Suborder TYLENCHINA

															Rev 12/17/2024

Classification:

      Chromadorea
	Rhabditida
       Tylenchina (Chitwood, 1950)

Synonyms:

      Heteroderina (Skarbilovich, 1959)
      Criconematina (Siddiqi, 1980)

Classification and Characteristics Chart of the Class Chromadorea. Order Rhabditida

• Sub-orders
  • Tylenchina
    • Tylenchoidea
    • Anguinoidea
  • Hoplolaimina
  • Hexatylina
    • Sphaerularioidea
    • Iotonchioidea
  • (per Sturhan and Hohberg, 2016)
• Superfamilies
  • Anguinoidea
    Iotonchioidea
  • Sphaerolaimoidea
  • Tylenchoidea
• Families
• Genera

Morphology and Anatomy:

      Stoma armed with an axial stylet.  Stylet in males and females generally with three basal knobs.  

Male feeding apparatus atrophied in some taxa.

Lip region may be distinct or may be undifferentiated from general body contour.  

Female esophagus composed of a procorpus, metacorpus and a glandular postcorpus, with an isthmus between the metacorpus and postcorpus.  The DEGO is in the anterior procorpus.  The metacorpus generally has a valve.  Glandular postcorpus may abut intestine or overlap it for some distance.  

Transverse cuticular annulation generally interupted by longitudinal incisures.  

Deirids present or absent.

Females with one or two genital branches.  Oviduct with two rows of seven cells. 

Males generally with caudal alae (bursa) with 0 or 1 ray and paired blade-shaped spicules.

[Ref: Maggenti, Luc, Raski, Fortuner, Geraert. Rev. Nematol. 10:135-142 (1987).]

Sturhan, D. and Hohberg, K. 2016. Nematodes of the order Rhabditida in Germany - the non-phytoparasitic species. Soil Organisms 88:19-41

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