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Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Cladus: Eumetabola
Cladus: Endopterygota
Superordo: Coleopterida
Ordo: Coleoptera
Subordo: Polyphaga
Superfamilia: Curculionoidea

Familia: Curculionidae
Subfamilia: Scolytinae
Tribus: Amphiscolytini - Bothrosternini - Cactopinini - Carphodicticini - Coptonotini - Corthylini - Cryphalini - Crypturgini - Diamerini - Dryocoetini - Hexacolini - Hylastini - Hylesinini - Hylurgini - Hyorrhynchini - Hypoborini - Ipini - Micracidini - Phloeosinini - Phloeotribini - Phrixosomatini - Polygraphini - Premnobiini - Scolytini - Scolytoplatypodini - Xyleborini - Xyloctonini - Xyloterini - †Cylindrobrotini
[source: Alonso-Zarazaga & Lyal (2009)]

Check: Lepicerinus
Name

Scolytinae Latreille, 1804
References

Alonso-Zarazaga, M.A.; Lyal, C.H.C. 2009: A catalogue of family and genus group names in Scolytinae and Platypodinae with nomenclatural remarks (Coleoptera: Curculionidae). Zootaxa, 2258: 1–134. Abstract & excerpt
Amini, S., Nozari, J., Mandelshtam, M.Yu., Knížek, M., Etemad, V. & Faccoli, M. 2017. New records of Iranian bark beetles (Coleoptera: Curculionidae, Scolytinae) and their host plants. Zootaxa 4350(2): 396–400. DOI: 10.11646/zootaxa.4350.2.13. Paywall. Reference page.
Beaver, R.A.; Liu, L.Y. 2010: An annotated synopsis of Taiwanese bark and ambrosia beetles, with new synonymy, new combinations and new records (Coleoptera: Curculionidae: Scolytinae). Zootaxa, 2602: 1–47. Preview
Beaver, R.A.; Sittichaya, W.; Li, L.-Y. 2014: A synopsis of the scolytine ambrosia beetles of Thailand (Coleoptera: Curculionidae: Scolytinae). Zootaxa 3875(1): 1–82. DOI: 10.11646/zootaxa.3875.1.1 Reference page.
Bright, D.E. 2010: In memoriam. Stephen Lane Wood. In: Cognato, A.I.; Knížek, M. (eds.) Sixty years of discovering scolytine and platypodine diversity: A tribute to Stephen L. Wood. ZooKeys, 56: 7–16. DOI: 10.3897/zookeys.56.514
Bright, D.E. 2014: A catalogue of Scolytidae and Platypodidae (Coleoptera), Supplement 3 (2000-2010), with notes on subfamily and tribal reclassifications. Insecta mundi, (0346) Full issue (PDF) Reference page.
Bright, D.E.; Skidmore, R.E. 2002: A catalog of Scolytidae and Platypodidae (Coleoptera), supplement 2 (1995–1999). NRC, (44459) ISBN 0-660-18612-8 Google books
Cognato, A.I.; Grimaldi, D. 2009: 100 million years of morphological conservation in bark beetles (Coleoptera: Curculionidae: Scolytinae). Systematic entomology, 34: 93–100. DOI: 10.1111/j.1365-3113.2008.00441.x
Cognato, A.I.; Knížek, M. (eds.) 2010: Sixty years of discovering scolytine and platypodine diversity: A tribute to Stephen L. Wood. ZooKeys, 56
Cognato, A.I.; Knížek, M. 2010: Editorial. A Festschrift for Stephen L. Wood. In: Cognato, A.I.; Knížek, M. (eds.) Sixty years of discovering scolytine and platypodine diversity: A tribute to Stephen L. Wood. ZooKeys, 56: 1–5. DOI: 10.3897/zookeys.56.513
Dole, S.A., Hulcr, J. & Cognato, A.I. 2021. Species-rich bark and ambrosia beetle fauna (Coleoptera, Curculionidae, Scolytinae) of the Ecuadorian Amazonian Forest Canopy. Pp 797–813 In Spence, J.R., Casale, A., Assmann, T., Liebherr, J.K & Penev, L. (eds.). Systematic Zoology and Biodiversity Science: A tribute to Terry Erwin (1940-2020). ZooKeys 1044: 1–1042. Reference page. DOI: 10.3897/zookeys.1044.57849 Open access Reference page.
