Patagonema

 

Contents

 

Rev 06/16/2026

  Classification Hosts
Morphology and Anatomy Life Cycle
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Distribution Management
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Classification:

      
Enoplea
     Enoplia
        Enoplida
          Oncholaimina
              Oncholaimoidea
                    Oncholaimidae
     Octonchinae

Patagonema Pastor De Ward, Lo Russo & Villares, 2015

Type species of the genus: Patagonema iubatum Pastor De Ward, Lo Russo & Villares, 2015

Synonyms:

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Morphology and Anatomy:

  • Stoma 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.
  • 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:

  •  Spicules short,
  • Gubernaculum with dorsal apophyses and lateral curved crura.
  • Precloacal papilliform supplements plus two subventral setae.

Female:

  • Didelphic
  • 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
 
 
Body size range for the species of this genus in the database - Click:
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Distribution:

Type species 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:

Food Sources and Feeding strategies for the genus Patagonema

 

 

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Life Cycle:

For Ecophysiological Parameters for this genus, click 
 
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Damage:

 

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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

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