Biology:Hymenoptera

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Short description: Order of insects comprising sawflies, wasps, bees, and ants

Hymenoptera
Temporal range: Triassic–present 235–0 Ma[1]
Hymenoptera.jpg
Hymenopterans from different families; Clockwise from top-left: Red imported fire ant (Formicidae), Vespula vulgaris (Vespidae), Tenthredopsis sordida (Tenthredinidae), and Western honey bee (Apidae)
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
(unranked): Holometabola
Superorder: Hymenopterida
Order: Hymenoptera
Linnaeus, 1758
Suborders

Hymenoptera is a large order of insects, comprising the sawflies, wasps, bees, and ants. Over 150,000 living species of Hymenoptera have been described,[2][3] in addition to over 2,000 extinct ones.[4] Many of the species are parasitic. Females typically have a special ovipositor for inserting eggs into hosts or places that are otherwise inaccessible. This ovipositor is often modified into a stinger. The young develop through holometabolism (complete metamorphosis)—that is, they have a wormlike larval stage and an inactive pupal stage before they mature.

Etymology

The name Hymenoptera refers to the wings of the insects, but the original derivation is ambiguous.[5]:42 All references agree that the derivation involves the Ancient Greek πτερόν (pteron) for wing.[6] The Ancient Greek ὑμήν (hymen) for membrane provides a plausible etymology for the term because species in this order have membranous wings.[6] However, a key characteristic of this order is that the hindwings are connected to the forewings by a series of hooks. Thus, another plausible etymology involves Hymen, the Ancient Greek god of marriage, as these insects have married wings in flight. Another suggestion for the inclusion of Hymen is the myth of Melissa, a nymph with a prominent role at the wedding of Zeus.[citation needed]

Evolution

Molecular analysis finds that Hymenoptera is the earliest branching group of Holometabola.[7]

Holometabola
 

Hymenoptera (sawflies, wasps) European wasp white bg.jpg

 
Aparaglossata
Neuropteroidea
Neuropterida
 

Raphidioptera (snakeflies) Raphidia icon.png

 
 
 

Megaloptera (alderflies and allies) Corydalus cornutus illustration (rotated).png

 
 

Neuroptera (Lacewings and allies) Osmylus (white background).jpg

 
 
 
Coleopterida
 

Coleoptera (beetles) Pseudacrossus przewalskyi (Reitter, 1887).jpg

 
 

Strepsiptera (twisted-wing parasites) Elenchus koebelei.jpg

 
 
 
Panorpida
Amphiesmenoptera
 

Trichoptera (caddisflies) RHYACOPHILA DORSALIS Male Pont Forge de Sailly Watigny 02 MHNT.jpg

 
 

Lepidoptera (butterflies, moths) Arctia villica SLU.JPG

 
 
Antliophora
 

Diptera Common house fly, Musca domestica.jpg

 
 
 

Mecoptera (scorpionflies) Scorpionfly (white background).jpg

 
 

Siphonaptera (fleas) Pulex irritans female ZSM (white background).jpg

 
 
 
 
 
 

Hymenoptera originated in the Triassic, with the oldest fossils belonging to the family Xyelidae. Social hymenopterans appeared during the Cretaceous.[8] The evolution of this group has been intensively studied by Alex Rasnitsyn, Michael S. Engel, and others.[9]

Phylogenetic relationships within the Hymenoptera, based on both morphology and molecular data, have been intensively studied since 2000.[10] In 2023, a molecular study[10] based on the analysis of ultra-conserved elements confirmed many previous findings and produced a relatively robust phylogeny of the whole Order. Basal superfamilies are shown in the cladogram below.

Hymenoptera
Hymenoptera
 

Tenthredinoidea Endelomyia rosae.jpg

 
 
 

Xyeloidea (Triassic-present) Xyelapusilla.jpg

 
 
 

Pamphilioidea Pamphilus icon.png

 
Unicalcarida
 
 

Siricoidea (horntails or wood wasps) Hymenoptera Vielfalt Horntail.jpg

 
 

Xiphydrioidea (wood wasps) Xiphydria prolongata crop.jpg

 
 
 
 

Cephoidea (stem sawflies) Hartigia linearis.jpg

 
parasitism
 

Orussoidea (parasitic wood wasps) Orussus coronatus.jpg

 
"wasp waist"

Apocrita (ants, bees, wasps) Specimen of Podalonia tydei (Le Guillou, 1841).jpg

200mya
 
 
 
 
 
250mya
Symphyta (red bar) are paraphyletic as Apocrita are excluded.

