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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.

A

Loa loa

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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