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]
Females typically have a special ovipositor for inserting eggs into hosts or places that are otherwise inaccessible. The ovipositor is often modified into a stinger. The young develop through holometabolism (complete metamorphosis)—that is, they have a worm-like larval stage and an inactive pupal stage before they mature.
Contents
1Etymology
2Evolution
3Anatomy
4Reproduction
4.1Sex determination
4.2Thelytoky
5Diet
6Classification
6.1Symphyta
6.2Apocrita
7See also
8References
9Bibliography
10External links
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. The Ancient Greek ὑμήν (hymen) for membrane provides a plausible etymology for the term because species in this order have membranous wings. However, a key characteristic of this order is that the hind wings are connected to the fore wings 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.
Evolution
The cladogram of external relationships, based on a 2008 DNA and protein analysis, shows the order as a clade, most closely related to endopterygote orders including the Diptera (true flies) and Lepidoptera (butterflies and moths).[6][7][8][9]
part of Endopterygota
Antliophora
Diptera (true flies)
Mecoptera (scorpionflies)
Boreidae (snow scorpionflies)
Siphonaptera (fleas)
Trichoptera (caddisflies)
Lepidoptera (butterflies and moths)
Hymenoptera (sawflies, wasps, ants, bees)
Hymenoptera originated in the Triassic, with the oldest fossils belonging to the family Xyelidae. Social hymenopterans appeared during the Cretaceous.[10] The evolution of this group has been intensively studied by Alex Rasnitsyn, Michael S. Engel, and others.[11]
This clade has been studied by examining the mitochondrial DNA.[12] Although this study was unable to resolve all the ambiguities in this clade, some relationships could be established. The Aculeata, Ichneumonomorpha, and Proctotrupomorpha were monophyletic. The Megalyroidea and Trigonalyoidea are sister clades as are the Chalcidoidea+Diaprioidea. The Cynipoidea was generally recovered as the sister group to Chalcidoidea and Diaprioidea which are each other's closest relations.
The cladogram is based on Schulmeister 2003.[13][14]
Hymenoptera
Hymenoptera, 250mya
Xyeloidea (Triassic-present)
Tenthredinoidea
Pamphilioidea
Unicalcarida
Cephoidea (stem sawflies)
Siricoidea (horntails or wood wasps)
Xiphydrioidea (wood wasps)
parasitism
Orussoidea (parasitic wood wasps)
"wasp waist" 200mya
APOCRITA (ants, bees, wasps)
Symphyta
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 immobilise prey, but in some wasps and bees may be used in defense.[15]
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.[15] The larvae of stinging forms (Aculeata) generally have 10 pairs of spiracles, or breathing pores, whereas parasitic forms usually have nine pairs present.[16]
Reproduction
Sex determination
Main article: Haplodiploid sex-determination system
Among most or all hymenopterans, sex is determined by the number of chromosomes an individual possesses.[17] 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.[15] 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 actually determined by a single gene locus with many alleles.[17] 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.[18]
One consequence of haplodiploidy is that females on average actually have more genes in common with their sisters than they do with their own 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.[15][19] 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.[20]
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.[21]
Thelytoky
Main article: 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,[22] the clonal raider ant Cerapachys biroi,[23] the predaceous ant Platythyrea punctata,[24] and the electric ant (little fire ant) Wasmannia auropunctata.[25] It also occurs in the Cape honey bee Apis mellifera capensis.[26]
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[24] and Wasmannia auropunctata[25] and the honey bee Apis mellifera capensis.[26] In A. m. capensis, the recombination rate during meiosis is reduced more than tenfold.[26] In W. auropunctata the reduction is 45 fold.[25]
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.[27]
Diet
Different species of Hymenoptera show a wide range of feeding habits. The most primitive forms are typically herbivorous, feeding on leaves or pine needles. Stinging wasps are predators, and will provision their larvae with immobilised prey, while bees feed on nectar and pollen.
Main article: 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.[28] 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.[15]
Classification
Symphyta, without a waist: the sawfly Arge pagana
Apocrita, with narrow waists: 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.[29]
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.[29]
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. In general, the anus only opens at the completion of larval growth.[29]
See also
Hymenoptera genome database
Insects in literature (ant, bee, wasp)
Worker policing
References
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^ abKellner, 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.
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External links
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v
t
e
Extant Hymenopteran families
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Subclass: Pterygota
Infraclass: Neoptera
Superorder: Endopterygota
S y m p h y t a
Xyeloidea
Xyelidae
Pamphilioidea
Megalodontesidae
Pamphiliidae (web-spinning sawflies)
Tenthredinoidea
Argidae (argid sawflies)
Blasticotomidae (fern sawflies)
Cimbicidae (cimbicid sawflies)
Diprionidae (conifer sawflies)
Pergidae (pergid sawflies)
Tenthredinidae (common sawflies)
U n i c.