Anatomy

Bombus muscorum drinking nectar with its long proboscis

Hymenopterans range in size from very small to large insects, and usually have two pairs of wings. Their mouthparts are adapted for chewing, with well-developed mandibles (ectognathous mouthparts). Many species have further developed the mouthparts into a lengthy proboscis, with which they can drink liquids, such as nectar. They have large compound eyes, and typically three simple eyes, ocelli.

The forward margin of the hind wing bears a number of hooked bristles, or "hamuli", which lock onto the fore wing, keeping them held together. The smaller species may have only two or three hamuli on each side, but the largest wasps may have a considerable number, keeping the wings gripped together especially tightly. Hymenopteran wings have relatively few veins compared with many other insects, especially in the smaller species.

In the more ancestral hymenopterans, the ovipositor is blade-like, and has evolved for slicing plant tissues. In the majority, however, it is modified for piercing, and, in some cases, is several times the length of the body. In some species, the ovipositor has become modified as a stinger, and the eggs are laid from the base of the structure, rather than from the tip, which is used only to inject venom. The sting is typically used to immobilize prey, but in some wasps and bees may be used in defense.[8]

Hymenopteran larvae typically have a distinct head region, three thoracic segments, and usually nine or 10 abdominal segments. In the suborder Symphyta, the larvae resemble caterpillars in appearance, and like them, typically feed on leaves. They have large chewing mandibles, three pairs of thoracic limbs, and, in most cases, six or eight abdominal prolegs. Unlike caterpillars, however, the prolegs have no grasping spines, and the antennae are reduced to mere stubs. Symphytan larvae that are wood borers or stem borers have no abdominal legs and the thoracic legs are smaller than those of non-borers.

With rare exceptions, larvae of the suborder Apocrita have no legs and are maggotlike in form, and are adapted to life in a protected environment. This may be the body of a host organism, or a cell in a nest, where the adults will care for the larva. In parasitic forms, the head is often greatly reduced and partially withdrawn into the prothorax (anterior part of the thorax). Sense organs appear to be poorly developed, with no ocelli, very small or absent antennae, and toothlike, sicklelike, or spinelike mandibles. They are also unable to defecate until they reach adulthood due to having an incomplete digestive tract (a blind sac), presumably to avoid contaminating their environment.[8] The larvae of stinging forms (Aculeata) generally have 10 pairs of spiracles, or breathing pores, whereas parasitic forms usually have nine pairs present.[11]

Reproduction

Sex determination

Among most or all hymenopterans, sex is determined by the number of chromosomes an individual possesses.[12] Fertilized eggs get two sets of chromosomes (one from each parent's respective gametes) and develop into diploid females, while unfertilized eggs only contain one set (from the mother) and develop into haploid males. The act of fertilization is under the voluntary control of the egg-laying female, giving her control of the sex of her offspring.[8] This phenomenon is called haplodiploidy.

However, the actual genetic mechanisms of haplodiploid sex determination may be more complex than simple chromosome number. In many Hymenoptera, sex is determined by a single gene locus with many alleles.[12] In these species, haploids are male and diploids heterozygous at the sex locus are female, but occasionally a diploid will be homozygous at the sex locus and develop as a male, instead. This is especially likely to occur in an individual whose parents were siblings or other close relatives. Diploid males are known to be produced by inbreeding in many ant, bee, and wasp species. Diploid biparental males are usually sterile but a few species that have fertile diploid males are known.[13]

One consequence of haplodiploidy is that females on average have more genes in common with their sisters than they do with their daughters. Because of this, cooperation among kindred females may be unusually advantageous and has been hypothesized to contribute to the multiple origins of eusociality within this order.[8][14] In many colonies of bees, ants, and wasps, worker females will remove eggs laid by other workers due to increased relatedness to direct siblings, a phenomenon known as worker policing.[15]

