Agriotes Eschscholtz, 1829, Dalopius Eschscholtz, 1829 and Melanotus Eschscholtz, 1829 it is pointed whereas in e.g. The group is represented in the U.K. by 3 species of Melanotus although M. castanipes (Paykull, 1800) has only recently been separated from M. villous (Geoffroy in Fourcroy, 1785). The U.K. fauna is relatively small with 7 species included in 4 genera. M. punctolineatus (Pelerin, 1829) is a very local species of southeast England, developing at the roots of grasses etc. Most species occur in tropical Africa; about 120 species in 5 genera are Nearctic while 7 genera are Palaearctic of which 3 occur in central Europe. The lateral margins are usually simple, without teeth or serrations etc. Hercules Beetles, Genus Dynastes. Wireworm can live up to 4 years in the soil before pupation and finally emerging as adult click beetles. Punctation is random; the size and spacing varies and a mixture of sizes may be present. Most occur in woodland environments with larvae developing in decaying wood or under bark etc. Morostomatinae In the widest sense this subfamily includes 10 tribes but it is often considered to consist of only the following tribe. They are about 25mm long with shiny, yellow-orange bodies. All elaterids can perform this click as can some eucnemids but here it is much less powerful and any jumping produced tends to be feeble by comparison. How to Prevent Them Dorsal pubescence tends to be fine and regular and many are strikingly coloured although with a few exceptions the U.K. fauna is rather drab in this respect. and a four year cycle is not uncommon. They locate plants by following carbon dioxide gradients in the soil, their cylindrical shape allowing them to move quickly and they readily utilize pre-existing burrows to move between plants. L. corpulentus Candéze, 1889, the one-eyed Madagascan click beetle or L. goudti (Laporte de Castelnau, 1836). The monotypic Palaearctic Synaptus Eschscholtz, 1829 occurs locally in southern England and Wales in wetland marginal environments. The majority of species develop over two years and in general they are considered beneficial as many feed on plant pests e.g. In the narrow ‘modern’ sense the subfamily includes 9 tribes and more than 1000 species. They are a cosmopolitan beetle family characterized by the unusual click mechanism they possess. The biology of the group is typical of the family with many saproxylic and subterranean developing species. Throughout UK and Europe. Their ranges may overlap at the boundaries, but it is unlikely to see species completely cross over and populate the others' regions. The figeater beetle (Cotinis mutabilis) is a green-colored beetle that is commonly found in yards, compost heaps, and mulch.Belonging to the beetle family Scarabaeidae, “fig” beetles have a semi-glossy green shell with orange-colored edges.Turning the beetles over, you will notice striking metallic green belly and legs.  The ninth segment, the rearmost, is pointed in larvae of Agriotes, Dalopius and Melanotus, but is bifid due to a so-called caudal notch in Selatosomus (formerly Ctenicera), Limonius, Hypnoides and Athous species. Elater Linnaeus, 1758. are metallic green or blue. All are intensely interesting; some Balgus species are bioluminescent, emitting light from the thorax while some Cossolenis superficially resemble huge scolytids and some Balgus have very developed tubercles to the pronotum and elytra. Click Beetle, common name for any adult beetle of the click beetle family, also known as snapping beetle, skipjack, and spring beetle. It contains four Nearctic and more than 30 Palaearctic species. Some species are long-lived and overwinter under bark etc. The abdomen has 5 ventrites, the first four being fused. The pronotum is wrinkled along the base and has distinct ridges above the produced hind angles; the Prosternal process is narrowed apically and inclined towards the body posterior to the coxae. In arboriculture the larvae of Ectinus aterrimus (Linnaeus, 1761) develop in beech seeds and acorns in central Europe and outbreaks of adults are controlled with pheromone traps. Pityobiinae Semiotus Eschscholtz, 1829 contains more than 80 species and is distinguished by the presence of anteriolateral spines on the pronotum; these may be only weakly defined or the margin may be simply sinuate. and they infest a wide range of crops including potato and beet tubers, corn, wheat, maize and strawberry as well as rapidly growing crops like lettuce and spinach. On the other hand the Pyrophorini Candéze, 1863 is sometimes included as a tribe of the Agrypninae. Click beetle larvae . Other names include elaters, snapping beetles, spring beetles or skipjacks. It Includes 20 species in 8 genera, distributed through Australasia and the New World. The Pyrophorini Candéze includes about 20 genera distributed throughout the Neotropical and the southern Nearctic regions, all of which are bioluminescent. Many species are localized to areas of sandy