Cephoidea
Cephidae (stem sawflies)
Siricoidea
Anaxyelidae (cedar wood wasps)
Siricidae (horntails)
Xiphydrioidea
Xiphydriidae (wood wasps)
Orussoidea
Orussidae (parasitic wood wasps)
A p o c r i t a
U n i c a l c a r i d a
P a r a s i t i c a
Ichneumonoidea
Braconidae (braconids)
Ichneumonidae (ichneumon wasps)
Ceraphronoidea
Ceraphronidae
Megaspilidae
Proctotrupomorpha
Platygastroidea
Platygastridae
Scelionidae
Cynipoidea
Austrocynipidae
Cynipidae (gall wasps)
Figitidae
Ibaliidae
Liopteridae
Proctotrupoidea(s.str.)
Proctorenyxidae
Roproniidae
Heloridae
Pelecinidae
Peradeniidae
Proctotrupidae
Vanhorniidae
Diaprioidea
Austroniidae
Diapriidae
Ismaridae
Maamingidae
Monomachidae
Mymarommatoidea
Gallorommatidae
Mymarommatidae
Chalcidoidea (chalcid wasps)
Agaonidae (fig wasps)
Aphelinidae
Chalcididae
Encyrtidae
Eucharitidae
Eulophidae
Eupelmidae
Eurytomidae
Leucospidae
Mymaridae (fairyflies)
Ormyridae
Perilampidae
Pteromalidae
Rotoitidae
Signiphoridae
Tanaostigmatidae
Tetracampidae
Torymidae
Trichogrammatidae
Evanioidea
Aulacidae
Evaniidae (ensign wasps)
Gasteruptiidae
Stephanoidea
Stephanidae
Megalyroidea
Megalyridae
Trigonaloidea
Trigonalidae
A c u l e a t a
Chrysidoidea
Bethylidae
Chrysididae (cuckoo wasps)
Dryinidae
Embolemidae
Plumariidae
Sclerogibbidae
Scolebythidae
Vespoidea
Rhopalosomatidae (rhopalosomatid wasps)
Vespidae (paper wasps, potter wasps, pollen wasps, yellowjackets, hornets)
…: The winged Hymenoptera: Apidae family (honey bees and bumble bees). Vespidae family (yellow jackets , yellow hornets, white-faced hornets, and paper wasps ). The wingless Hymenoptera: Formicidae family …
… adults allergic to winged Hymenoptera species . There is an additional randomized, placebo-controlled trial demonstrating the effectiveness of jack jumper ant (another Hymenoptera species) VIT . One of the …
… The vast majority of yellow jacket-allergic patients also have positive skin tests to yellow hornet and white-faced hornet venoms because these insects are in the same Hymenoptera subfamily These patients …
… Other types of Hymenoptera of medical importance are stinging ants (fire ants, harvester ants, bulldog ants, and jack jumper ants). Patients with allergy to winged Hymenoptera should not be presumed …
… can sting more than once, while honey bees lose their sting apparatus. Adults with concomitant cardiovascular disease are at increased risk for severe SARs to Hymenoptera stings and poor outcomes resulting …
English Journal
From laboratory to the field: consistent effects of experience on host location by the fruit fly parasitoid Diachasmimorpha kraussii (Hymenoptera: Braconidae).
Masry A, Cunningham JP, Clarke AR.
Insect science. 2019 Oct;26(5)863-872.
Associative learning is well documented in Hymenopteran parasitoids, where it is thought to be an adaptive mechanism for increasing successful host location in complex environments. Based on this learning capacity, it has been suggested that providing prerelease training to parasitoids reared for in
Stable carbon isotope ratios for organic acids in commercial honey samples.
Kawashima H, Suto M, Suto N.
Food chemistry. 2019 Aug;289()49-55.
Stable carbon isotope ratios (δC) for glucose, fructose, disaccharides, trisaccharides, and organic acids in 116 commercial honey samples were measured by LC/IRMS. On the basis of EA/IRMS and LC/IRMS authenticity criteria, 39 of the samples were judged to have been adulterated. The δC values for o
Is Planting Trees Enough? The Effect of Different Types of Reforestation on the Offspring of Trypoxylon (Trypargilum) lactitarse (Hymenoptera: Crabronidae) in the Southern Amazon.
de Araújo GJ, Storck-Tonon D, Izzo TJ.
Neotropical entomology. 2019 Aug;48(4)572-582.
The deforestation has led to local loss of species and important ecosystem services performed by them, causing ecological and economic losses. It is proposed that the reforestation of such areas aims to reduce those impacts. However, particularly in the tropics, little is known about the real succes
Wasabi versus red imported fire ants : preliminary test of repellency of microencapsulated allyl isothiocyanate against Solenopsis invicta (Hymenoptera: Formicidae) using bait traps in Taiwan
Hymenopteran: Hymenopteran, (order Hymenoptera), any member of the third largest—and perhaps the most beneficial to humans—of all insect orders. More than 115,000 species have been described, including ants, bees ...