Another consequence is that hymenopterans may be more resistant to the deleterious effects of inbreeding. As males are haploid, any recessive genes will automatically be expressed, exposing them to natural selection. Thus, the genetic load of deleterious genes is purged relatively quickly.[16]

Thelytoky

Some hymenopterans take advantage of parthenogenesis, the creation of embryos without fertilization. Thelytoky is a particular form of parthenogenesis in which female embryos are created (without fertilisation). The form of thelytoky in hymenopterans is a kind of automixis in which two haploid products (proto-eggs) from the same meiosis fuse to form a diploid zygote. This process tends to maintain heterozygosity in the passage of the genome from mother to daughter. It is found in several ant species including the desert ant Cataglyphis cursor,[17] the clonal raider ant Cerapachys biroi,[18] the predaceous ant Platythyrea punctata,[19] and the electric ant (little fire ant) Wasmannia auropunctata.[20] It also occurs in the Cape honey bee Apis mellifera capensis.[21]

Oocytes that undergo automixis with central fusion often have a reduced rate of crossover recombination, which helps to maintain heterozygosity and avoid inbreeding depression. Species that display central fusion with reduced recombination include the ants Platythyrea punctata[19] and Wasmannia auropunctata[20] and the Cape honey bee Apis mellifera capensis.[21] In A. m. capensis, the recombination rate during meiosis is reduced more than tenfold.[21] In W. auropunctata the reduction is 45 fold.[20]

Single queen colonies of the narrow headed ant Formica exsecta illustrate the possible deleterious effects of increased homozygosity. Colonies of this species which have more homozygous queens will age more rapidly, resulting in reduced colony survival.[22]

Diet

Different species of Hymenoptera show a wide range of feeding habits. The most primitive forms are typically phytophagous, feeding on flowers, pollen, foliage, or stems. Stinging wasps are predators, and will provision their larvae with immobilised prey, while bees feed on nectar and pollen.

Main page: Biology:Parasitoid wasp

A huge number of species are parasitoids as larvae. The adults inject the eggs into a host, which they begin to consume after hatching. For example, the eggs of the endangered Papilio homerus are parasitized at a rate of 77%, mainly by Hymenoptera species.[23] Some species are even hyperparasitoid, with the host itself being another parasitoid insect. Habits intermediate between those of the herbivorous and parasitoid forms are shown in some hymenopterans, which inhabit the galls or nests of other insects, stealing their food, and eventually killing and eating the occupant.[8]

Classification

Symphyta, without a waist: the sawfly Arge pagana
Apocrita, with narrow waist: the wasp Vespula germanica

The Hymenoptera are divided into two groups; the Symphyta which have no waist, and the Apocrita which have a narrow waist.[4]

Symphyta

The suborder Symphyta includes the sawflies, horntails, and parasitic wood wasps. The group may be paraphyletic, as it has been suggested that the family Orussidae may be the group from which the Apocrita arose. They have an unconstricted junction between the thorax and abdomen. The larvae are herbivorous, free-living, and eruciform, with three pairs of true legs, prolegs (on every segment, unlike Lepidoptera) and ocelli. The prolegs do not have crochet hooks at the ends unlike the larvae of the Lepidoptera.[4]

Apocrita

The wasps, bees, and ants together make up the suborder (and clade) Apocrita, characterized by a constriction between the first and second abdominal segments called a wasp-waist (petiole), also involving the fusion of the first abdominal segment to the thorax. Also, the larvae of all Apocrita lack legs, prolegs, or ocelli. The hindgut of the larvae also remains closed during development, with feces being stored inside the body, with the exception of some bee larvae where the larval anus has reappeared through developmental reversion.[clarification needed] In general, the anus only opens at the completion of larval growth.[4]

Threats

Hymenoptera as a group are highly susceptible to habitat loss, which can lead to substantial decreases in species richness and have major ecological implications due to their pivotal role as plant pollinators.[24]

