The inner edge of the first joint of the palp is furnished with "keys" which are rubbed against the mandible spines when the palps are vibrated.
C, la, ga) and externally a jointed limb or palp (fig.
In many blood-sucking flies, for example, the galea is absent, while the lacinia becomes a strong knife-like piercer and the palp is well developed.
In butterflies and moths the lacinia is absent while the galea becomes a flexible process, grooved on its inner face, so as to make with its fellow a hollow sucking-trunk, and the palp is usually very small.
In most cases, however, the palp loses its exopodite and it often disappears altogether, while the coxal segment forms the body of the mandible, with a masticatory edge variously armed with teeth and spines.
In a few Ostracoda, by a rare exception, the masticatory process is reduced or suppressed, and the palp alone remains, forming a pediform appendage used in locomotion as well as in the prehension of food.
The Ostracoda might have been derived from the same stock were it not that they retain the mandibular palpwhich all the Phyllopods have lost.
At the base of each maxilla is a rudimentarypalp (Mxp).
In the second pair of maxillæ the palp (Lp) is prominent; its base forms a blade, while the tip is still useful as an organ of touch.
The form and direction of the terminal segment of the labial palp afford valuable characters in classification.
The fifth radial nervure does not arise from the third, the maxillae are well developed, but their palps are obsolete; the head is densely clothed with erect scales; the terminal segment of the labial palp is short and obtuse.
The maxillae are developed but their palps are vestigial, while the terminal segment of the labial palp is short and pointed.
The larva of Cythere at the time of birth has rudiments of all the limbs, but the mandibular palp still functions as a limb, and the three feet (2nd pair of maxillae and two following appendages) are very rudimentary.
The mandible is palped, but the palp is completely separated from the cutting blade[198].
A palpsprouts on the mandible and the median eye disappears.
It seems not impossible that the appendage regarded by Claus as the mandibular palp may really represent the maxilla, which would otherwise seem to be absent.
Still later the cutting blade of the mandible is formed, and the palp (Nauplius appendage) is greatly reduced.
In the absence of the mandibular palp in all the Zoaea forms, its actual atrophy in the Penaeus Zoaea, and its universal reappearance in adult Malacostraca, are cases which tell in favour of the above explanation.
Before the close of the Zoaea condition a small and unjointed palpappears on the mandible.
Of the palp of the mandibles, as is usual amongst Zoaea forms, not a trace remains, though in the youngest Zoaea caught by Fritz Mueller a very small rudiment of the palp was present.
The absence of a palp on the mandible, a very marked character of the Zoaea as well as of the Phyllopoda.
Crustacea the "walking leg" of the mid-region of the body; it becomes the palp or jointed process of anterior segments.
The endopodite may be retained as a small segmented palp at the side of the gnathobase or disappear (mandible of Crustacea, Chilopoda and Hexapoda).
A second ramus, the "exopodite," often is also retained in the form of a palp or feeler.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "palp" in a variety of sentences. We hope that you will now be able to make sentences using this word. Other words: antenna; barbel; feeler
