8/9/2019 Nematode Table2

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RHABDITIF ORM LARVA (First Stage. Has bulbed

esophagus.)  FILARI FORM LARVA (Third Stage. Lacks prominent

bulb in esophagus.) Species  Size  Genital Primordium  Buccal Cavity  Size  Length of 

Esophagus  Tip of Tai

Strongyloidesstercoralis  225 m × 16 m.

Range, 200-300 m × 16-20 m. 

Prominent. Is anelongate, tapered, orpointed structurelocated along ventral

wall about the body

length. 

Short, about 1/3-1/2 as long as thewidth of theanterior end of the

body. 550 m × 20 m.Range, 500-550 m × 20-24 m. 

Extendsapproximately 1/2length of body. 

Notched. 

Hookworm  250 m × 17 m.Range, 200-300 m × 14-

17 m. Inconspicuous. Rarelydistinct. When seen, issmall, located nearerthe tail than that

of Strongyloides. Long.Approximately aslong as the widthof the body. 

500 m. Range,500-700 m × 20-

24 m. Extends about 1/41ength of body.  Pointed.