an appendage attached to an oral part and serving as an organ of sense in insects, crustaceans, etc.
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How to use palpus in a sentence
Near the root or base of the mandibles on each side is a jointed feeler, or palpus; but spiders have no antenn.An Elementary Text-book of the Microscope | John William Griffith
The labium in Japyx is four-lobed and bears a small two-jointed palpus.Our Common Insects | Alpheus Spring Packard
The palpus, too, on this side was turned back to correspond to the direction of the legs nearest it.Studies in the Psychology of Sex, Volume 3 (of 6) | Havelock Ellis
Its true function appears to be that of an extra palpus or "feeler."
The palpus of the male (fig. 339) has large and complicated appendages at the end.The Common Spiders of the United States | James Henry Emerton