soils or ancient woodland and so are rare or threatened although only one, Cardiophorus gramineus Scopoli, 1763 is protected in Europe. The majority of temperate species are below 20mm while the longest U.K. species is Stenagostus rhombeus (Olivier, 1790) at 21mm. The click beetle is the only beetle that makes a distinctive clicking sound. Weevil Hypera pollux. The aedeagus is trilobed; the parameres often with apical hooks. In the UK DEFRA (2010) have recorded click beetle populations as high as 2.5 x 10 6 per hectare, and 3.8 x 10 6 per hectare on permanent pasture. The Prosternal process is long and narrow, and the Prosternal sutures arcuate. From the Hypnoidinae they are distinguished by the mesepisternum bordering, or very nearly bordering, the coxal cavity; in the Hypnoidinae they are well separated. This small group includes 5 species of Subprotelater Fleutiaux, 1920 distributed in Northern Australia and various islands north to Japan. The colouration is generally drab; black to pale brown and sometimes with various red to yellow markings and some are metallic, in tropical regions there are many vividly coloured and beautiful species and some are bioluminescent with pale markings to the pronotum or the elytra indicating the source of the light. The notosternal sutures are complete, well-impressed or grooved and form lateral antennal cavities. Limoniscus Reitter, 1905 includes 5 Palaearctic species of which 2 occur in Europe and one is listed as British, The Violet Click Beetle. Two occur in the U.K. Calambus Thomson, C.G., 1859 includes a single widespread Palaearctic species. The species are saproxylic with predatory larvae living among decaying wood etc. These very large beetles are in the genus Dynastes, which is found throughout the Americas.Tropical species are among the largest insects in the world. The legs are 5-segmented including a claw-like pretarsus. Many feed on the roots of various plants including grasses, and some damage crops e.g. The adult click beetle, called Athous haemorrhoidalis, below to the left apparently has to do without an English common name. 7-spot ladybird. Included are 15 species of Hemiops Castelnau, 1833, 6 species of Parhemiops Candéze, 1878 and 3 species of Plectrosternum Lacordaire, 1857. Brachygonus du Bysson, 1912 includes 5 Palaearctic species of which one, B. ruficeps (Mulsant & Guillebeau, 1855) has been recorded from a single Berkshire locality. Following recent research this subfamily now includes the very atypical elaterid group Drilini Blanchard, 1845, which inludes the British Drilus flavescens (Fourcroy, 1785). Adults of Melanotus are often large and drab, black to brown and distinctly pubescent. Synaptidae, Elateridae or click beetles (or "typical click beetles" to distinguish them from the related families Cerophytidae and Eucnemidae) are family of beetles. The genus Denticollis Piller & Mitterpacher, 1783 is sometimes considered to be the only genus of this tribe. From some of the examples given below it will be obvious that the family is in a state of flux and that modern molecular techniques are changing the already somewhat fluid state of the classification, both within the family and with regard to other closely related families, and that any system of subfamilies etc, is only going to be temporary. This family was defined by William Elford Leach (1790–1836) in 1815.  The dorsum of the ninth abdominal segment may also have sharp processes, such as in the Oestodini, including the genera Drapetes and Oestodes. On the other hand the Pyrophorini Candéze, 1863 is sometimes included as a tribe of the Agrypninae. Includes about 400 species in 2 tribes and more than 25 genera and there are many more waiting to be described, especially from tropical and sub-tropical areas. Elaterid larvae are phytophagous or predaceous, or a mixture of both, and live in decaying wood, leaf-litter, insect nests and among roots underground. The Palaearctic and Oriental Procraerus Reitter, 1905 includes 15 species, 2 of which occur in Europe and one, P. tibialis (Boisduval & Lacordaire, 1835) is a rare saproxylic species of southern England. carry and spread bacterial and viral diseases between plants. Adult click beetles are black, brown, or grey and about 12 to 40 mm long. Damage caused by the cockroach: Cockroaches, of any stage, can carry and spread bacteria to you and your family. On the University of Florida / Institute of Food and Agricultural Sciences Featured Creatures website: Robin Kundrata, Nicole L. Gunter, Dominika Janosikova & Ladislav Bocak (2018) Molecular evidence for the subfamilial status of Tetralobinae (Coleoptera: Elateridae), with comments on parallel evolution of some phenotypic characters. Sometimes the elytra are relatively broader posteriorly in the female e.g. Click beetle, (family Elateridae), also called skipjack, snapping beetle, or spring beetle, any of approximately 7,000 species of beetles (insect order Coleoptera) named for the clicking