Faccoli, M., Campo, G., Perrotta, G. & Rassati, D. 2016. Two newly introduced tropical bark and ambrosia beetles (Coleoptera: Curculionidae, Scolytinae) damaging figs (Ficus carica) in southern Italy. Zootaxa 4138(1): 189–194. DOI: 10.11646/zootaxa.4138.1.10. Reference page.
Hopkins, A.D. 1915: List of generic names and their type-species in the coleopterous superfamily Scolytoidea. Proceedings U.S. National Museum, 48: 115–136.
Jordal, B.H.; Smith, S.M.; Cognato, A.I. 2014: Classification of weevils as a data-driven science: leaving opinion behind. ZooKeys 439: 1–18. DOI: 10.3897/zookeys.439.8391 Reference page.
Kirkendall, L.R.; Faccoli, M. 2010: Bark beetles and pinhole borers (Curculionidae, Scolytinae, Platypodinae) alien to Europe. In: Cognato, A.I.; Knížek, M. (eds.) Sixty years of discovering scolytine and platypodine diversity: A tribute to Stephen L. Wood. ZooKeys, 56: 227–251. DOI: 10.3897/zookeys.56.529
Latreille, P.A. 1804: Tableau méthodique des Insectes. Nouveau Dictionnaire d'Histoire Naturelle. Vol.: 24. Part: Tableaux méthodiques d'Histoire Naturelle. : 129–200 [special pagination].
I.Löbl & A.Smetana (eds). 2011 Catalogue of Palearctic Coleoptera. Vol. 7: Curculionoidea I. Apollo Books, Stenstrup, Denmark. p. 204
ISBN 978-87-88757-84-2
Morimoto, K.; Kojima, H. 2003: Morphologic characters of the weevil head and phylogenetic implications (Coleoptera, Curculionoidea). Esakia, (43): 133–169.
Donald E. Bright, Robert E. Skidmore 2002: A Catalog of Scolytidae and Platypodidae (Coleoptera): Supplement 2 (1995-1999). National Research Council of Canada, Conseil national de recherches Canada. NRC Research Press. 611 pp.
Smith, S.M., Beaver, R.A. & Cognato, A.I. 2018. New synonymy, new combinations and other taxonomic changes in Japanese xyleborine ambrosia beetles (Coleoptera: Curculionidae: Scolytinae). Zootaxa 4521(3): 391–403. DOI: 10.11646/zootaxa.4521.3.5 Paywall Reference page.
Smith, S.M., Beaver, R.A., Singh, S. & Cognato, A.I. 2018. Taxonomic clarification and neotype designation for three Indian xyleborine species (Coleoptera: Curculionidae, Scolytinae). Zootaxa 4394(1): 138–140. DOI: 10.11646/zootaxa.4394.1.9 Paywall. Reference page.
Tuncer, C., Knížek, M. & Hulcr, J. 2017. Scolytinae (Coleoptera, Curculionidae) in hazelnut orchards of Turkey: clarification of species and identification key. ZooKeys 710: 65—76. DOI: 10.3897/zookeys.710.15047. Open access. Reference page.
Wood, S.L. 2007: Bark and ambrosia beetles of South America (Coleoptera: Scolytidae). Monte L. Bean Life Science Museum, Brigham Young University, Provo. ISBN 0842526358 ISBN 9780842526357

Links

Atlas of bark beetles (Scolytidae, =Ipidae) of Russia

Vernacular names
беларуская: Караеды
čeština: Kůrovci
dansk: Barkbille
Deutsch: Borkenkäfer
English: Bark Beetles
日本語: キクイムシ亜科
lietuvių: Kinivarpos
Nederlands: Schorskevers
norsk: Barkbiller
polski: Kornikowate
русский: Короеды
svenska: Barkborrar
українська: Короїди

