Hymenoptera
Hymenoptera | |
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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 | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
(unranked): | Holometabola |
Superorder: | Hymenopterida |
Order: | Hymenoptera Linnaeus, 1758 |
Suborders | |
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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
Etymology
The name Hymenoptera refers to the wings of the insects, but the original derivation is ambiguous.
Evolution
Molecular analysis finds that Hymenoptera is the earliest branching group of Holometabola.[7]
Holometabola |
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Hymenoptera originated in the
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 | |||||||||||||||||||||||
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Symphyta (red bar) are paraphyletic as Apocrita are excluded. |
Anatomy
Hymenopterans range in size from very small to large insects, and usually have two pairs of wings. Their
The forward margin of the hind wing bears a number of hooked bristles, or "
In the more ancestral hymenopterans, the
Hymenopteran larvae typically have a distinct head region, three thoracic segments, and usually nine or 10 abdominal segments. In the suborder
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 In parasitic forms, the head is often greatly reduced and partially withdrawn into the prothorax (anterior part of the thorax).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
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.
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
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.
A huge number of species are
Classification
The Hymenoptera are divided into two groups; the
Symphyta
The suborder
Apocrita
The
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.[25]
See also
- Hymenoptera Genome Database
- Insects in literature (ant, bee, wasp)
- Worker policing
References
- PMID 22723471.
- S2CID 9356614.
- PMID 23936325.
- ^ PMID 26146682.
- ISBN 9780881929881.
- ^ a b Carpenter, George Herbert (1911). . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 14 (11th ed.). Cambridge University Press. p. 177.
- PMID 27558853.
- ^ a b c d e f
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.
- PMID 28343967.
- ^ Wikidata Q117865968.
- ISBN 978-0-19-804207-5.
- ^ PMID 15232002.
- PMID 19551142.
- PMID 28643786.
- ^ 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
- )
- S2CID 37558595.
- PMID 24508170.
- ^ S2CID 24645055.
- ^ PMID 21459760.
- ^ PMID 15166151.
- S2CID 19566175.
- PMID 28698508.
- ^ Baine, Q.; Looney, C.; Monckton, S. K.; Smith, D. R.; Schiff, N. M.; Goulet, H.; Redford, A. J. (April 2022). "Biology and behavior". idtools.org. Retrieved February 15, 2024.
- PMID 24597216.
External links
- General
- Hymenoptera Anatomy Ontology project
- Hymenoptera Anatomy Glossary
- Hymenoptera Forum German and International
- Hymenoptera of North America – large format reference photographs, descriptions, taxonomy
- International Society of Hymenopterists
- Bees, Wasps and Ants Recording Society (UK)
- Ants Photo Gallery (RU)
- Sphecos Forum for Aculeate Hymenoptera
- Hymenoptera images on MorphBank (a biological image database)
- Order Hymenoptera Insect Life Forms
- Systematics
- Hymenopteran Systematics
- Hymenoptera Online 1000+ images
- Regional Lists
- Insetos do Brasil
- New Zealand Hymenoptera Archived 2007-11-13 at the Wayback Machine
- Waspweb AfrotropicalHymenoptera Excellent images
- checklist of Australian Hymenoptera