noise made when seized by a predator. The pronotum is generally elongate to quadrate and convex, sloping down to a flattened posterior margin and with strong impressions towards the base. Antennae serrate. Semiotinus Pjatakowa, 1941 includes 17 species, 15 of which have been transferred from the previous genus, which are separated by the straight pronotal margin. Provisional atlas of the click beetles (Coleoptera: Elateroidea) of Britain and Ireland. Oestodinae Isorhipis melasoides (Laporte, 1835) (Eucnemidae) breeding and probably established in the British Isles. All species are tropical; Cussolenis Fleutiaux, 1920 species are Asian and Australasian, Lumumbaia Muona & Vahlera, 2009 are African and Pterotarsus Guérin-Meneville, 1831, Thylacosternus Bonvouloir, 1875 and Balgus Fleutiaux, 1920 are Neotropical. The cuticle is often reticulate or variously microsculptured and has very fine micropunctures which may be granulate. generally proportionally long and either slender or robust; the pro- and mesocoxae are round and globose and the metacoxae transverse, flat and mostly hidden under expanded femoral plates. The least diverse region is Australia. Subprotelaterinae Fleutiaux, 1920 or Thylacosterninae Fleutiaux, 1920 are defined, and the modern definition includes some groups formerly regarded as distinct families e.g. Elateridae or click beetles (or "typical click beetles" to distinguish them from the related families Cerophytidae and Eucnemidae) are family of beetles. The Coleopterist, 20, 41 – 43. Although there is great diversity in the family the general form of the adults will quickly be appreciated and recognized, both in the field and in specimens or from pictures. C. brevicornis Olivier, 1790 from Italy or C. nigricollis Laporte, 1838 from Turkey. In some species the sexes are differently coloured e.g. The U.K. fauna is very poor with 4 species of Cardiophorus Eschscholtz, 1829 and a single species of Dicronychus Brullé, 1832. Variegated Carpet Larva. Most species are punctured dorsally with various punctation to the head and pronotum and punctured striae on the elytra. This is a large and cosmopolitan group of more than 3000 species included in 9 tribes and about 200 genera with the greatest diversity in Oriental and Neotropical regions. Identification is often very difficult and new species are constantly being added, not always sensibly. Some species have dark, round marks on their backs to mimic the eyes of larger animals. They are rather small, 4-8.5mm, drab insects with various pale marking to the elytra, and typical of members of either family. Distinct from two of the other large subfamilies, Elaterinae and Melanotinae, by the prognathous and flat head with mouthparts at most only weakly declined. How many species are there in the UK? This is a Neotropical group including 2 genera of unmistakable and often strikingly beautiful elaterids. They pupate underground and adults occur from April to June in temperate regions. Athous campyloides Newman, 1833 is active after dark on trunks and logs in open situations, and Stenagostus rhombeus (Olivier, 1790) will occasionally be found by sweeping foliage or flowers but on summer evenings as the light fades they may be seen in flight, often in numbers, around wooded borders. Their ecology is very diverse with many root-feeders and pest species, saproxylics as well as species with more specific requirements such as wetlands or woodlands. Here is our guide to British beetle species, including where to see and how to identify. Actenicerus sjaelandicus (Muller, O.F., 1764) and many species worldwide occur at altitudes up to the alpine zone. They were formerly included in the Eucnemidae and the placement is still doubtful; they are unusual in having antennal grooves along the sides of the pronotal hypomera, as in some Eucnemids, but have a sclerotized and exposed labrum and the fifth abdominal ventrite is free, as in elaterids. The dorsal surface is generally smooth or only moderately granulate or tuberculate and lacks any major structural modification. Insecticides should rarely be used and are not recommended in most cases. In general little is known of their biology but larvae of many are known to occur under bark or among decaying wood, under stones or debris, among leaf litter or in the soil among roots and some are known to be predaceous. The adults can be abundant in sandy or desert regions and can occur in huge numbers at light traps, they frequent flowers and are considered important pollinators in some regions. Cardiophorinae A cheerful beetle with a vicious appetite, the 7-spot is our most familiar ladybird. Eudicronychinae Parablacinae Some click beetles are large and colorful, but most are under 2 centimeters long and brown or black, without markings. Many fossil elaterids belong to the extinct subfamily Protagrypninae.. The hind angles are variously produced and often have a ridge or ridges along the dorsal surface of the extensions.  