Gammanema magnum		Contents		Rev: 08/31/2026
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Gammanema Menu				Biology and Ecology
		Distribution		Management
Return to Selachinematidae Menu		Feeding		References
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Classification:

Chromadorea

  Chromadoria

Chromadorida

    Selachinematidae

Choniolaiminae

       Gammanema magnum Huang & Guo, 2022

    Synonyms:
     

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Morphology and Anatomy:

Gammanema magnum is characterized by:

• Body 2540–4085 um long.
• Six short leaf-like broad-based inner labial setae, six long leaf-shaped broad-based outer labial setae with broad base and four slender cephalic setae arranged in three circles.
• Anterior buccal cavity broad and cup-shaped with 12 sclerotized rhabdia, each with about six denticles at posterior end; posterior buccal cavity narrow and cylindrical with six broad rhabdia, surrounded by pharyngeal tissue.
• Amphideal fovea with extreme sexual dimorphism: large loop with 1.3 turns occupying about 80% of corresponding body diameter in males and very small spiral witht two turns occupying 12-14% of corresponding body diameter in females.
• Pharynx with slightly swollen anterior.
• Tail short and conical
• Three caudal glands with spinneret

Ref: Huang and Guo, 2022 

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Distribution:

Marine nematodes. Recorded from intertidal sandy sediments

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Feeding:

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Biology and Ecology:

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Life Cycle:

Ecophysiological Parameters:

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Biology and Ecology:

Predator,

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Management:

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References:

Huang, Y. and Guo, Y. 2022. Free-living Marine Nematodes from the East China Sea. Springer, Singapore and Science Press, Beijing.

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Revised by Howard Ferris: August 31, 2026.