See also

References

  1. ↑ Ronquist, Fredrik; Klopfstein, Seraina; Vilhelmsen, Lars; Schulmeister, Susanne; Murray, Debra L.; Rasnitsyn, Alexandr P. (December 2012). "A Total-Evidence Approach to Dating with Fossils, Applied to the Early Radiation of the Hymenoptera". Systematic Biology 61 (6): 973–999. doi:10.1093/sysbio/sys058. PMID 22723471. 
  2. ↑ Mayhew, Peter J. (2007). "Why are there so many insect species? Perspectives from fossils and phylogenies". Biological Reviews 82 (3): 425–454. doi:10.1111/j.1469-185X.2007.00018.x. PMID 17624962. 
  3. ↑ Janke, Axel; Klopfstein, Seraina; Vilhelmsen, Lars; Heraty, John M.; Sharkey, Michael; Ronquist, Fredrik (2013). "The Hymenopteran Tree of Life: Evidence from Protein-Coding Genes and Objectively Aligned Ribosomal Data". PLOS ONE 8 (8): e69344. doi:10.1371/journal.pone.0069344. PMID 23936325. Bibcode: 2013PLoSO...869344K. 
  4. ↑ 4.0 4.1 4.2 4.3 Aguiar, A.P.; Deans, A.R.; Engel, M.S.; Forshage, M.; Huber, J.T.; Jennings, J.T.; Johnson, N.F.; Lelej, A.S. et al. (2013). "Order Hymenoptera Linnaeus, 1758. In: Zhang, Z.-Q. (Ed.) Animal Biodiversity: An Outline of Higher-level Classification and Survey of Taxonomic Richness (Addenda 2013)". Zootaxa 3703: 1–82. doi:10.11646/zootaxa.3703.1.12. PMID 26146682. 
  5. ↑ Grissell, Eric (2010). Bees, Wasps, and Ants: The Indispensable Role of Hymenoptera in Gardens. Timber Press. ISBN 9780881929881. https://archive.org/details/isbn_9780881929881. 
  6. ↑ 6.0 6.1 Carpenter, George Herbert (1911). "Hymenoptera". in Chisholm, Hugh. Encyclopædia Britannica. 14 (11th ed.). Cambridge University Press. p. 177. 
  7. ↑ Kjer, Karl M.; Simon, Chris; Yavorskaya, Margarita; Beutel, Rolf G. (2016). "Progress, pitfalls and parallel universes: a history of insect phylogenetics". Journal of the Royal Society Interface 13 (121): 121. doi:10.1098/rsif.2016.0363. PMID 27558853. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Howell, H.V.; Doyen, J.T.; Purcell, A.H. (1998). Introduction to Insect Biology and Diversity (2nd ed.). Oxford University Press. p. 320. ISBN 978-0-19-510033-4. 
  9. ↑ Peters, Ralph S.; Krogmann, Lars; Mayer, Christoph; Donath, Alexander; Gunkel, Simon; Meusemann, Karen; Kozlov, Alexey; Podsiadlowski, Lars et al. (April 2017). "Evolutionary History of the Hymenoptera". Current Biology 27 (7): 1013–1018. doi:10.1016/j.cub.2017.01.027. PMID 28343967. 
  10. ↑ 10.0 10.1  , Wikidata Q117865968
  11. ↑ Hunt, James H. (2007). The Evolution of Social Wasps. Oxford University Press, USA. p. 12. ISBN 978-0-19-804207-5. https://books.google.com/books?id=bFMoSxCVSVIC&pg=PA12. 
  12. ↑ 12.0 12.1 Cowan, David P. Cowan; Stahlhut, Julie K. (13 July 2004). "Functionally reproductive diploid and haploid males in an inbreeding hymenopteran with complementary sex determination". PNAS 101 (28): 10374–10379. doi:10.1073/pnas.0402481101. PMID 15232002. Bibcode: 2004PNAS..10110374C. 
  13. ↑ Elias, J.; Mazzi, D.; Dorn, S. (2009). Bilde, Trine. ed. "No Need to Discriminate? Reproductive Diploid Males in a Parasitoid with Complementary Sex Determination". PLOS ONE 4 (6): e6024. doi:10.1371/journal.pone.0006024. PMID 19551142. Bibcode: 2009PLoSO...4.6024E. 
