaine, Danielle M.; Oba, Yuichi (2017). "Cloning of the Blue Ghost (Phausis reticulata) Luciferase Reveals a Glowing Source of Green Light". Photochemistry and Photobiology . 93 (2): 473–478. doi: 10.1111/php.12649 . PMID   27696431.
  19. ↑ Fu, Xinhua; Zhu, Xinlei (5 March 2024). "Key homeobox transcription factors regulate the development of the firefly's adult light organ and bioluminescence". Nature Communications. 15 (1): 1736. doi:10.1038/s41467-024-45559-7. ISSN   2041-1723.
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  21. ↑ Stanger-Hall, K. F.; Lloyd, J. E.; Hillis, D. M. (2007). "Phylogeny of North American fireflies (Coleoptera: Lampyridae): implications for the evolution of light signals". Molecular Phylogenetics and Evolution . 45 (1): 33–49. doi:10.1016/j.ympev.2007.05.013. PMID   17644427.
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  24. ↑ Murray, James D. (2002). Mathematical Biology. Vol. I. An Introduction (3rd ed.). Springer. pp. 295–299. ISBN   978-0-387-95223-9.
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  26. ↑ Cross, Robert (23 May 2004) "Tree huggin'". Chicago Tribune.
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  29. ↑ Kazantsev, S. V. (December 2015). "Protoluciola albertalleni gen.n., sp.n., a new Luciolinae firefly (Insecta: Coleoptera: Lampyridae) from Burmite amber". Russian Entomological Journal. 24 (1): 281–283. doi: 10.15298/rusentj.24.4.02 .
  30. ↑ Oba, Y.; Konishi, K.; Yano, D.; Shibata, H.; Kato, D.; Shirai, T. (December 2020). "Resurrecting the ancient glow of the fireflies". Science Advances . 6 (49): eabc5705. Bibcode:2020SciA....6.5705O. doi:10.1126/sciadv.abc5705. PMC   7710365 . PMID   33268373.
  31. 1 2 Meyer-Rochow, Victor Benno (2007). "Glowworms: a review of "Arachnocampa" spp and kin". Luminescence . 22 (3): 251–265. doi:10.1002/bio.955. PMID   17285566.
  32. ↑ "UK Glow worm survey home page".
  33. ↑ "Enter a glow-worm record". 11 June 2015. Retrieved 19 July 2018.
  34. ↑ Atkins, Val; Bell, Dolly; Bowker, Ann; et al. (2016). "The status of the glow-worm Lampyris noctiluca L. (Coleoptera: Lampyridae) in England". Lampyrid. 4: 20–35.
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