Actinonema smolae

Actinonema longicaudatum	Contents	Rev: 03/02/2026
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Actinonema Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Chromadoridae Menu	Feeding	References
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Classification:

Chromadorea
Chromadoria
Chromadorida
Chromadoridae: Euchromadorinae
Actinonema smolae Muthumbi & Vincx, 1998

    Synonyms:

Morphology and Anatomy:

Males:

Body cylindrical, with almost uniform diam, anterior end blunt and the tail is elongate cylindrical.
Cuticle heterogenous, pharyngeal region with basket-work pattern; lateral differentiation a gap without punctation bordered by inverted â€˜Vâ€™ patterns on each annule.
Somatic setae are 5 um long and in four longitudinal rows, more conspicuous on the pharyngeal region
Amphids are large (90% cbd) with a double contour located at 3-4 um from the anterior end.
Six prominent solid cones located at 2â€“3 um from the anterior end; six inner labial sensilla are inconspicuous, six outer setae 3-4 um long and four cephalic setae 2um long
Stoma with a small dorsal tooth
Pharynx cylindrical and enlarged slightly to a posterior bulb; nerve ring at 52â€“57% of the pharynx length; ventral gland is small, posterior to the pharyngo-intestinal junction. Cardia not prominent.
Monorchic, with testis on the left of the intestine.
Spicules are absent and the telamons are 10-14 um long.
Gubernaculum short and solid
Tail is conical cylindrical,.

Females:

Didelphic, amphidelphic; ovary branches reflexed, anterior to the right of intestine, posterior to the left.

Ref: Muthumbi and Vincx, 1998

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

Ecosystem Functions and Services:

Muthumbi, A.W. and Vincx, M. 1998. Chromadoridae (Chromadorida: Nematoda) from the Indian Ocean: Difficulties in morphological identification of Actinonema Cobb, 1920 and Rhips Cobb, 1920 Hydrobiologia 364:155-167

Actinonema longicaudatum

Contents

Classification:

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Morphology and Anatomy:

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Distribution:

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Feeding:

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Biology and Ecology:

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Life Cycle:

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Ecosystem Functions and Services:

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Management:

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References:

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Copyright 1999 by Howard Ferris.
Revised: March 02, 2026.

Actinonema longicaudatum

Copyright 1999 by Howard Ferris. Revised: March 02, 2026.

Copyright 1999 by Howard Ferris.
Revised: March 02, 2026.