Question:
Which of the following nematode possess knob-less spear?
Which of the following nematode possess knob-less spear?
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Psilenchus is a classic genus taught in introductory nematology because of its unique taxonomic feature: a stylet without basal knobs.
Updated On: Aug 18, 2026
- Paratylenchus
- Hoplolaimus
- Psilenchus
- Criconema
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The stylet (or spear) is a specialized feeding apparatus of plant-parasitic nematodes.
Its morphological structure (presence, absence, or shape of basal knobs) is a key diagnostic feature used in nematode taxonomy.
Step 2: Detailed Explanation:
Most plant-parasitic nematodes in the order Tylenchida possess a stylet with three distinct basal knobs that anchor the stylet protractor muscles.
Genera like Paratylenchus, Hoplolaimus, and Criconema have prominent, well-developed basal knobs.
However, the genus {Psilenchus is characterized by a slender stylet that lacks basal knobs (knob-less spear) or occasionally has very weak, indistinct swellings.
Step 3: Final Answer:
The nematode that possesses a knob-less spear is Psilenchus, matching option (C).
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