A very curious function sometimes discharged by the antennules or antennae of Decapods is that of forming a respiratory siphon in sand-burrowing species.
This modification is usually only found in the antennules and antennae, but it may exceptionally be found in the appendages of the trunk, as, for instance, in the thoracic legs of some Decapods (e.
In nearly all Crustacea the antennules and often also the antennae bear groups of hair-like filaments in which the chitinous cuticle is extremely delicate and which do not taper to a point but end bluntly.
These may be formed by the modification of almost any of the appendages, often the antennules or antennae or some of the thoracic limbs, or even the mandibular palps (some Ostracoda).
In the great majority of Crustacea the antennules are purely sensory in function and carry numerous "olfactory" hairs.
The antennules are uniramous, the others biramous, and all three pairs are used in swimming.
Through the valves of the shell a pair of large compound eyes can be seen, as well as six pairs of two-branched swimming feet, while in front a pair of antennules project between the valves.
There are two pairs of swimming limbs, each with endopodite and exopodite, and the short antennules and antennae are seen on either side of the rostrum.
It whips the water with its antennules in a staccato fashion, and feels about with the antennae and chelae, at first without leaving its hole.
The maxillipeds form powerful hooked claws, by means of which the animals cling to the skin of the fish they infest, and in Caligus the basal segments of the antennules have a pair of suckers which aid in adhesion.
The antennules have only a single branch, and in the Woodlice are very small.
At once both antennulesare seen to be whipping in the direction in which the food is lying, and an active search is made with the antennae.
In these the carapace fuses with all the thoracic somites, the eyes are stalked, the antennules have two flagella, and the antennae have a broad scale.
The antennules are very large, unbranched and composed of numerous segments; the antennae are much smaller.
F), which are remarkable for having no appendages between the antennules and the first pair of swimming feet.
The antennuleshave a small inner branch, and the antenna have no exopodites.
In front of the head and above the gullet is a ganglion which sends nerves to the eyes, antennules and antennae, and is known as the brain, although it is, perhaps, hardly so important as that name would suggest.
Above the antennae are expanded antennal scales, which, together with the long bases of the antennules and very prominent eye-stalks, make the head a broad and conspicuous feature.
Both the antennules and the antennae are fringed with hairs, which aid in the sense of touch and perhaps of smell.
The antennules are frequently folded into small grooves.
The antennules are short, the antennae long, on two long, jointed bases.
The antennules are very long and are fringed with hair.
The antennules and antennae are of about the same length.
Both the antennulesand the antennae are slender, elongated, movable, and full of joints.
The antennules and first two pairs of biramous appendages of the cephalon are more or less hypothetical, and less is known of the appendages of the pygidium than is shown here.
The antennules of Triarthrus are apparently somewhat less flexible than those of the other genera, and have a double curvature that is seen among the others only in Ptychoparia.
The antennules are unusually well preserved and have about forty segments each in front of the cephalon, or an average of five to one millimeter.
The antennules and pleural lobes must be lost, the antennas and trunk limbs modified by loss of exopodites.
It is therefore evident that the antennules in this species are not attached beneath the dorsal furrows, but within them and opposite the second pair of glabellar furrows.
The first pair are very long multi segmented antennules and the next four pairs seem to be rather slender, spiniferous, jointed endopodites.
The antennules of two, one headed east and the other west, are imperfectly preserved, but the parts remaining diverge much more than do the antennules of those in the normal position.
The antennules are imperfectly known, but apparently short, while the antennas are long and slender, with relatively few, long, segments.
All cephalic appendages behind the antennules are attached somewhat within the dorsal furrows, the first pair as far forward as the antennules and the last pair apparently under the anterior edge of the neck ring.
The antennules appear to be short, while the antennas are large, with several segments, ending in three spines, and apparently adapted for serving as claspers in the male.
Jaekel refused to believe that the antennae of trilobites were really entirely simple, and so homologized them with the antennae and not the antennules of other Crustacea.
A well preserved individual, showing the antennules and some appendages of thorax and pygidium.
The antennæ moved slowly, but the antennulesremained motionless.
The former moved slightly as before, but the antennules were thrown into a rapid up-and-down jerky vibration, and shortly afterwards the crayfish began moving about the bottom of its tank.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "antennules" in a variety of sentences. We hope that you will now be able to make sentences using this word.
