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Diagnostic Parasitology > (M) Nematoda: Morphology of Secernentea [Strongylida, Rhabtida, Oxyurida, Spirurida] (lecture-based) > Flashcards

(M) Nematoda: Morphology of Secernentea [Strongylida, Rhabtida, Oxyurida, Spirurida] (lecture-based) Flashcards

Strongylida, Rhabtida, Oxyurida, Spirurida

1
Q

Order of the Subclass Secernentea

A
  • Ascaridida
  • Strongylida
  • Rhabditida
  • Oxyurida
  • Spirurida
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2
Q

Species under Ancylostomatoidea

A
  • Necator americanus
  • Ancylostoma duodenale
  • Ancylostoma caninum
  • Ancylostoma braziliense
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3
Q

Order of the super family Ancylostomatoidea

A

Strongylida

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4
Q

Species under Metastrongyloidea

A

Angiostrongylus cantonensis

Strongylida superfamily

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5
Q

Species under Rhabdiascoidea

A

Strongyloides stercoralis

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6
Q

Order and Super family of Strongyloides stercoralis

A

Rhabditida & Rhabdiascoidea

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7
Q

Sp. under Oxyuroidea

A

Enterobius vermicularis

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8
Q

Sp. under Gnathostomatoidea

A

Gnathostoma spinigerum

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9
Q

Sp. under Filarioidea

A
  • Wuchereria bancrofti
  • Brugia malayi
  • Loa loa
  • Onchocerca volvulus
  • Mansonella ozzardi
  • Mansonella persians
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10
Q

Strongylida

Feeding Stage
250 um
Open Mouth
Bulbous Esophagus
Long, Narrow Buccal Cavity

A

Rhabditiform larva

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11
Q

Strongylida

700 um
Closed Mouth
Pointed Tail

A

Filariform larvae

infective stage for hookrowms

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12
Q

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
A

Rhabditiform larva

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13
Q

Rhabditida

DF Rhabditiform larva

A

Club-shaped esophagus

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14
Q

Oxyurida

Prominent Cephalic Alae.
Bulb-like Esophagus.
Female: Sharply-Pointed End
Male: Curved Caudal End
Egg: Described as D-Shaped or Lopsided Egg.

A

E. vermicularis

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15
Q

Oxyurida

DF of Male E. vermicularis

A

bulb-like esophagus

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16
Q

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

A

Gnathostoma spinigerum

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17
Q

Spirurida

Ovoid, Transparent Shell
Superficially Pitted
* Mucoid Plug in one end

A

Gnathostoma spinigerum

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18
Q

DF of Egg Gnathostoma spinigerum

A

Mucoid plug in one end

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19
Q

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

A

NEcator americanus

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20
Q

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

A. duodenale

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21
Q

Metastrongyloidea

Adult Female
* Barber-pole Appearance.
* The Anterior End of Worm is on the Top.
* The Scale Bar is 1mm

A

Angiostrongylus cantonensis

22
Q

Metastrongyloidea

  • Tail of adult male of Angiostrongylus cantonensis, showing Copulatory Bursa and Long Spicules (arrows).
  • Scale bar is 85 um.
A

Angiostrongylus cantonensis

23
Q

Sheathed Filiaria worms

A
  • Wuchereria bancrofti
  • Loa loa
  • Brugia malayi
24
Q

Filarial worms

  • The Adult Worms of W. bancrofti, inhabit the Lymphatic Vessels and Glands.
  • Minute, Thread-Like, Smooth-Skinned, and Tapered on Both Ends.
  • But Bluntly Rounded At The Most Terminal
A

Adult morphology W. bancrofti

25
Q

Filarial worms

Size: 40mm long x 0.1mm in diameter
Sharply Curved Posterior.

A

Male W. bancrofti

26
Q

Filarial worms

Size: 80-100mm x 0.24-0.30mm
With Vulva at Cervical Region, Single Uterus, but all the remaining reproductive organs are paired.

A

Female W. bancrofti

27
Q

Filarial worms

Size: 244-296um long x 7.5-10 um in diameter
Sheathed with Graceful Curves.
Bluntly Rounded Anterior w/ Short Space Devoid of Nuclei.
Pointed Caudal Part.
Smooth Cuticle.
Body Nuclei Are Equidistant And Regularly

A

Microfilaria Wuchereria bancrofti

28
Q

Filarial worms

Male Size: 13-23 mm long x 70 - 80 um in breadth.

Female Size: 43 - 55mm long, 130 - 170 um.

