What are beetles? |
---|
by Dr. Lawrence Kaplan. Source : http://www.coleoptera.org/p1058.htm |
Beetles or Coleoptera are one of approximately 30 orders of the class of Insecta. The Order of Coleoptera is in many respects sharply distinguished from other insects and is the favourite subject of study of both, professional scientists and naturalists. The beetles are the largest order including more species known to science than any other order not only in the Class of Insecta, but also in the entire animal kingdom (Animalia). The most authoritative calculations indicate that already now more than 350,000 species of beetles have been described. Every year approximately 2000 new species are described (Zoological Record). Taking into account that the entire fauna of the earth is considered to include approximately 1,400,000 species it can be stated that beetles constitute more than a quarter of all known animals. Moreover, recent attempts of total collections of insects from several species of tropical trees in the basin of the Amazon River have shown that 50% of beetles found by this method are new (Erwin, 1982; 1997). Faunae from different species of trees are so very different from one another that it is possible to predict discovery of several hundreds of thousands or even millions of beetle species and according to some evaluations up to 7 million species. Beetles are most abundant in the tropics; but at the same time they have got adapted to life at all latitudes and in nearly every habitat, to feeding on any substances of organic origin. Therefore, beetles are nearly ubiquitous. They have not been found on the Antarctic Continent yet, but inhabit the subantarctic islands, they have not been found in the open sea, but are abundant on sea coasts, they have not been found beyond the boundary of eternal snows, but very interesting species of beetles occur high in the mountains in the summer immediately close to this boundary. Many species of beetles attain large numbers. The above explains why the beetles are so well known. Beetles, as well as cats, dogs and birds are the first animals that a small child who begins to talk, learns to recognize. Beetles are extremely diverse not only in size and colour, but also in body shape, sculpture of external cover, presence of various outgrowths, etc. Butterflies probably excel beetles in the splendour of colours, however, beetles have no match in the fantastic diversity of forms. Therefore beetles are an inexhaustible source of inspiration for writers, sculptors, artists, ornamenters and pattern-designers. Perhaps for this reason and also due to the extreme simplicity of storage of dead specimens beetles are a favourite object of collecting. Many species of beetles are serious pests of agriculture and forestry, stored food, wood, leathers, furs, fabric. Other species, vice versa, are disturbed as a result of man's economic activity; they are permanently declining in numbers or become extinct. Some common species of beetles respond sensitively to the state of natural environment and may serve as convenient indicators of anthropogenic pollution. Therefore, knowledge of beetles is indispensable not only to professional zoologists, but also to plant protection specialists, agriculturists, arboriculturists, museum specialists and workers of food processing industry, ecologists, staff of reserves and specialists in many other areas. All insects are studied by a special field of zoology - entomology. The study of beetles in its turn has long ago become a separate branch of entomology, coleopterology. Accordingly, specialists studying beetles are called coleopterists. At the Zoological Institute of the Russian Academy of Sciences (hereinafter referred to as ZIN) coleopterology has long and famous traditions. Coleopterological study conducted at ZIN is based upon the Institute's collection containing now not less than 6 million of specimens. The collection was started as early as 1714 by Peter the Great when the Kunstkammer was established. A jump in the development of study of beetles is associated with to the name of E. Menetries, a world-famous entomologist . After him a series of prominent coleopterists including A.F. Moravitz, A.P. Semenov-Tian-Shansky, G.G. Jacobson, A.N. Reichardt, A.A. Richter, E.L. Gurjeva, M.E. Ter-Minasian, and O.L. Kryzhanovsky worked at ZIN. Source : http://www.zin.ru/ANIMALIA/COLEOPTERA/eng/intro.htm |
Beetle ( Coleoptera )
Classification Of Bugs
Class | Main Body Region | Pairs Of Legs | Pairs Of Antenna | Wings |
---|---|---|---|---|
Crustacea | two - cephalothorax* and abdomen (some with head and trunk | five or more | two | absent |
Myriaopoda | two - head and trunk | many - one or two per trunk segment | one | absent |
