The Australian fauna is rich in characteristic and peculiar genera, and New Zealand, while possessing some remarkable insects of its own, lacks entirely several families with an almost world-wide range - for example, the Notodontidae, Lasiocampidae, and other families of Lepidoptera. Galeodes has been made the means of a comparison between the structure of the Arachnida and Hexapod insects by Haeckel and other writers, and it was at one time suggested that there was a genetic affinity between the two groups - through Galeodes, or extinct forms similar to it. We use the model of a 1.4 paragraph, which includes a main idea, detail, example/explanation, and a wrap-up sentence. Ent. Linnaeus in his Systema naturae (1735) grouped under the class Insecta all segmented animals with firm exoskeleton and jointed limbs - that is to say, the insects, centipedes, millipedes, crustaceans, spiders, scorpions and their allies. - We have al 17 ready seen that in numerous lower insects the abdomen 18 is formed from twelve divi 19 sions placed in linear fashion. How to use insect in a sentence. ... More than 1 million of the categorized 2 million species are arthropods (insects/spiders). (3) That birds may also be deceived by insects that mimic those they have found to be uneatable has been shown by the abovequoted experiment with the drone-fly and the honey-bees made by Professor Lloyd Morgan. The occurrence of weevils - among the most specialized of the Coleoptera - in Triassic rocks shows us that this great order of metabolous insects had become differentiated into its leading families at the dawn of the Mesozoic era, and that we must go far back into the Palaeozoic for the origin of the Endopterygota. These experiments have shown that Arthropods also have their likes and dislikes in the matter of insect-food and frequently refuse to eat insects which are warningly coloured and are distasteful to vertebrated enemies. -Of especial value to students of these insects are A. Pollination is effected by aid of insects. In insects so widely separated as bristle-tails and moths this occurs occasionally. Voir plus d'idées sur le thème animaux, animaux insectes, imagier animaux. The compound eyes of insects resemble so closely the similar organs in Crustaceans that there can hardly be reasonable doubt of their homology, and the primitively appendicular nature of the eyes in the latter class suggests that in the Hexapoda also they represent the appendages of an anterior (protocerebral) segment. In generalized biting insects, such as cockroaches and locusts (Orthoptera), the parts of a typical maxilla can be easily recognized in the labium. The book-lice are familiar wingless insects, often found in houses running about among old papers and neglected biological collections. In recent years classifications in part agreeing with the older schemes but largely original, in accord with researches on the comparative anatomy of the insects, have been put forward. Insects, examples and characteristics of which we will present today, are the most numerous group of all creatures inhabiting our planet. TpoxiXos), the small bird that according to Herodotus waits or attends on the crocodile and picks insects out of his teeth. During recent years the study of fossil insects (palaeoentomology) has attracted much attention. Houses have been cleared of bugs after being thoroughly fumigated with brimstone. This consideration leads us to one of the most remarkable and fascinating features of 'ant-communities - the presence in the nests of insects and other small arthropods, which are tended and cared for by the ants as their " guests," rendering to the ants in return the sweet food which they desire. The development of such diversely-formed insects as the offspring of the unmodified females which show none of their peculiarities raises many points of difficulty for students in heredity. These minute insects are found amongst old books and furniture. Kolbe, on the other hand, insists that the weevils are the most modified of all beetles, being highly specialized as regards their adult structure, and developing from legless maggots exceedingly different from the adult; he regards the Adephaga, with their active armoured larvae with two foot-claws, as the most primitive group of beetles, and there can be little doubt that the likeness between larvae and adult may safely be accepted as a primitive character among insects. In the structure of the digestive system, beetles resemble most other mandibulate insects, the food-canal consisting of gullet, crop, gizzard, mid-gut or stomach, intestine and rectum. SILK, a fibrous substance produced by many insects, principally in the form of a cocoon or covering within which the creatures are enclosed and protected during the period of their principal transformations. definition 1: a small animal whose body is divided into three parts. There are three in every four animals! Although one of the characteristics of insects is the brevity of their adult lives, a considerable number of exceptions to the general rule have been discovered. Though his researches were not conducted on any definite scientific plan, his powers of careful observation enabled him to make many interesting discoveries in the minute anatomy of man, the higher animals and insects. Schwangart, who has studied (1904) the embryonic insects, twenty-one of these divisions - not, however, all similar - development of Lepidoptera. In insects of the order Orthoptera, departure from the normal in form and colour, carrying with it similarity to other living things, usually takes the line of protective resemblance to parts of plants. Several Silurian fossils have been identified as insects, including a Thysanuran from North America, but upon these considerable doubt has been cast. His order of wingless insects (Aptera) included Crustacea, spiders, centipedes and other creatures that now form classes of the Arthropoda distinct from the Hexapoda; it also included Hexapoda of parasitic and evidently degraded structure, that are now regarded as allied more or less closely to various winged insects. Many insects have aquatic larvae, some of which take in