What key difference is noted when microscopically distinguishing the species *C. glandium* from *Curculio nucum*?
Answer
*C. glandium* has three segments in the bulbous end of its antennae, while *C. nucum* has four.
The morphological distinction between *C. glandium* and *Curculio nucum* rests on the number of segments in the bulbous end of their antennae; *C. glandium* possesses three segments, whereas *C. nucum* possesses four.
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