(M) Nematoda: Morphology of Secernentea [Strongylida, Rhabtida, Oxyurida, Spirurida] (lecture-based) Flashcards
Strongylida, Rhabtida, Oxyurida, Spirurida
Order of the Subclass Secernentea
- Ascaridida
- Strongylida
- Rhabditida
- Oxyurida
- Spirurida
Species under Ancylostomatoidea
- Necator americanus
- Ancylostoma duodenale
- Ancylostoma caninum
- Ancylostoma braziliense
Order of the super family Ancylostomatoidea
Strongylida
Species under Metastrongyloidea
Angiostrongylus cantonensis
Strongylida superfamily
Species under Rhabdiascoidea
Strongyloides stercoralis
Order and Super family of Strongyloides stercoralis
Rhabditida & Rhabdiascoidea
Sp. under Oxyuroidea
Enterobius vermicularis
Sp. under Gnathostomatoidea
Gnathostoma spinigerum
Sp. under Filarioidea
- Wuchereria bancrofti
- Brugia malayi
- Loa loa
- Onchocerca volvulus
- Mansonella ozzardi
- Mansonella persians
Strongylida
Feeding Stage
250 um
Open Mouth
Bulbous Esophagus
Long, Narrow Buccal Cavity
Rhabditiform larva
Strongylida
700 um
Closed Mouth
Pointed Tail
Filariform larvae
infective stage for hookrowms
idenfity larva
- 250 um; Short Buccal Cavity
- Prominent Primordial Genitalia
- Compared to hookworms, the primordial genitalia is more prominent in Strongyloides stercoralis.
- Club-Shaped Esophagus w/ Posterior
Rhabditiform larva
Rhabditida
DF Rhabditiform larva
Club-shaped esophagus
Oxyurida
Prominent Cephalic Alae.
Bulb-like Esophagus.
Female: Sharply-Pointed End
Male: Curved Caudal End
Egg: Described as D-Shaped or Lopsided Egg.
E. vermicularis
Oxyurida
DF of Male E. vermicularis
bulb-like esophagus
Spirurida
Has Sub-globose Cephalic swelling separated from the remainder of the body by Cervical Constriction.
Male: Pseudo-Bursa
Female: Slightly Post-equatorial in position
Gnathostoma spinigerum
Spirurida
Ovoid, Transparent Shell
Superficially Pitted
* Mucoid Plug in one end
Gnathostoma spinigerum
DF of Egg Gnathostoma spinigerum
Mucoid plug in one end
Strongylida
Male: 7-9 mm x 0.3 mm diameter
Female: 9-11 mm x 0.4 mm diameter
Egg: 64-76 x 36-40 microns elongate with transparent shell, 2-8 cell stage of development.
Filariform Larva: With conspicuous striations of the sheath, tail-end forms a wide angle with the sheath
NEcator americanus
Strongylida
Male: 8-11 mm x 0.4-0.5 mm diameter
Female: 10-13 mm x 0.6 mm diameter
Egg: Same as N. americanus but more rounded.
Filariform Larva: With less conspicuous striations of the sheath, narrow angle between tail and sheath.
A. duodenale