The subterranean habits of wireworms, their ability to quickly locate food by following carbon dioxide gradients produced by plant material in the soil, and their remarkable ability to recover from illness induced by insecticide exposure (sometimes after many months), make it hard to exterminate them once they have begun to attack a crop. Pangauridae Larvae are elongate, cylindrical or somewhat flattened, with hard bodies, somewhat resembling mealworms. Tetralobinae This is a small group of three genera of Asian and Oriental beetles. This is a large and cosmopolitan subfamily including at least 1100 described species in 40 genera and 2 tribes although the validity of these is questionable; the Nyctorini Semenov & Pjatakora, 1936 includes the single genus Nyctor Semenov & Pjatakora, 1936 and is often considered synonymous with the Cardiophorini Candéze, 1860. The larvae are very distinctive with a slender and cylindrical body and peculiar externally toothed mandibles and for this reason many are considered to be predacious although the Nearctic Horistonotus uhleri (Horn, 1871), known as the sand wireworm, is known to be a serious pest in the eastern United States, feeding upon the roots of a wide range of crop species. Campylidae Agrypninae It gets its name from its habit of springing upwards with an audible click if it falls on its back. Elaterid larvae are long and slender, parallel-sided and either cylindrical or flattened; most are shiny and smooth but some have prominent tubercles, specialized setae or transverse carina on the body segments and many are finely pubescent. , The oldest known species date to the Triassic, but most are problematic due to only being known from isolated elytra. During the early stages of plant growth they damage or destroy seeds and consume emerging radicals and cotyledons, then as the larvae grow they continue to feed upon the roots.  Clicking is mainly used to avoid predation, although it is also useful when the beetle is on its back and needs to right itself. With the exception of Australia they occur worldwide; there are about 150 Palaearctic species in 15 genera, and 35 species in 8 genera occur in the United States. The Prosternal sutures are wide, weakly curved at the centre and deepened anteriorly. Adults of many species feed on fresh foliage, stems and flower buds and can become pests when large populations develop as has happened with some species of Athous among cereal crops on the continent. Claws pectinate. Plastoceridae False Click? Depending upon how the group is delimited it now includes about 200 species in 20 genera with the vast majority included in Cebrio Olivier, 1790. The terminal abdominal segment is often produced and angled down and serves in locomotion, the form is very variable; in some e.g. Adults inhabit a wide range of biotopes; the majority of temperate species are occur in woodland or wooded environments although many also occur in open situations; grassland, steppes and agricultural situations etc., some are associated with wetland habitats e.g. They are either saproxylic or develop in the soil feeding upon roots etc. Adults of many species will occur at light or flight interception traps in wooded areas, and both diurnal and nocturnal species are attracted to fermenting fruit and beer traps. Asian. About 330 species of 20 genera and 4 tribes occur in the Nearctic region and of the 8 tribes and 60 Palaearctic genera 7 tribes and 22 genera are European; the U.K. fauna comprises 11 genera and about 30 species in 5 tribes and includes some of our most common e.g. The size of this subfamily has changed over recent decades as many genera have been transferred to the Adelocerini Candéze, 1857 (Pyrophorinae). as adults, and in such species mating occurs early in the year soon after they become active. The almost worldwide genus Zorochrus Thomson, C.G., 1859 includes more than 100 species, 50 of which are Palaearctic and 2 occur in the U.K. they are small, mostly wetland species whose larvae develop in marginal sand and gravel or among vegetation or roots etc. Cardiophorus is the largest genus in the subfamily with more than 600 species; more than 210, all in the nominate subgenus, occur in the Palaearctic of which about 60 are European. The head is retracted into the thorax, usually to about the posterior margin of the eyes, and prognathous or, rarely, hypognathous, and convex, as in Agriotes Eschscholtz, 1829 or flat, as in Athous Eschscholtz, 1829. They grow up to 35mm in length and are a golden brown colour. For information on image rights, click HERE. The anterior margin of the frons is entire and the mouthparts are steeply declined forward, the antennae are serrate from the fourth segment. 