  14. ↑ Quiñones, Andrés E.; Pen, Ido (June 2017). "A unified model of Hymenopteran preadaptations that trigger the evolutionary transition to eusociality". Nature Communications 8: 15920. doi:10.1038/ncomms15920. PMID 28643786. Bibcode: 2017NatCo...815920Q. 
  15. ↑ Davies, N.R.; Krebs, J.R.; and West, S.A. An Introduction to Behavioral Ecology. 4th ed. West Sussex: Wiley-Blackwell, 2012. pp. 387–388
  16. ↑ LaSalle, John; David, Gauld, Ian (1993). Hymenoptera and biodiversity. C.A.B. International. ISBN 978-0851988306. OCLC 28576921. 
  17. ↑ Pearcy, M.; Aron, S.; Doums, C.; Kelle, L. (2004). "Conditional use of sex and parthenogenesis for worker and queen production in ants". Science 306 (5702): 1780–3. doi:10.1126/science.1105453. PMID 15576621. Bibcode: 2004Sci...306.1780P. https://dipot.ulb.ac.be/dspace/bitstream/2013/18807/1/061PearcyScience04.pdf. 
  18. ↑ Oxley, P. R.; Ji, L.; Fetter-Pruneda, I.; McKenzie, S. K.; Li, C.; Hu, H.; Zhang, G.; Kronauer, D. J. (2014). "The genome of the clonal raider ant Cerapachys biroi". Curr. Biol. 24 (4): 451–8. doi:10.1016/j.cub.2014.01.018. PMID 24508170. 
  19. ↑ 19.0 19.1 Kellner, Katrin; Heinze, Jürgen (2011). "Mechanism of facultative parthenogenesis in the ant Platythyrea punctata". Evolutionary Ecology 25: 77–89. doi:10.1007/s10682-010-9382-5. 
  20. ↑ 20.0 20.1 20.2 Rey, O.; Loiseau, A.; Facon, B.; Foucaud, J.; Orivel, J.; Cornuet, J. M.; Robert, S.; Dobigny, G. et al. (2011). "Meiotic recombination dramatically decreased in thelytokous queens of the little fire ant and their sexually produced workers". Mol. Biol. Evol. 28 (9): 2591–601. doi:10.1093/molbev/msr082. PMID 21459760. 
  21. ↑ 21.0 21.1 21.2 Baudry, E.; Kryger, P.; Allsopp, M.; Koeniger, N.; Vautrin D.; Mougel F.; Cornuet JM.; Solignac M. (2004). "Whole-genome scan in the lytokous-laying workers of the Cape honeybee (Apis mellifera capensis): central fusion, reduced recombination rates and centromere mapping using half-tetrad analysis". Genetics 167 (1): 243–252. doi:10.1534/genetics.167.1.243. PMID 15166151. 
  22. ↑ "Fitness and the level of homozygosity in a social insect". J. Evol. Biol. 22 (1): 134–142. 2009. doi:10.1111/j.1420-9101.2008.01635.x. PMID 19127611. http://doc.rero.ch/record/11248/files/haag_flh.pdf. 
  23. ↑ Lehnert, Matthew S.; Kramer, Valerie R.; Rawlins, John E.; Verdecia, Vanessa; Daniels, Jaret C. (2017-07-10). "Jamaica's Critically Endangered Butterfly: A Review of the Biology and Conservation Status of the Homerus Swallowtail (Papilio (Pterourus) homerus Fabricius)". Insects 8 (3): 68. doi:10.3390/insects8030068. PMID 28698508. 
  24. ↑ Spiesman, Brian J.; Inouye, Brian D. (December 2013). "Habitat loss alters the architecture of plant–pollinator interaction networks". Ecology 94 (12): 2688–2696. doi:10.1890/13-0977.1. ISSN 0012-9658. PMID 24597216. https://doi.org/10.1890/13-0977.1. 

External links

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Wikidata ☰ Q22651 entry



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