Word Finder - antennae

definition

A feeler organ on the head of an insect, crab, or other animal.

definition

An apparatus to receive or transmit electromagnetic waves and convert respectively to or from an electrical signal.

definition

The faculty of intuitive astuteness.

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A fragment of an oligosaccharide

definition

The spar to which a lateen sail is attached, which is then hoisted up the mast.

Arms, tentacles, and antennae stretched for it.

The first antennae are exceptional in branching, if at all, at the third joint.

The antennae are long and thread-like, composed at first of few joints, but the number of these latter apparently increases at each moult.

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.

Spiders on the contrary have no antennae, no separate head," an unsegmented abdomen and an additional pair of legs.

The limbs, including antennae and mouth organs, never exceed seven definite pairs.

In 1892 he distinguished the former as those in which the first antennae of the male have both members modified for holding the female, and the genital openings of the female have a ventral position, sometimes in close proximity, sometimes strongly lateral; the latter as those in which the first antennae of the male are similar to those of the female, the function of holding her being transferred to the male maxillipeds, while the genital openings of the female are dorsal, though at times strongly lateral.

It was then proposed to arrange a detector so that it was affected by the algebraic sum of the two oscillations, and by swivelling round the double receiving antennae to locate the direction of the sending station by finding out when the detector gave the best signal.

In his method three vertical antennae are employed, placed at equidistant distances, and oscillations are created in the three with a certain relative difference of phase.

It is customary to divide the Orthorrhapha into the two divisions Nematocera and Brachycera, in the former of which the antennae are elongate and in a more or less primitive condition, as described above, while in the latter these organs are short, and, as already explained, apparently composed of only three joints.

About twenty-seven species are now known, all characterized by length not excee 4 ding 06 of an inch, flat wings, three articulations in the antennae, one or two articulations in the tarses, with digitules, but without cornicles on the abdomen.

The second antennae, mandibles and two pairs of maxillae may also be claimed as of malacostracan type.

Here the males have one or the other of the first pair of antennae modified into a grasping organ for holding the female.

Little is known of the form of the appendages in the lowest archaic Arachnida, but the tendency of those of the prosomatic somites has been (as in the Crustacea) to pass from a generalized bi-ramose or multi-ramose form to, that of uni-ramose antennae, chelae and walking legs.

The antennae, usually bottle-brush shaped (plumose) in the male sex, are less hairy in the female.

First antennae of male and female almost always articulated alike."

Mayflies and dragon-flies danced in the sunlight; lizards darted across the paths; and legions of spiders pervaded the grass, many very beautiful - frosted - silver backs, or curious, like the saltigrades, who took a few steps and then gave a leap. There were crickets in infinite numbers; and flies innumerable, from slim daddy-long-legs to ponderous, black, hairy fellows known to science as Dejeaniae; hymenopterous insects in profusion, including our old friend the bishop of Ambato (possibly Dielis), in company with another formidable stinger, with chrome antennae, called by the natives ` the Devil '; and occasional Phasmas (caballo de palo) crawling painfully about, like animated twigs."

Other inventors had professed to find a solution of the problem by the use of looped receiving antennae or antennae inclined in various directions.

The antennae of Diptera, which are also extremely important in classification, are thread-like in the more primitive families, such as the Tipulidae (daddy-long-legs), where they consist of a considerable number of joints, all of which except the first two, and sometimes also the last two, are similar in shape; in the more specialized families, such as the Tabanidae (horse-flies), Syrphidae (hover-flies) or Muscidae (house-flies, blue-bottles and their allies), the number of antennal joints is greatly reduced by coalescence, so that the antennae appear to consist of only three joints.

The antennal segment apparently entirely disappears, with the exception of a pair of appendages it bears; these become the antennae; it is possible that the original segment, or some part of it, may even become a portion of the actual antennae.

The fact that the single pair of prae-oral appendages of trilobites, known only as yet in one genus, is in that particular case a pair of uni-ramose antennae - does not render the association of trilobites and Arachnids improbable.

The first antennae have a lamellar appendage at the end of the peduncle, a decidedly non-entomostracan feature.