1842). The common name refers to the audible ‘click’ they produce when jumping into the air, they do this from an inverted position by rapidly forcing the Prosternal process into a cavity in the mesosternum, the purpose of which is to escape predators or simply to right themselves when upside down. Methods for pest control include crop rotation and clearing the land of insects before sowing. The related Violet click beetle is extremely rare in the UK, only occurring at three sites, including Windsor Great Forest. Variegated Carpet. The click beetle is named for the clicking sounds it makes while righting itself from an upside-down position. Outbreaks are controlled by deep ploughing and crop rotation but pesticides are used against serious infestations although the larvae are known to have a remarkable ability to recover from insecticide exposure. All are elongate with a sharply acuminate elytral apex, elongate pronotum and variously serrate antennae. The tribe is distinguished among the family by the following combination of characters. Click beetles are a cosmopolitan family characterized by the unusual clicking mechanism they have. Most fall within the 12-30 mm range in length, though a few species can be considerably longer. They are mostly robust and broadly-oval species with relatively short antennae which are serrate from the fourth segment .The Prosternal suture is modified into a deep antennal groove and the mid-coxal cavity is closed by the mesosternum and the metasternum. A bite from this type of beetle may cause considerable pain that could last up to a day or two. Most species develop slowly over several years and pupate in the ground. Many superficially resemble Melandryids or Tenebrionids. They are sometimes called ‘elaters’, ‘skipjacks’, ‘snapping beetles’ or ‘spring beetles’. All are quite distinctive due to the well-developed maxillary and labial palps; in some cases these are very elongate and thickened, see e.g. Adults of most species are short-lived and have a correspondingly short season although during this time they may be locally very common; spring and summer are the best times to sample them. The Violet click beetle is a very rare beetle that lives in decaying wood, particularly Common beech and Ash. There are a few other families of Elateroidea in which a few members have the same mechanism, but most elaterid subfamilies can click. Megapenthes Kiesenwetter, 1858 is a cosmopolitan genus of more than 200 species and of the 7 Palaearctic species only one occurs in Europe including the U.K., the saproxylic M. lugens (Redtenbacher. The frons is entire, not notched, and the mouthparts project forward and down. There are a few closely-related families in which a few members have the same mechanism, but all elaterids can click. Ludiidae In the United States, Dynastes beetles are generally uncommon, although the beautiful, black-spotted eastern Hercules beetles, Dynastes tityus, is occasionally found in large colonies on trees. The violet click beetle has always been rare in the UK, but further loss of ancient woodland and veteran trees poses a great risk to the already elusive beetle. The Eastern-eyed Click Beetle has a similar-looking relative in the southwestern U.S. called the Southwestern Eyed Click Beetle, as well as cousins on the West Coast and in the Pacific Northwest. Some elaterid species are bioluminescent in both larval and adult form, such as those of the genus Pyrophorus. in many Agriotes, the head and pronotum may be more transverse e.g. Arthropod Systematics & Phylogeny 76: 137-145. "Genome sequences identify three families of Coleoptera as morphologically derived click beetles (Elateridae)", "The Elateridae (Coleoptera) of the Maritime Provinces of Canada: faunal composition, new records, and taxonomic changes", 10.1603/0022-0493(2008)101[365:TSALEO]2.0.CO;2, 10.1603/0022-0493(2008)101[375:moawao]2.0.co;2, "Soil bioassay for studying behavioral responses of wireworms (Coleoptera: Elateridae) to inecticide-treated wheat seed", 10.1603/0046-225X(2007)36[1441:SBFSBR]2.0.CO;2, "Fossil Genera in Elateridae (Insecta, Coleoptera): A Triassic Origin and Jurassic Diversification", Institute of Food and Agricultural Sciences, List of subgroups of the order Coleoptera, https://en.wikipedia.org/w/index.php?title=Click_beetle&oldid=994659887, Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference, Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica, Short description is different from Wikidata, Articles to be expanded from December 2013, Articles needing translation from German Wikipedia, Wikipedia articles incorporating a citation from the Encyclopedia Americana with a Wikisource reference, Creative Commons Attribution-ShareAlike License, Click beetle adults and larvae (wireworms). while the larvae are predatory in decaying wood. All text on this site is licensed under a Creative Commons Attribution 4.0 International License. 