A bark beetle is the common name for the subfamily of beetles Scolytinae.[1] Previously, this was considered a distinct family (Scolytidae), but is now understood to be a specialized clade of the "true weevil" family (Curculionidae). Although the term "bark beetle" refers to the fact that many species feed in the inner bark (phloem) layer of trees, the subfamily also has many species with other lifestyles, including some that bore into wood, feed in fruit and seeds, or tunnel into herbaceous plants.[1] Well-known species are members of the type genus Scolytus, namely the European elm bark beetle S. multistriatus and the large elm bark beetle S. scolytus, which like the American elm bark beetle Hylurgopinus rufipes, transmit Dutch elm disease fungi (Ophiostoma). The mountain pine beetle Dendroctonus ponderosae, southern pine beetle Dendroctonus frontalis, and their near relatives are major pests of conifer forests in North America. A similarly aggressive species in Europe is the spruce ips Ips typographus. A tiny bark beetle, the coffee berry borer, Hypothenemus hampei is a major pest on coffee plantations around the world.

Life cycle and morphology

Bark beetles go through four stages of life: egg, larvae, pupae, and adult, with the time to develop often relying on the species as well as the current temperature. While there is variation among species, generally adults first bore into a tree and lay their eggs in the phloem of the tree. This usually occurs in mid to late summer. Once the eggs hatch, the larvae then live in the tree, feeding on the living tissues below the bark, often leading to death of the tree if enough larvae are present. At the end of the larval stage, chambers are usually constructed for the pupae to overwinter until they are ready to emerge as an adult. [2]

Bark beetles are distinct in their morphology due to their small size and cylindrical shape. Bark beetles also have small appendages, with antennae that can be folded into the body and large mandibles to aid in the excavation of woody tissue. The legs of most bark beetles are very short and can be retracted or folded into the body. The combination of their shape and appendages greatly helps in the excavation of woody tissue. The eyes are also flattened and hypothesized to help see in low-light conditions.[1]

Description and ecology
Mountain pine beetles killed these lodgepole pine trees in Prince George, British Columbia.

Bark beetles feed and breed between the bark and the wood of various tree species. While some species, such as the mountain pine beetle (Dendroctonus ponderosae), do attack living trees, many bark beetle species feed on weakened, dying, or dead spruce, fir, and hemlock.[3][4] Most restrict their breeding area to one part of the tree: twig, branch, stem, or root collar. Some breed in trees of only one species, while others in numerous species of tree. In undisturbed forests, bark beetles serve the purpose of hastening the recycling and decomposition of dead and dying wood and renewing the forest. However, a few species are aggressive and can develop large populations that invade and kill healthy trees and are therefore known as pests.[5]

Bark beetles often attack trees that are already weakened by disease, overcrowding, conspecific beetles, or physical damage. In defense, healthier trees may produce sap, resin or latex, which often contains a number of insecticidal and fungicidal compounds that can kill, injure, or immobilize attacking insects. Sap is one of the first lines of defense of pines against bark beetles. Released sap or resins can plug bored holes of bark beetles and seal wounds. Resins also trap insect pests making some initial entry by bark beetles unsuccessful. Chemical compounds can also be induced by tree species that bind with amino acids in the gut of bark beetles, reducing their ability to process woody materials.[3] When in large quantities, the sheer number of beetles can overwhelm the tree's defenses with resulting impacts on the lumber industry, water quality, fish and wildlife, and property values.[6]

The oldest known member of the group is Cylindrobrotus from the Early Cretaceous (Barremian) aged Lebanese amber.[7] A species of the extant mostly Neotropical genus Microborus is also known from the Cenomanian aged Burmese amber of Myanmar.[8]
Ambrosia beetles

Some bark beetles form a symbiotic relationship with certain Ophiostomatales fungi, and are named "ambrosia beetles". The ambrosia beetles (such as Xyleborus) feed on fungal "gardens" cultivated on woody tissue within the tree. Ambrosia beetles carry the fungal spores in either their gut or special structures, called mycangia, and infect the trees as they attack them. Once a beetle chooses a tree, they release spores of this fungus along tunnels within the tree. These spores grow and eventually produce fruiting structures to be consumed by the beetles. This can allow for ambrosia beetles to indirectly feed from more tree species due to the reliance on the fungi for food and the fungi's ability to overcome some of the plant's chemical defenses.[9] While the majority of ambrosia beetles infect dead trees, several species will infect trees considered healthy or under stress.[1]
As pests

