Paracanthonchus olgae

Paracanthonchus olgae	Contents	Rev: 06/14/2024
	Classification	Biology and Ecology
	Morphology and Anatomy	Life Cycle
Return to Paracanthonchus Menu		Ecosystem Functions and Services
	Distribution	Management
Return to Cyatholaimidae Menu	Feeding	References
	Go to Nemaplex Main Menu	Go to Dictionary of Terminology

Classification:

Chromadorea
Chromadoria
Chromadorida: Chromadorina
Chromadoroidea
Cyatholaimidae
Paracanthonchus olgae Tchesunov, 2015

    Synonyms:

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Morphology and Anatomy:

Body elongate fusiform or spindle-shaped.
Cuticle finely punctuated; no evident lateral field; striation only visible in some areas, e.g. on ventral side of the tail. .
Small crater-like pores arranged in two longitudinal rows, laterodorsal and lateroventral.; pores associated with subcuticular epidermal glands.
Six inner labial setae short and smooth. Six outer labial setae. Four cephalic setae
Amphideal fovea relatively close to the labial region, large, rounded in the external outline, ventrally coiled in a spiral of five turns.
Buccal cavity irregularly conoid or cyathiform.
Pharyngostome irregularly conoid or cyathiform with a large pointed dorsal tooth and two equal ventrosublateral pairs of much smaller equal acute teeth
Pharynx cylindroid and evenly muscular; small, slightly elongate ventral gland cell body with a nucleus and granulated cytoplasm situated ventrally to the cardia
Two oval vacuolized pseudocoelomocytes on right and left of ventral gland cell body.

Females:

Body narrowed ventrally just posterior to the vulva.
Didelphic, amphidelphic; ovaries antidromously reflexed.

Ref: Tchesunov, 2015

Males:

Monorchic.
Spicules weakly sclerotized, distally pointed, proximally slightly narrowed.
Gubernaculum paired: two large spoon-shaped parts and wide arcuate distal ends of the parts armed with median conical spike and numerous tiny spinelets
Five midventral precloacal supplements but varying in size and number among individuals,
Tail conical, with terminal conical spinneret 5-9 um long

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

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Distribution:

Free-living marine nematodes described from 2260-2350 meter depth from an aggregate of mussels at Rainbow hydrothermal sit.Northern Mid-Atlantic Ridge.

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Feeding:

Probably epistrate feeders with scraping tooth in stoma (Heip et al., 1998; Tchesunov, 2015). One specimen observed with and ingested juvenile nematode.

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Biology and Ecology:

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Life Cycle:

Ecophysiological Parameters:

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

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Ecosystem Functions and Services:

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Management:

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References:

Heip, C., Vincx, M., Vranken, G. 1985. The ecology of marine nematodes. Oceanography and marine biology. Ann Rev Lond 23:399-489

Tchesunov, A.V. 2015. Free-living nematode species (Nematoda) in hydrothermal sites of the North Mid-Atlantic Ridge. Helgoland Marine Research 69:343-384.

Paracanthonchus olgae

Copyright 1999 by Howard Ferris. Revised: June 14, 2024.

Copyright 1999 by Howard Ferris.
Revised: June 14, 2024.