atmospheric air at intervals, while others breathe dissolved air by means of tracheal gills. Exoskeleton The outer cellular layer (ectoderm or " hypodermis ") of insects as of other Arthropods, secretes a chitinous cuticle which has to be periodically shed and renewed during the growth of the animal. The insects are the largest class in the animal world, outnumbering all other animals. These insects are able, therefore, to bite as well as to suck, whereas most insects which have acquired the power of suction have lost that of biting. Lintner extend from 1882 to 1898, in yearly parts, under the title of Reports on the Injurious Insects of the State of New York. Dictionary ... For the class of the true insects included in this phylum, Linnaeus's old term Insecta, first used in a restricted sense by M. 0. years; (2) certain stages of the life that are naturally " resting stages " may be in exceptional cases prolonged, and that to a very great extent; in this case no food is taken, and the activity of the individual is almost nil; (3) the life of certain insects in the adult state may be much prolonged if celibacy be maintained; a female of Cybister roeselii (a large water-beetle) has lived five and a half years in the adult state in captivity. Thus, wasps catch flies; worker ants make raids and carry off weak insects of many kinds; bees gather nectar from flowers and transform it into honey within their stomachs - largely for the sake of feeding the larvae in the nest. The beetles are elegant insects with long, slender legs, running quickly, and flying in the sunshine. Vos élèves travailleront la structure de la phrase tout en améliorant leur vocabulaire! He scratched the insect bite on his leg. The insects appeared quickly to revert to natural conditions; the moths brought out in open air were strongly marked, lively and active, and eggs left on the trees stood the severity of the winter well, and hatched out successfully in the following season. These insects are often found in large numbers on plants whose juices they suck. The changes in colour and structure required to complete the resemblance to particular species are comparatively slight and much less complicated than those needed to produce a likeness to other protected insects. Did You Know? These insects are universally aquatic in their preparatory states. The insects retained in the order Neuroptera as restricted by modern systematists are distinguished from the preceding orders by the presence of a resting pupal stage in the life-history, so that a " complete metamorphosis " is undergone. Example sentences with the word insects. the bionomic nature of metamorphosis, and to what extent it existed in primitive insects. How to use insect in a sentence. that portion of the gut which is formed by the hypoblast, whereas in Hexapod insects the similar caecal tubes are developed from the proctodaeum or in -pushed portion of the gut which is formed from epiblast. Besides the aphids, other insects, such as scale insects (Coccidae), caterpillars of blue butterflies (Lycaenidae), and numerous beetles, furnish the ants with nutrient secretions. Of insects there are relatively few kinds; but ants, beetles and mosquitoes abound. The thorax is composed of three segments; each bears a pair of jointed legs, and in the vast majority of insects the two hindmost bear each a pair of wings. After the determination of a number of cosmopolitan insects that may well have been artificially introduced, there remains a large proportion of endemic species - sometimes referable to distinct genera - which suggest a high antiquity for the truly insular faunas. Orthoptera is the class that contains insects like grasshoppers and katydids. Again, galls may afford harbour to insects which are not essentially gall-feeders, as in the case of the Curculio beetle Conotrachelius nenuphar, Hbst., of which one brood eats the fleshy part of the plum and peach, and another lives in the " black knot " of the plum-tree, regarded by Walsh as probably a true cecidomyidous gall. Insect life is ricn in northern Melanesia; in southern Melanesia it is less so; in Fiji numerous kinds of insects occur, while individual numbers are small. The first hypothesis is not negatived by direct evidence, for we do not actually know the ontogeny of any of the Palaeozoic insects; it is, however, rendered highly improbable by the modern views as to the nature and origin of wings in insects, and by the fact that the Endopterygota include none of the lower existing forms of insects. It is now, in fact, generally admitted that metamorphosis has been acquired comparatively recently, and Scudder in his review of the earliest fossil insects states that " their metamorphoses were simple and incomplete, the young leaving the egg with the form of the parent, but without wings, the assumption of which required no quiescent stage before maturity.". The destruction of considerable portions of the forests by cattle, goats, insects, fire and cutting has been followed by reforesting, the planting of hitherto barren tracts, the passage of severe forest fire laws, and the establishment of forest reserves, of which the area in 1909 was 545,746 acres, of which 357,180 were government land. Fertilization is effected by insects, especially by bees, which are directed in their search by the colour and fragrance of the flowers; but some pollen must also be transported by the wind to the female flowers, especially in arctic species which, in spite of the poverty of insect life, set abundant fruit. Ephemeridae belong to a very ancient type of insects, and fossil imprints of allied forms occur even in the Devonian and Carboniferous formations. The most important work in this direction has been done by Fritz Muller (Filr Darwin), by Herman Muller (Fertilization of Plants by Insects), Grade b. This has been found to be the case in insects so widely different as Orthoptera and Aculeate Hymenoptera. (For the habits of these insects see Wasp.) In the absence of the external ectodermal ducts usual in winged insects, these two groups resemble therefore the primitive Aptera. The Naucoridae and Belostomatidae are flattened insects, with