Bark beetles are most commonly recognized by their impact on the lumber industry. Massive outbreaks of mountain pine beetles in western North America after about 2005 have killed millions of acres of forest from New Mexico to British Columbia.[10] Bark beetles enter trees by boring holes in the bark of the tree, sometimes using the lenticels, or the pores plants use for gas exchange, to pass through the bark of the tree.[11] As the larvae consume the inner tissues of the tree, they often consume enough of the phloem to girdle the tree, cutting off the spread of water and nutrients. Ambrosia beetles are also known to aid in the spread of pathogens, such as diseases that can cause cankers, further damaging the trees they infect. [12] Like many other insects, Scolytinae emit pheromones to attract conspecifics, which are thus drawn to trees already colonized by bark beetles. This can result in heavy infestations and eventually death of the tree.[3] Many are also attracted to ethanol produced as a byproduct of microbial growth in the dead woody tissues.[13] Increases in international trade as well as the use of wood containers for storage has aided numerous species of bark beetle in spreading across the world.[14] They are also extremely adaptable and able to quickly spread through new environments, as seen in France with eleven different species.[15] Bark beetle infestations are also predicted to increase with global warming, meaning infestations will most likely increase in frequency as temperatures rise. [16] In the past, fire has been suggested as potential mechanism for controlling bark beetle populations; however, most studies of wildfire after beetle outbreaks have found no effect of beetle-caused tree mortality on wildfire size or severity. [17][18][19]

See also

Forest pathology
Ambrosia beetle
Xyleborus glabratus
Euwallacea fornicatus
Laurel wilt disease