Microfilaria Size: 177-230 um

Bluntly Rounded Anterior.

Sheathed, with a Stiff & Kinky Body.

Unevenly Distributed Body Nuclei.

Two Prominent Terminal Nuclei

A

Brugia malayi

29
Q

Filarial worms

DF of Microfilaria size

A

2 prominent terminal nuclei

30
Q

Filarial worms

Male Size: 30 - 34 mm x 0.35 - 0.43 mm
Female Size: 40 - 70 mm x 0.5 mm
Microfilaria Size: 250 - 300x6 - 8um
Rounded Anterior End
Very Small or No Cephalic Spaces
Irregular Curves of Body covered with Thin
Transparent Sheath.
Irregularly Distributed Body Nuclei that reached up to the Caudal End.

31
Q

Filarial worms

Unsheathed filaria worms

A
  • Onchocerca volvulus
  • Mansonella ozzardi
  • Mansonella perstans
32
Q

Filarial worms

Found in in Lymphatic Fluids and Both Adults.
* May be found in the Skin and Subcutaneous
Tissues where they produce Fibrous Nodules.

A

Microfilariae O. volvulus

33
Q

Filarial worms

this are are White, Opalescent, and Transparent.
* With Distinct Transverse Striations Of The

A

Adult worms O. volvulus

34
Q

Filarial worms

Male Size: 19-24 mm long x 130-210 um.
Female Size: 3.5-50 mm x 270-400 um.
* Microfilariae Size: 315-360 um x 6 um.
* With Both Ends Free of Nuclei.
They may be found in the blood, urine, and sputum.
* But more commonly in the Lymphatic of the
Connective Tissues.
* Cutaneous layers in an Area around the Adult
Worms in the Corneal Conjunctivae.

A

O. volvulus

35
Q

Filarial worms

Male Size: 45 mm long × 60 um
Female Size: 70 - 80 mm long × 120 um
Microfilaria Size: 200 um x 4.5
* The body nuclei fill up the entire body.
* No Distinct Space at Cephalic or Tail

A

Mansonella perstans

36
Q

NECATOR AMERICANUS (New World Hookworm)

DF of Rhabditiform larva

A

Inconspicuous genital primordium at midpoint

37
Q

NECATOR AMERICANUS (New World Hookworm)

DF of the copulatory bursa

A

Bi-partite dorsal ray (characteristic feature)

38
Q

NECATOR AMERICANUS (New World Hookworm)

DF Necator americanus buccal sample

A

buccal capsule with a pair of thin semi-lunar cutting plates

39
Q

ANCYLOSTOMA DUODENALE (Old World Hookworm)

DF Rhabditiform larva

A

Inconspicuous genital primordium at midpoint

40
Q

ANCYLOSTOMA DUODENALE (Old World Hookworm)

DF filariform larva

A

W/ less conspicuous striations of the sheath, narrow angle between tail and sheath

41
Q

ANCYLOSTOMA DUODENALE (Old World Hookworm)

Characteristic feature of the copulatory bursa

A

Tri-partite dorsal ray

42
Q

Angiostrongylus cantonensis (Rodent Lung Worm)

Diagnostic feature of Adult female

A

“barber’s pole appearance”

43
Q

STRONGYLOIDES STERCORALIS (THREADWORM)

DF of the Esophagus (rhabditiform larvae)

A
  • Club-shaped Esophagus w/ Posterior Bulb
  • Conspicuous/prominent genital primordium
44
Q

STRONGYLOIDES STERCORALIS (THREADWORM)

DF of filariform larva

A

→ Notched & bifid caudal end

45
Q

ENTEROBIUS VERMICULARIS (PINWORM, SEAT WORM, OR SOCIETY WORM)

DF of Male

A

bulb-like esophagus without true buccal capsule

46
Q

ENTEROBIUS VERMICULARIS (PINWORM, SEAT WORM, OR SOCIETY WORM)

Egg shape

A

D-shaped or Lopsided egg appearance

47
Q

Gnathostoma spinigerum

DF of adult

A

Cephalic end: sub-globose, the
swollen part w/ constriction

48
Q

Gnathostoma spinigerum

DF of egg

A

Prominent mucus plug at 1 pole (diagnostic)

49
Q

Spiral dark-colored body producing “barber’s pole” appearance

A

Angiostrongylus cantonensis

50
Q

ENTEROBIUS VERMICULARIS

DF Gross/Adult

A

Cephalic alae and prominent bulbous esophagus

Diagnostic Parasitology (36 decks)

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