Patagonema iubatum

 

Contents

 

Rev: 06/16/2026

  Classification    
Morphology and Anatomy Life Cycle
Return to Patagonema Menu Economic Importance    
Distribution Management
Return to Oncholaimdae Menu Feeding  References
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Classification:

Enoplea
     Enoplia
        Enoplida
          Oncholaimina
              Oncholaimoidea
                    Oncholaimidae
             Octonchinae

Paragonema iubatum Pastor De Ward, Lo Russo & Villares, 2015

Type species of the genus

    Synonyms:

     
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Morphology and Anatomy:

 
  • Cuticle smooth; scattered somatic setae in cervical region.
  • Buccal cavity with sclerotized walls, longer than wide; armed with three typical oncholaimid teeth, two ventrosublateral teeth with longest on right side and one small dorsal tooth, and three mandibular ridges with small teeth in ventral and lateral position. Valve present at base of stoma.
  • Amphids pocket to bowl-shaped
  • Pharynx cylindrical, slightly widening posteriorly; outer wall not crenellate; cardia conspicuous.
  • The buccal cavity with more than 3 teeth places the genus in the subfamily Octonchinae.

Male:

  • Diorchic, testes opposed and outstretched
  • Spicules short with well-developed manubrium.
  • Gubernaculum with dorsal apophyses and lateral curved crura.
  • Precloacal papilliform supplements  (9-10) plus two subventral setae.
  • Three caudal gland with cell bodies anterior to cloaca. opening at tail tip.
  • Tail length 3.6 x cbd

Female:

  • Didelphic-amphidelphic. ovaries reflexed
  •  Demanian system consisting of two ducts: one short tube between oviduct and osmosium which connects to the intestine (ductus entericus), one short tube connection from oviduct junction to uvette that connects to the uterus (ductus uterinus). Near vulva opening, on left side of the body, there is a second connection between the uterus and the intestine. Surrounding this connection several disc-shaped cells (glands) have been observed. This connection has a short tube that seems to have its end (on left side), on surface of the body with a similar structure to a porus terminalis. Demanian system similar to those in the genera Viscosia and Meyersia.

Ref: Pastor De Ward et al., 2015

Patagonema iubatum (A) apical view; (B) female head (external); (C) male head (external); (D) hfemale head (internal); (E) male head (internal); (F) male cloaca; (G) male posterior. Scale bars: 20 um.
Drawings from Pastor De Ward et al., 2015

 

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

 

 

 
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Distribution:

Marine nematodes, described from a bay at Playa Pozo, Golfo Nuevo, Chubut Province, Argentina (latitude/longitude 42849′ S 64852′ W) on the Atlantic coast of South America.

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Economic Importance:

 

 

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Feeding:

 

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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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Management:

 
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References:

Pastor De Ward, C.T., Lo Russo, V., Villares, G. 2015. Patagonema iubatum gen. nov. and sp. nov. (Nematoda,Oncholaimidae, Octonchinae) from Patagonia sandy beach (Argentina). Journal of the Marine Biological Association of the United Kingdom. 95:101-109. doi:10.1017/S0025315414000708

 
 
Copyright © 1999 by Howard Ferris.
Revised: June 16, 2026.