Family Siphonolaimidae

Rev. 12/07/2021  

 Nematoda

Chromadorea

Chromadoria

Monhysterida

Linhomoeina

Siphonolaimoidea

Siphonolaimidae Filipjev, 1918 (sometimes ascriberd to Chitwood, 1937)
                
Two subfamilies:  Astomonematinae Kito & Aryuthaks, 2006   

       Siphonolaiminae Filipjev, 1918

A family of free-living marine nematodes, often reported from extuarine and mangrove habitats. Includes some taxa that lack a mouth.

• Body generally long and slender. Anterior and posterior end round.
• Cuticle striated.
• Anterior sensilla variable; six + six + four in the subfamily Sipholaiminae and zero + six + four or zero + zero + four in the subfamily Astomonematinae.
• Amphids circular.
• One or two gonads may be present.
• Gubernaculum apophysis oriented dorso-caudally.
• Tail short

Subfamily Astomonematinae

• Body long, slender, cylindrical
• Cuticle transversely striated
• Anterior rounded, with zero + six + four or zero + zero + four head sensilla.
• Amphids circular,
• Alimentary canal degenerated; mouth opening, buccal cavity, pharynx and anus absent, rudimentary gut containing prokaryotic microorganisms.
• Reproductive system didelphic amphidelphic in females, afiorchic or mnorchic in males.
• Tail usually with rounded in females.

Subfamily Siphonolaiminae

• Cuticle striated.
• Anterior with Six + four cephalic setae at more or less the same level. Outer labial setae always shorter than the cephalic setae.
• Amphids circular.
• Wall of the buccal cavity tapering to a spearlike point at the anterior end.
• Esophagus widened posteriorly to the buccal cavity and at the posterior end.
• Female monodelphic.

Ref: Fonseca and Bezerra

References:

Fonseco, G. Bezerra, T.N. 7.14 Order Monhysterida Filipjev, 1949. Handbook of Zoology

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