four-segmented feelers and fore-legs inserted at the front of the prosternum. These ancient Exopterygota were synthetic in type, and included insects that may, with probability, be regarded as ancestral to most of the existing orders. It is invariably the result of some cause acting generally, such as renal disease, valvular defect of the heart, or an impoverished state of the blood; while a mere oedema is usually dependent upon some local obstruction to the return of blood or lymph, or of both, the presence of parasites within the tissue, such as the filaria sanguinis hominis or trichina spiralis, or the poisonous bites of insects. An insect is a class of small arthropod animals that has three separate sections to their bodies;head,thorax,abdomen. The views of Adler as to the alternation of generations of numerous gall-flies have been fully confirmed, it having been ascertained by direct observation that the galls and the insects produced from them in one generation are entirely different from the next generation; and it has also been rendered certain that frequently one of the alternate generations is parthenogenetic, no males being produced. The overall study of insects … Singular and Plural Noun with Verbs grade-1. See Neuroptera, among which these insects were formerly comprised. All insects share some common traits: six legs, antennae, and a segmented body that is divided into three sections: the head, thorax, and abdomen. The suggested causes are (I) reduction of insects by drainage, (2) reduced population, (3) the use of quinine. In insects whose mouths are adapted for sucking and piercing, remarkable modifications may occur. Example sentences with the word insect. Both head and trunk are somewhat flattened dorso-ventrally, giving the insects a very distinct and characteristic aspect. Dictionary ... A true insect, or member of the class Hexapoda, may be known by the grouping of its body-segments in three distinct regions - a head, a thorax and an abdomen - each of which consists of a definite number of segments. In insects of active flight on of Air-Tubes e ra Portion the tubes swell out into numerous Magnified 2 2 times. Hence the muscular power of insects is enormous. The Elasmobranchs swallow infected molluscs or fish; pike and trout devour smaller fry; birds pick up sticklebacks, insects and worms which contain Cestode larvae; and man lays himself open to infection by eating the uncooked or partially prepared flesh of many animals. As shown by the number and variety of species, the Orthoptera are the most dominant order of this group. Brauer, that the Thysanura represent more nearly than any other existing insects the ancestors of the class, has been accepted by the great majority of students. Dictionary ! The Lepidoptera furnish more instances of mimicry, both Batesian and Mullerian, than any other order of insects. Other flies of the genus Volucella, larger and heavier in build than Eristalis, resemble humble-bees in colour and form, and it was formerly supposed that the purpose of this similarity was to enable the flies to enter with impunity the nests of the humble-bees and to lay their eggs amongst those of the latter insects. Tags: EVS – Class 1/Grade1 – CBSE – Chapter – Animal Around Us ... Insects - Animal that has six legs and generally one or two pairs of wings are called insects. (From Lankester, " Limulus and Arachnid.") It is this peculiar " waist " that catches the eye of the observer, and makes the insects so easy of recognition. To preserve from insects, the plants, after mounting, are often brushed over with a liquid formed by the solution of lb. Galls are formed also by hemipterous and homopterous insects of the families Tingidae, Psyllidae, Coccidae and Aphidae. These insects pass the pupal stage in the ground, and reach the boughs to lay their eggs by crawling up the trunks of the trees. We have many activities and games such as memory cards, vocabulary exercises and puzzles to teach you names of the insects. The addition of brilliant ornamentation in shell, teeth, feathers, wings of insects and dyed fibres completed the round of the textile art. On account of their work in destroying plant-eating insects, the ichneumonflies are of great economic importance. They are relatively shorter and broader insects than the Embiidae with large prothorax and long wings, which have a transverse line of weakness at the base and are usually shed after the nuptial flight. I was never still a moment; my life was as full of motion as those little insects that crowd a whole existence into one brief day. They are small insects, having straight antennae, and a compressed, usually very short abdomen with the second or second and third segments greatly developed, and the rest imbricated, and concealing the partially coiled ovipositor. and the Gryllidae or crickets (q.v.). This exemplar solution covers answers to the questions on the condition of forests in our country, their importance and effect of forest depletion and the reason behind that. The insects visit the plant in large numbers, attracted by the foetid smell, and act as carriers of the pollen from one spathe to another. These descriptive names are highly poetic, as also that of the Portuguese, " beija-flor " (flower-kisser); but the humming-bird is insectivorous, and thrusts his long bill into flowers in search of insects instead of honey. They are remarkable for the possession of complex ears (described in the article Hexapoda) anti From Carpenter's Insects. Under such conditions the deeply-rooted nature of the blood-sucking instinct is most remarkable; for insects whose ancestors for many generations may not have tasted blood will seek for it with the utmost keenness and pertinacity so soon as an opportunity presents itself. Class Insects: Examples, Species, Features. Needham, &c., Aquatic Insects in New York State (Albany, N.Y., 1903); F. The Egyptians did not stop at the mummification of the human body; sacred animals, birds, reptiles, fishes, and even insects were treated in a similar way, and the meat offerings deposited with the wealthy dead were likewise "preserved.". 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