References

Kirkendall, Lawrence; Biedermann, Peter H.W.; Jordal, Bjarte (2015). "Chapter 3: Bark Beetles: Biology and Ecology of Native and Invasive Species". Bark Beetles: Biology and Ecology of Native and Invasive Species. Academic Press.
Barkley, Yvonne. "Everything you have always wanted to know about bark beetles, but were afraid to ask" (PDF). Archived (PDF) from the original on 2020-08-21.
Franceschi, Vincent R.; Krokene, Paal; Christiansen, Erik; Krekling, Trygve (2005-05-03). "Anatomical and chemical defenses of conifer bark against bark beetles and other pests". New Phytologist. 167 (2): 353–376. doi:10.1111/j.1469-8137.2005.01436.x. ISSN 0028-646X. PMID 15998390.
Rose, A.H.; Lindquist, O.H. 1985. Insects of eastern spruces, fir and, hemlock, revised edition. Gov’t Can., Can. For. Serv., Ottawa, For. Tech. Rep. 23. 159 p. (cited in Coates et al. 1994, cited orig ed 1977)
Blomquist, Gary J.; Figueroa-Teran, Rubi; Aw, Mory; Song, Minmin; Gorzalski, Andrew; Abbott, Nicole L.; Chang, Eric; Tittiger, Claus (2010-10-01). "Pheromone production in bark beetles". Insect Biochemistry and Molecular Biology. 40 (10): 699–712. doi:10.1016/j.ibmb.2010.07.013. ISSN 0965-1748. PMID 20727970.
Fettig, Christopher; Klepzig, Kier; Billings, Ronald; Munson, A. Steven; Nebeker, T. Evan; Negrόn, Jose; Nowak, John (Jan 2007). "The effectiveness of vegetation management practices for prevention and control of bark beetle infestations in coniferous forest of the western and southern United States". Forest Ecology and Management. 238 (1): 24–53. doi:10.1016/j.foreco.2006.10.011 – via Science Direct.
Kirejtshuk, Alexander G.; Azar, Dany; Beaver, Roger A.; Mandelshtam, Mikhail Yu.; Nel, André (January 2009). "The most ancient bark beetle known: a new tribe, genus and species from Lebanese amber (Coleoptera, Curculionidae, Scolytinae)". Systematic Entomology. 34 (1): 101–112. doi:10.1111/j.1365-3113.2008.00442.x. S2CID 73530299.
Cognato, Anthony I.; Grimaldi, David (January 2009). "100 million years of morphological conservation in bark beetles (Coleoptera: Curculionidae: Scolytinae)". Systematic Entomology. 34 (1): 93–100. doi:10.1111/j.1365-3113.2008.00441.x. S2CID 85272919.
Kirkendall, Lawrence R.; Biedermann, Peter H.W.; Jordal, Bjarte H. (2015), "Evolution and Diversity of Bark and Ambrosia Beetles", Bark Beetles, Elsevier, pp. 85–156, doi:10.1016/b978-0-12-417156-5.00003-4, ISBN 978-0-12-417156-5, retrieved 2021-03-30
Jim Robins (17 Nov 2008). "Bark Beetles Kill Millions of Acres of Trees in West". The New York Times.
Franceschi, Vincent R.; Krokene, Paal; Christiansen, Erik; Krekling, Trygve (2005-05-03). "Anatomical and chemical defenses of conifer bark against bark beetles and other pests". New Phytologist. 167 (2): 353–376. doi:10.1111/j.1469-8137.2005.01436.x. ISSN 0028-646X. PMID 15998390.
Li, You; Skelton, James; Adams, Sawyer; Hattori, Yukako; Smith, Matthew E.; Hulcr, Jiri (2020). "The Ambrosia Beetle Sueus niisimai (Scolytinae: Hyorrhynchini) is Associated with the Canker Disease Fungus Diatrypella japonica (Xylariales)". Plant Disease. 104 (12): 3143–3150. doi:10.1094/pdis-03-20-0482-re. ISSN 0191-2917. PMID 33136520. S2CID 225788674.
Lindelöw, Åke; Risberg, Birger; Sjödin, Kristina (1992). "Attraction during flight of scolytids and other bark- and wood-dwelling beetles to volatiles from fresh and stored spruce wood". Canadian Journal of Forest Research. 22 (2): 224–228. doi:10.1139/x92-029. ISSN 0045-5067.
Brockerhoff, E. G.; Liebhold, A. M. (2017-07-20). "Ecology of forest insect invasions". Biological Invasions. 19 (11): 3141–3159. doi:10.1007/s10530-017-1514-1. ISSN 1387-3547. S2CID 34192154.
Barnouin, Thomas; Soldati, Fabien; Roques, Alain; Faccoli, Massimo; Kirkendall, Lawrence; Moutter, Raphaëlle; Daubree, Jean-Baptiste; Noblecourt, Thierry (2020-11-09). "Bark beetles and pinhole borers recently or newly introduced to France (Coleoptera: Curculionidae, Scolytinae and Platypodinae)". Zootaxa. 4877 (1): 51–74. doi:10.11646/zootaxa.4877.1.2. ISSN 1175-5334. PMID 33311325. S2CID 228840630.
Andreas Sommerfeld; Werner Rammer; Marco Heurich; Torben Hilmers; Jörg Müller; Rupert Seidl (2020-07-20). "Author response for "Do bark beetle outbreaks amplify or dampen future bark beetle disturbances in Central Europe?"". doi:10.1111/1365-2745.13502/v3/response1. S2CID 242935910.
Harvey, Brian J.; Donato, Daniel C.; Romme, William H.; Turner, Monica G. (2013-11-01). "Influence of recent bark beetle outbreak on fire severity and postfire tree regeneration in montane Douglas-fir forests". Ecology. 94 (11): 2475–2486. doi:10.1890/13-0188.1. ISSN 1939-9170. PMID 24400499. S2CID 7023088.
Meigs, Garrett W.; Campbell, John L.; Zald, Harold S. J.; Bailey, John D.; Shaw, David C.; Kennedy, Robert E. (2015-07-01). "Does wildfire likelihood increase following insect outbreaks in conifer forests?" (PDF). Ecosphere. 6 (7): art118. doi:10.1890/ES15-00037.1. ISSN 2150-8925.
Harvey, Brian J.; Donato, Daniel C.; Turner, Monica G. (2014-10-21). "Recent mountain pine beetle outbreaks, wildfire severity, and postfire tree regeneration in the US Northern Rockies". Proceedings of the National Academy of Sciences. 111 (42): 15120–15125. Bibcode:2014PNAS..11115120H. doi:10.1073/pnas.1411346111. ISSN 0027-8424. PMC 4210318. PMID 25267633.

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