2-spotted Larva. Applying insecticides to the soil in strips between crops has proved effective, as have poison-baited plants, pheromone traps and parasitic fungi. Ipswich: Ipswich Borough Council Museums. On hot nights they may enter houses, but are not pests there. Adrastus Eschscholtz, 1829 is a Palaearctic genus of about 25 species; of the 20 European species 2 extend to the U.K. The Prosternal suture is closed anteriorly and margined by a narrow line. The group is sometimes included in the Elaterinae with Melanotus is included in the subtribe Melanotina Candéze, 1859 of the Ampedini Fleutiaux, 1947. The thoracic segments have sclerotized plates dorsally and ventrally. They also, Athous haemorrhoidalis (Fabricius, 1801) larvae, http://data.nhm.ac.uk/dataset/collection-specimens. A single species occurs in the U.K. Cidnopus Thomson, C.G., 1859 is a Holarctic genus containing 18 species, 7 are European of which one occurs in the U.K. Kibunea Kishii, 1966 Includes the Eurasian K. minuta (Linnaeus, 1758), which occurs in the U.K., and 3 species in Japan. Other subterranean creatures such as the leatherjacket grub of crane flies which have no legs, and geophilid centipedes, which may have over two hundred, are sometimes confused with the six-legged wireworms. The widest diversity is in tropical and sub-tropical regions although they are relatively poorly represented in the Neotropics. All are saproxylic with predatory larvae. This family was defined by William Elford Leach (1790–1836) in 1815. The tarsal claws have at least one hair at the base. The Cebrionidae Latreille, 1802 was variously classified as a distinct subfamily of the Elateridae but following modern molecular analysis it is now included as two tribes of the Elaterinae; Cebrionini and Aplastini. The legs are, Sexual dimorphism in Anostirus castaneus (Müller, O.F., 1764). Some genera e.g. This page was last edited on 16 December 2020, at 21:35. Drilini. 3-20mm in length, most are black or brown, although Ampedus spp. Longhorned beetles: These beetles are named for their unusually long antennae. Many are black, but species may also be brown, reddish brown and shades between. The eyes are generally large and protruding with small facets. The antennae are inserted under the elevated lateral margin of the frons in front of the eyes, they are generally 11-segmented but have 12 , and may be simply filiform, serrate , pectinate or bipectinate, or flabellate. Physodactylinae The vertex is very variable but often bears longitudinal carina or other surface structures, the frontoclypeal suture is absent and the labrum is free. Their larvae get the name wireworms from their slender, segmented, and shiny appearance. All beetles have biting mouthparts. Common Click Beetle. Woodworm/Furniture beetle. The group is, as ever, undergoing extensive taxonomic revision and is very likely to change both in detail and extent. in Anostirus. Species of Lycoreus Candéze, 1857 are spectacular e.g. species of Athous Eschscholtz, 1829, Dalopius Eschscholtz, 1829 and Stenagostus Thomson, C.G., 1859 etc. Pyrophoridae Cmn Blk Diving Beetle. Claws simple or only feebly toothed or flanged, and without basal setae. ... European (non-UK) African. It is widespread, in continental Europe and on the British isles and its wireworm can be damaging in potatoes. Their saliva and waste can contaminate your food, which can result in food poisoning and cause infections. in Sericus brunneus (Linnaeus, 1758) the female has a patterned pronotum whereas the male is unicolourous. Special features: There are 65 different species of click beetle in the UK. The large and mostly Holarctic genus Agriotes Eschscholtz, 1829 includes more than 150 species of which 30 occur in Europe and 6 extend to the U.K. Aplotarsus Stephens, 1830 includes 8 Palaearctic species and of these 2 are Holarctic. The body form is generally convex, usually slender to broadly oval and tapering or rounded towards the apex, the largest European species is Paracalais parreissi (Laibner, 2000) and the largest of all are species of the African genus Tetralobus Lepeletier & Serville, 1828. They are very typical ‘click beetles’ with a long and relatively straight or only weakly curved outline and convex or only weakly flattened dorsal and ventral surfaces. This is a large and cosmopolitan family of about 10000 species in 400 genera and 17 subfamilies, depending upon how some of the groups e.g. is also displayed by some eucnemids, sometimes so closely that they are almost indistinguishable, and this is certainly the case with the world fauna; there has been much shuffling of groups between the families in the past and some are still assigned tentatively. They can ruin potato and root crops. Of the 4 European species, one occurs in the U.K. The greatest diversity is in the Oriental region. Other names include elaters, snapping beetles, spring beetles or skipjacks. It is listed as Endangered on the global IUCN Red List of Threatened Species and is a Priority Species under the UK Post-2010 Biodiversity Framework. Four being fused includes 8 Palaearctic species grow up to a deep caudal.... The longest U.K. species is Stenagostus rhombeus ( Olivier, 1790 ) at 21mm a to... M.J. 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