In this tribe the males have both antennae of the first pair as sensory organs.

Very valuable work in devising forms of antennae for directive radio-telegraphy has been done by MM.

In the latter the single pair of antennae springing up from each side of the camerostome or hypostome or upper lip-lobe are seen.

The second antennae are usually the chief motororgans for swimming, walking and climbing.

The sense organs are eyes, antennae, sensory styles and a statocyst in a few species.

The head is large, the neck slender, the antennae short and the legs longish, and the appearance of the long stalk-like waist of the ant is produced by a patch of whitish hair on each side of the forepart of the abdomen which has the effect of cutting away the parts of the segments so covered, leaving a narrow dark-coloured median area to represent the waist.

It is said that 13,000 such olfactory organs are present on the feeler of a wasp, and 40,000 on the complex antennae of a male cockchafer.

The title " branching horns " alludes to the second antennae, which are two-branched except in the females of Holopedium, with each branch setiferous, composed of only two to four joints.

A third genus, Chonopeltis (Thiele, 1900), has suckers, but has lost its first antennae, at least in the female.

The antennae are short tubular extensions of the body wall, sometimes retractile with a depressed tip from which protrudes a tuft of fine stiff bristles.

The antennae of these weevils are short and end in a knob; those of the Longicorns are very much larger, but the weevil-like look is produced by the presence of a knob-like swelling upon the third joint, the terminal portion of the antenna being so extremely fine as to be almost invisible.

Of the corresponding pairs of appendages thirteen belong to the head and trunk, two pairs of antennae, one pair of mandibles, two pairs of maxillae, followed by three which may be all maxillipeds or may help to swell the number of trunk-legs to which the next five pairs belong.

The sexes in Diptera are usually alike, though in a number of families with short antennae the males are distinguished by the fact that their eyes meet together (or nearly so) on the forehead.

The female is larger than the male and differs from it and the other forms in the last joint of the antennae.

Fleas are wingless insects, with a laterally compressed body, small and indistinctly separated head, and short thick antennae situated in cavities somewhat behind and above the simple eyes, which are always minute and sometimes absent.

Marconi, however, gave in 1906 the first really practical solution of the problem by the use of bent transmitting and receiving antennae.

The eyes are well developed, with numerous facets; the antennae minal one shaped like that of the are transparent, with few nervures, flight.

The first antennae never have more than eight joints.

The Dichelestiidae, on account of their sometimes many-jointed first antennae, are referred also to this tribe by Giesbrecht.

Additional paired antennae may occur within the coronal surface, which is the seat of the sensory styles, of less complex structure, which occur in many genera.

There are also two pairs of distal antennae.

As in all Arachnida there is only a single pair of appendages in front of the mouth, and these were onebranched, long and filiform and acted as antennae.

The resemblance also extends to the general form of the body and to the length and thickness of the wings and antennae.

Similar modification of the antennae in the Longicorn Estigmenida variabilis brings about the resemblance between this beetle and a beetle, Estigmena chinensis, one of the Phytophaga of the family Hispidae.

All insects have the same regional division of the body into head, thorax and abdomen, the same number of legs, a pair of antennae and a segmented abdomen.

Willemoes Suhm, which makes up for its vanished eyes by its extraordinarily elongate and dentated claws; in Psalidopus huxleyi, Wood-Mason and Alcock (1892), bristling with spikes from head to tail; in the Nematocarcinidae, with their long thread-like limbs and longer antennae; in species of Aristaeopsis reported by Chun from deep water off the east coast of Africa, bright red prawns nearly a foot long, with antennae about five times the length of the body.

Only in the male do the second antennae attain considerable length, with strong resemblance to what is found in some of the Amphipoda.

All the known forms of plant-life are either fungi or allied to them, and many are only microscopic. The most interesting inhabitants of Mammoth Cave are the blind, wingless grasshoppers, with extremely long antennae; blind, colourless crayfish (Cambarus pellucidus, Telk.); and the blind fish, Amblyopsis spelaeus, colourless and viviparous, from 1 in.