Paraxiphidorus heynsi

 

Contents

 

Rev 02/04/2021

  Classification Hosts
Morphology and Anatomy Life Cycle
Return to Paraxiphidorus Menu Economic Importance Damage
Distribution Management
Return to Longidoridae Menu Feeding  References
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Classification:

      Dorylaimida
       Dorylaimina
        Dorylaimoidea
         Longidoridae
          Longidorinae

           Paraxiphidorus heynsi Coomans & Chaves, 1995

The type species of the genus.

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Morphology and Anatomy:

 

  • Body long and rather slender, spiral upon fixation.
  • Cuticle 4 (3.5-4.5) ,urn thick at mid-body, thicker near anterior end and 13.8 (12-l 7),um thick at tail tip with three main layers; with very fine transverse striations at the surface (SEM) and inner radial striations which are most prominent in the tail region.
  • Lateral chord 20.3 (18-24) ,um wide at mid-body, i.e. 24.4 (20.5-30) % of the corresponding body width.
  • Lateral body pores numerous, but dorsal and ventral body pores few and restricted to the odontostyle region and neck region anterior to bulb, respectively; 7 (5-9) dorsal, 11.3 (10-13) ventral and 16.6 (15-18) lateral pores in the neck region.
  • Lip region hemispherical to slightly flattened anteriorly, offset by a marked constriction. Body cuticle behind constriction bulging outward due to thickening of median layer.
  • Anterior sensilla 6 + 10, appearing as minute pores under SEM.
  • Amphids with stirrup-shaped fovea and wide slit-like opening occupying 70-80% of the width at the constriction.
  • Odontostyle long and slender, with forked base. Guiding ring single, located posteriorly.
  • Odontophore with weak, but clearly visible flanges. Pharyngeal retractors well developed.
  • Slender part of pharynx not offset from enlarged part; latter at first conical, then cylindrical.
  • Dorsal gland nucleus smaller than ventrosublateral nuclei. Positions of outlets and nuclei as percentage of bulb length (n = 3) : DO : DN: DO-DN: 10.1 ( 9. 1-10.7) 23.5 (20.8-26.9) 13.5 (11.7-16.2) LSN: RSN: SO: 51.3 (45.5-54.7) 51.7 (46.5-54.7) 75.0 (73.1 -76.6)
  • Pharyngo-intestinal junction wide and flattened.
  • Tail dorsally convex-conoid with bluntly rounded terminus, without blind canal.

Female:

  • Two caudal pores at each side in all females and one adana! pore at each side in two females and at one side in one female.
  • Female reproductive system didelphic, amphidelphic. Different parts variable in length according to stage of maturation.
  • Uterus with rhomboid crystalloids mainly in its distal part; without pars dilatata.
  • Sperm may be present throughout the uterus, it is stored in the pars dilatata oviductus (functional spermatheca); small numbers may be encapsulated in the slender part of the oviduct. Proximal part of both uteri forming a poorly defined ovejector.
  • Vagina 43 (40-46) ,urn long, extending inward to 49-55% of the corr.esponding body width.
  • Vulva a transverse slit.

Male:

  •  Similar to females in most respects except for sexual characters. Body more curved in posterior region.
  • Odontostyle base less clearly forked than in females.
  • Tail with slightly concave ventral side; with 2-3 caudal pores at each side and one adana! pore at each side or at one side of tail.
  • Reproductive system typical for genus, with 4-5 ejaculatory glands; 60-64 copulatory muscles and ten (4 + 6) accessory copulatory muscles; 10-11 ventromedian supplements and 6-8 subventral body pores in the region of the copulatory muscles.
  • Spicules stout, ventrally curved; lateral guiding pieces rod-shaped.

 

 
 
 
 
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Distribution:

Described from moist soil covered with decaying leaves in the "Reserva de fauna aut6ctona del Uruguay", East side Cerro Pan de Azucar, near Piriapolis, Maldonado, Uruguay.

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Economic Importance:

 

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Feeding:

Migratory ectoparasite of plant roots.

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Hosts:

 

For an extensive host range list for this species, click

 

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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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Damage:

 

 

 
 
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Management:

Host Plant Resistance, Non-hosts and Crop Rotation alternatives:

For plants reported to have some level of resistance to this species, click

 

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References:

 

Coomans, A. Chaves, E., De Leon, L. 1996. Xiphidorini (Nematoda: Longidoridae) from Uruguay. .Bull. Inst. Roy. Sci. Nat. Belgique, Biologie 66:5-15. 

Decraemer, W, and Robbins, R.T. 2007.  The who, what and where of Longidoridae and Trichodoridae.  J. Nematology 39:295-297.

 

 

 
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Copyright © 1999 by Howard Ferris.
Revised: February 04, 2021.