Word Finder - parasitic

definition

A component of a circuit that does not show up in a circuit's schematic but does show up in the circuit's behavior.

definition

Of or pertaining to a biological or symbolic parasite.

definition

Drawing upon another organism for sustenance.

definition

Exploiting another for personal gain.

The parasitic cycle has been broken, and the insect is no longer infected.

Oxen, sheep, dogs, monkeys, bats, and probably horses also suffer from similar parasitic diseases.

The Nematoda which are parasitic during their whole life may similarly be divided into two classes - those which undergo their development in a single host, and those which undergo their development in the bodies of two distinct hosts.

With regard to the parasites, which are the actual cause of malaria in man, an account of them is given under the heading of Parasitic Diseases, and little need be said about them here.

The parasitic and free-living Nematodes are connected by transitional forms which are free at one stage of their existence and parasitic at another; they may be divided into two classes those that are parasitic in the larval state but free when adult, and those that are free in the larval state but parasitic when adult.

Its over-supply is, however, a frequent cause of predisposition to the attacks of parasitic Fungie.g.

The growth of the parasitic larva does not stop the development of the host-larva, and when the latter pupates and assumes the winged form, the stylopid, which has completed its transformation, is carried to the outer world.

Other genera of the family are parasitic on Hemiptera - bugs and frog-hoppers - but nothing is known as to the details of their life-history.

Short of suppressing mosquitoes, the parasitic cycle may theoretically be broken by preventing them from giving the infection to man or taking it from him.

In modern countries it takes myriads of forms, from the sweating of parasitic trades to the organization of scientific research.

Entocolax, mouth at free extremity, animal fixed by aboral orifice of pseudopallium, Pacific. Entoconcha, body elongated and tubular, animal fixed by the oral extremity, protandric hermaphrodite, parasitic in testes of Holothurians causing their abortion.

In some parasitic Hymenoptera there is only a single the proctodaeum respectively.

These later stages, comprising the greater part of the larval history, are adapted for an inquiline or a parasitic life, where shelter is assured and food abundant, while the short-lived, active condition enables the newly-hatched insect to make its way to the spot favourable for its future development, clinging, for example, in the case of an oil-beetle's larva, to the hairs of a bee as she flies towards her nest.

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.

Sharp's proposed association of the parasitic wingless insects in a group Anapterygota cannot, however, be defended as natural; and recent researches into the structure of these forms enables us to associate them confidently with related winged orders.

Includes the beetles and the parasitic Stylopidae, often regarded as a distinct order (Strepsiptera).

The Corrodentia retain vestigial maxillulae and two pairs of Malpighian tubes, but the wings are somewhat specialized in the Copeognatha and absent in the degraded and parasitic Mallophaga.

Filamentous diatoms may be mounted like ordinary seaweeds, and, as well as all parasitic algae, should whenever possible be allowed to remain attached to a portion of the alga on which they grow, some species being almost always found found parasitical on particular plants.

The jagaey (Ficus sp.), which stifles in its giant coils the greatest trees of the forest, and the copei (Clusia rosea) are remarkable parasitic lianas.

Many Acari are parasitic on marine and freshwater molluscs, and others are found on the feathers of birds and the hair of mammals.

There are few manufacturing industries in Venezuela, and these usually of the parasitic type, created by official favour and protected by high tariffs on imports in competition.

The parasitic hypothesis postulates the invasion of a parasite from without, thus making a new growth an infective process.

In this may be found the germ of the startling modern discoveries in parasitic diseases.

This order is almost exclusively parasitic in warm-blooded animals.

They are flattened organisms provided with two or more suckers, hence their name (7 rpThµarc,8rls, pierced with holes), and are exclusively parasitic both in their earlier and mature stages of life.

Comparatively only a few species are, for part of their lives, denizens of fresh water; these, as larvae, are parasitic on the eggs or larvae of other aquatic insects, the little hymenopteron, Polynema natans, one of the " fairy-flies " - swims through the water by strokes of her delicate wings in search of a dragon-fly's egg in which to lay her own egg, while the rare Agriotypus dives after the case of a caddis-worm.