Arachnid | two - cephalothorax* and abdomen | four | none (though palps may resemble antennae or legs) | absent |
Insecta | three - head, thorax and abdomen | three | one | usually present (but many wingless form) |
Each of the Classes of arthropods, including the insects are split into a number of smaller groups, which reflect progressively more detailed structural similarities between the group member. These smaller groups follow a strict hierarchy. The major class division in descending order of size are called Subclass, Order, Suborder, Family, Subfamily and Genus. A Genus is the smallest group of any real importance in the naming of individual species, although in some classifications generic groups may be further spllit into Subgenera. The scientific name of a species includes, first, the Genus to which it belongs and, second, its specific name, e.g. the European Violet Ground Beetle is called Carabus violaceus, meaning the species violaceus in the Genus Carabus (by convention, generic and specific names are always printed in italics; the generic name spelt with a capital letter and the specific name with a smaller letter). The full classification of insect would be as follow :
PHYLUM : | Arthropoda | arthropod |
CLASS : | Insecta | insect |
SUBCLASS : | Pterygota | winged insect |
ORDER : | Coleoptera | beetle |
SUBORDER : | Adephaga | carnivorous beetle |
FAMILY : | Carabidae | ground beetle |
SUBFAMILY : | Carabinae | - |
GENUS : | Carabus | - |
SPECIES : | Carabus violaceus L. | violet ground beetle |
ORDER | COMMON NAME |
---|---|
1. Branchiopoda | Water Fleas (Daphnia), Fairy, Brine, Tadpole, and Clam Shrimps |
2. Copepoda | Water Fleas (Cyclops), Fish Lice, Gill Maggots and Anchor Worms |
3. Ostracoda | Seed Shrimps |
4. Cirrepedia | Barnacles |
5. Stomatopoda | Mantis Shrimps |
6. Mysidacea | Opossum Shrimps |
7. Decapoda | Shrimps, Prawns, Lobsters, Crayfish and Crabs |
8. Amphipoda | Freshwater Shrimps (Gammarus) and Sand Hoppers |
9. Isopoda | Sea Slatters, Water Slatters, Water Lice and Hog Lice |
Isopoda: Oniscoidea (part) | Woodlice |
Class Myriapoda
ORDER | COMMON NAME |
---|---|
1. Pauropoda | - |
2. Symphylia | - |
3. Diplopoda | Millipedes |
4. Chilopoda | - |
Class Arachnid
ORDER | COMMON NAME |
---|---|
1. Xiphosura | King Crabs or Horseshoe Crabs |
2. Pseudoscorpiones (=Chernetidae) | Pseudoscorpions or False Scorpions |
3. Scorpionidae | Scorpions |
4. Pedipalpi | Whip Scorpions |
5. Solifuga (=Solpugae) | Wind Scorpions or Barrel Spiders |
6. Opiliones (=Phalangidae) | Harvestmen or Harvest Spiders |
7. Acari (=Acarina) | Mites and Ticks |
8. Araneae | True Spiders |
ORDER | COMMON NAME | SUBCLASSES & FEATURES |
1. Thysanura | Bristletails | APTERYGOTA These are wingless insects and their body structure suggests that they never had wings during their evolutionary history. Young stages resemble the adults – little or no metamorphosis |
2. Diplura | Two-pronged Bristletails | |
3. Protura | - | |
4. Collembola | Springtails | |
5. Ephemeroptera | Mayflies | PTERYGOTA Division EXOPTERYGOTA These are winged insects, although some have lost their wings during the course of evolution. When present, the wing develop externally and there is no marked change (metamorphosis) during the life cycle. The young stages, called nymph, resemble the adult except in seze and in lacking fully-developed wings – simply metamorphosis. |
6. Odonata | Dragonflies | |
7. Plecoptera | Stoneflies | |
8. Grylloblattodea | - | |
9. Orthroptera | Crickets, Grasshoppers and Locusts | |
10. Phasmida | Stick and Leaf Insects | |
11. Dermaptera | Earwings | |
12. Embioptera | Web-spinners | |
13. Dictyoptera | Cockroaches and Mantids | |
14. Isoptera | Termites | |
15. Zoraptera | - | |
16. Psocoptera | Psocids and Booklice | |
17. Mallophaga | Biting Lice | |
18. Siphunculata (=Anoplura) | Sucking Lice | |
19. Hemiptera | True Bugs | |
20. Thysanoptera | Thrips | |
21. Neuroptera | Alder Flies, Snake Flies and Lacewings | PTERYGOTA Division ENDOPTERYGOTA These are winged insects, although some have lost their wings during the course of evolution. When present, the wings develop internally (i.e. inside the body of the immature insect) and there is a marked change (metamorphosis) during the life cycle. The young stages are very different from the adults and are called larvae. The change from larva to adult takes place during a non-feeding stage called the pupa (or chrysalis) – complex metamorphosis. |
22. Coleoptera | Beetles | |
23. Strepsiptera | Stylopids | |
24. Mecoptera | Scorpion Flies | |
25. Shiponaptera | Flea | |
26. Diptera | True Flies | |
27. Lepidoptera | Butterflies and Moths | |
28. Tricoptera | Caddis Flies | |
29. Hymenoptera | Bees, Wasps and Ants |
Thanks to Dr David Kendall BSc PhD