Rev: 09/22/2022

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Cygnonema Menu Ecosystem Functions and Services
Distribution Management
Return to Draconematidae Menu Feeding  References
    Go to Nemaplex Main Menu   Go to Dictionary of Terminology



  •         Cygnonema Allen & Noffsinger, 1978


    Type species:  Cygnonema steineri Allen & Noffsinger, 1978

    Back to Top

    Morphology and Anatomy:

    Cygnonema verum (adapted from Raes et al., 2009)

    • Body length 1-3.1 mm, slender, S-shaped (Cygnonema = swan nematode), enlarged at level of pharynx.

    • Cuticle smooth or inconspicuous striation.

    • Cephalic adhesion tubes 10-16  with enlarged base and fine or slightly swollen tip, arranged in 4 longitudinal rows

    • Posterior adhesion tubes with bell-shaped tip, in 4 rows.

    • Subcephalic setae 2-18

    • Amphid apertures behind head capsule, loop-shape in males, inconspicuous and tubulkar in female.

    • Buccal cavity weakly developed, with or without a dorsal tooth.

    • Pharynx long and cylindrical with oval or elongate terminal bulb

    • Cloacal/anal flap may be present.


    • Didelphic, ovaries reflexed.

    • Short paravulval setae present.




    • Monorchic.
    • Tail conical-cylindrical


    Ref: Raes et al., 2009

    Body size range for the species of this genus in the database - Click:
    Back to Top


    Marine nematodes reported from cold water habitats in Antarctica and the North Atlantic ocean. Sometimes with degraded coldwater coral and sponges.

    Back to Top






    Back to Top

    Biology and Ecology:


    Back to Top

    Life Cycle:

    For Ecophysiological Parameters for this genus, click 
    Back to Top

    Ecosystem Functions and Services:


    Back to Top


    Back to Top


    Allen MW, Noffsinger EM (1978) A revision of the marine nematodes of the superfamily Draconematoidea Filipjev, 1918 (Nematoda: Draconematina). Univ Calif Publs Zool 109: 1–133

    Decraemer W, Gourbault N, Backeljau T (1997) Marine nematodes of the family Draconematidae (Nemata): a synopsis with phylogenetic relationships. Hydrobiologia 357: 185–202

    Raes, M., Decraemer, W., Vanreusel, A. 2009. Draconematidae (Nematoda) from cold-water corals in the PorcupineSeabight: The genus  Cygnonema  Allen & Noffsinger, 1978. Organisms, Diversity, Evolution  37:e1-e20.


    Back to Top

    Copyright © 1999 by Howard Ferris.
    Revised: September 22, 2022.