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| HYMENOPTERA   [Latest Classification]  Please refer to the following links for
  details on this groups:        
  Hymenoptera = Photos-1,  Photos-2               Description & Behavior    Principal Families    References     Description & Behavior            
  Hymenoptera is one of the largest orders of insects that includes the
  sawflies, wasps, bees, and ants. There are over 130,056 identified
  species.  The name relates to the
  heavy wings of the insects, and comes from the Greek for hymen membrane and pteron
  for wing. The hindwings are connected to the forewings by a series of hooks
  called hamuli.            
  Females usually have a special ovipositor for inserting eggs into
  hosts or otherwise remote places. The ovipositor also is usually modified
  into a stinger. The immatures develop through complete metamorphosis with a
  worm-like larval stage and an inactive pupal stage before they mature.             The
  order dates from the Triassic, the oldest fossils belonging to the family
  Xyelidae. Social hymenopterans first appeared during the Cretaceous. The
  evolution of this group has been intensively studied by A. Rasnitsyn, M. S.
  Engel, G. Dlussky (see References).               The
  size ranges from medium to large, usually with two pairs of wings. The  mouthparts are for chewing, with
  well-developed mandibles. Many species have further developed the mouthparts
  into a lengthy proboscis, with which they can imbibe liquids, such as nectar.
  They have large compound eyes, and usually three ocelli.             The
  forward margin of the hindwing bears a number of hooked bristles, or
  "hamuli", which lock onto the forewing, holding them 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 very  tightly. The wings have
  few veins compared with many other insects, especially in the smaller
  species.             In the
  more primitive species, the ovipositor takes the shape of a blade, and has
  adapted to slicing plant tissues. However most species have it modified for
  piercing, and, in some cases, is several times the length of the body. The
  ovipositor may also 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 for
  boring and  to inject venom. The
  stinger is used to immobilise prey, but in some wasps and bees may be used
  for defence.             The
  larvae of the primitive species resemble caterpillars, and like them, they
  feed on leaves. They have large chewing mandibles, three thoracic limbs, and
  usually a number of abdominal prolegs. But unlike caterpillars, the prolegs
  have no grasping spines, and the antennae are greatly reduced.            
  The larvae of other Hymenoptera more closely resemble maggots, and are
  adapted to life in a protected environment. This may be the body of a host,
  or a cell in a nest, where the adults will care for the larva (e.g.,
  Bethylidae). Such larvae have soft bodies with no limbs. Defecation occurs
  when they reach adulthood due to having an incomplete digestive tract,
  probably to avoid contaminating their surroundings.             Sex is
  determined by the number of chromosomes that an insect has.  Fertilized eggs receive two sets.
  chromosomes (one from each parent's respective gametes), and so develop into diploid
  females, while unfertilized eggs only contain one set (from the mother), and
  so develop into haploid males; the act of fertilization is under the
  voluntary control of the egg-laying female, a process that is known as
  haplodiploidy.             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. 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 into a male. This is
  common in an individual whose parents were siblings or other close relatives.
  Diploid males are known to be produced by inbreeding in ants, bees and wasps.             One
  result 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
  may contribute to the multiple origins of eusociality within this order.
  Different species show a wide range of feeding habits. The most primitive
  forms are usually herbivorous, feeding on leaves or pine needles. Stinging
  wasps are predators, and will provide their larvae with immobilised prey,
  while bees feed on nectar and pollen             Quite
  a few species are parasitoids as larvae. The adults inject the eggs into a
  paralysed host, which the larvae begin to consume after hatching. Some
  species are even hyperparasitoids, with the host itself being another
  parasitoid insect. Habits intermediate between those of the herbivorous and
  parasitoid forms occur in some species that inhabit the galls or nests of
  other insects, utilizing their food, and even killing and devouring the
  occupant.             The
  suborder Symphyta includes the sawflies, horntails, and parasitic wood wasps.
  The group may be paraphyletic, as it has been thought that the family
  Orussidae may be the ancestral group of the Apocrita. They have an
  unconstricted junction between the thorax and abdomen, and the larvae of
  free-living forms are herbivorous, have legs, prolegs (on every segment,
  unlike Lepidoptera and ocelli.  The
  wasps, bees, and ants together make up the suborder Apocrita, characterized
  by a constriction between the first and second abdominal segments called a
  petiole, that also involves the fusion of the firs abdominal segment to the
  thorax. Also, the larvae of all Apocrita do not have legs, prolegs, or ocelli   Principal Families & Subfamilies   
   References:   Please refer to  <biology.ref.htm>, [Additional references
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  Nostrand Reinold, New York, USA. 850 pp.   Berland, L., and F. Bernard. 1951a. Hymenopteroides
  (Symphytes et Terebrants). Pages 771‑975 in Grasse, P.‑P. Traite de zoologie, anatomie,
  systematique, biologie. Tome X. Insectes superieurs et hemipteroides (Premier fascicule).
  Masson, Paris, France. 975 pp.   Berland, L., and F. Bernard. 1951b. Hymenopteroides
  (Aculeates). Pages 976‑1276, in Grasse, P.‑P. Traite de zoologie, anatomie,
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  1958a. Atlas des Hymenopteres de France,
  Belgique, Suisse. I. Tenthredes, Parasites, Porte‑aiguillon
  (Bethylides). Nouvel Atlas d'Entomologie. Editions N. Boubee, Paris, France. 155 pp.   Berland, L.
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