Family Neotonchidae

Revised 12/09/24

Classification:

Nematoda

Chromadorea

Chromadoria

Chromadorida

Chromadorina

Chromadoroidea

Neotonchidae Wieser & Hopper, 1966

free-living marine nematodes

Sometimes considered a member of family Cyatholaimidae or as a subfamily of Ethmolaimidae Filipjev and Schuurmans Stekhoven, 1941

Neotonchidae - are nematodes of marine sediments.

Type genus of the family: Neotonchus Cobb, 1933.

Family Characteristics:

• Cuticle striated with transverse rows of punctations
• Cephalic sensilla arrangement in 3 circles of 6+6+4 (inner and outer labial (six each)  are papilliform and cephalc (four) are setiform.
• Amphids multispiral
• Buccal cavity elongate with large dorsal tooth, with or without subventral teeth.
• Esophagus with muscular posterior bulb
• Tail usually conical with rounded tip.
• Male monorchic with cup-shaped precloacal supplements.
• Reported worldwide.

Ref: Bezerra et al., 2013; Tchesunov, 2013; Wieser and Hopper, 1966

References:

Bezerra, T.N., Pape, E., Hauquier, F., Vanreusel, A., Ingels, J. 2013. New genus and two new species of the family Ethmolaimidae (Nematoda: Chromadorida), found in two different cold-seep environments. Zootaxa 3692 DOI: http://dx.doi.org/10.11646/zootaxa.3692.1.4

Tchesunov, A.V.. 2013. 7.12 Order Chromadorida Chitwood, 1933 In Schmidt-Rheas and de Gruyter, W. Handbook of Zoology.Gastrocticha, Cycloneuralia, Gnatifera. Volume 2: Nematoda

Wieser, W. and Hopper, B. 1966. The Neotonchinae, new subfamily (Cyatholaimidae: Nematoda), with an analysis of its genera, Neotonchus Cobb, 1933 and Gomphionema new genus. Canadian J. Zool.  44:519-532.

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