It is of interest that the waters have been invaded by the parasitic group of the Hymenoptera, since in number of species this is by far the largest of the order.

Not a few cases are known in which a parasitic larva is itself pierced by the ovipositor of a " hyperparasite," and even the offspring of the latter may itself fall a victim to the attack of a " tertiary parasite."

In the Chalcidoidea, Ichneumonoidea and Proctotrypoidea will be found nearly all the " parasitic Hymenoptera " of older classifications.

The vast majority of this group, including nearly 5000 known species, are usually reckoned as a single family, the Chalcididae, comprising small insects, often of bright metallic colours, whose larvae are parasitic in insects of various orders.

They are among the most minute of all insects and their larvae are probably all parasitic in insects' eggs.

All the other members of the group may be regarded as forming a single family - the Proctotrypidae, including an immense number of small parasitic Hymenoptera, not a few of which are wingless.

The Trigonalidae, a small family whose larvae are parasitic in wasps' nests, also probably belong here.

The Sapygidae are parasitic on bees, while the Scoliidae are large, robust and hairy insects, many of which prey upon the grubs of chafers.

Lilies are, under certain conditions favourable to the development of the disease, liable to the attacks of three parasitic fungi.

Among the numerous insects parasitic on the inhabitants of galls are hymenopterous flies of the family Proctotrypidae, and of the family Chalcididae, e.g.

This term was introduced by Thorell in 1864 for the Argulidae, a family which had been transferred to the Branchiopoda by Zenker in 1854, though sometimes before and since united with the parasitic Copepoda.

The Ascidicolidae have variable characters, showing a gradual adaptation to parasitic life in Tunicates.

A medusa with a remarkable habit of life is Mnestra parasites, which is parasitic on the pelagic mollusc Phyllirrhoe, attaching itself to the host by its subumbral surface; its tentacles, no longer required for obtaining food, have become rudimentary.

A parasitic mode of life is also seen in medusae of the genus Cunina during the larval condition, but the habit is abandoned, in this case, when the medusae become adult.

All known species are parasitic on the Crustacean Nebalia; Seison Claus; Paraseison Plate.

The Planarians are free-living animals, the Trematodes are parasitic upon and within animals, and the Cestodes are wholly endoparasitic.

Their adaptations to parasitic life in vertebrate animals appear to have involved such modifications of structure and development that their affinities are quite problematical.

Nevertheless, as explained below, it seems to be highly probable that ant-imitating insects and spiders, when the resemblance is dependent to a greater extent upon size, shape and movement than upon tint, have acquired their mimetic likeness especially to protect them from the attacks of such insect-enemies as predaceous wasps of the family Pompilidae, flies of the family Asilidae, and from socalled parasitic hymenoptera of the family Ichneumonidae, as well as from other insect-eating Arthropods.

There are records, however, of species of Mantispa mimicking the wasp Polistes in North America and Borneo and Belonogaster in South Africa; and other species of the genus imitate parasitic hymenoptera of the genera Bracon and Mesostenus.

Another instance in this group is supplied by a Bornean species of Reduviidae which mimics a species of the genus Bracon, one of the parasitic Hymenoptera.

In 1865 De Bary suggested the possibility that such lichens as Collema, Ephebe, &c., arose as a result of the attack of parasitic Ascomycetes upon the algae, Nostoc, Chroococcus, &c. In 1867 the observations of Famintzin and Baranetzky showed that the gonidia, in certain cases, were able to live outside the lichen-thallus, and in the case of Physcia, Evernia and Cladonia were able to form zoospores.

In 1869 Schwendener put forward the really illuminating view - exactly opposite to that of Baranetzkythat the gonidia in all cases were algae which had been attacked by parasitic fungi.

The lichen algae are not alone in their specializa tion to the symbiotic (or parasitic) mode of life, for, as stated earlier, the fungus appear in the majority of cases to have completely lost the power of independent development since with very rare exceptions they are not found alone.

Moreover, although the green portions of the flower do indeed perform the same office as the leaves, the more highly coloured and more specialized portions, which are further removed from the typical leaf-form, do not carry on those processes for which the presence of chlorophyll is essential; and the floral organs may, therefore, in a rough sense, be said to be parasitic upon the green parts.