Tanqua tiara




Rev 11/01/2022

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  Tanqua tiara (von Linstow, 1879) Blanchard, 1904


Ascaris tiara von Linstow, 1879

Ctenocephalus tiara von Linstow, 1897; von Linstow, 1904a.

Tetradenos tiara von Linstow, 1897; von Linstow, 1904b.

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Morphology and Anatomy:

Tanqua tiara: 35: Male anterior; 36: Junction of esophagus and intestine, male;  37: femele en face view; 38: :male tail, ventral  


  • Spicules with pitted surface
  • Two pairs of precloacal caudal papillae, 2 pairs of parallel adcloacal papillae, external pair larger than the internal pair, 4 pairs of post cloaca1 papillae
  • Tail with pointed tip.


  •  Small vulvar opening without lips or flaps
  • muscular vagina divides distally each branch dividing again to form four uteri; eggs

Ref: Gibbons and Keymer, 1991

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:


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Tanqua tiara is widespread among lizard host species

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In a stucy of parasitism of the Nile monitor lizard, Varanus niloticus, bu Tanqua tiara, the adult nematodes attached singly to the host�s stomach wall and penetrated deep into the submucosa.

  Deep pores in the mucosa marked entrance to pit-like formations caused by the deep penetration of nematodes into the submucosa

 Removal of an adult nematode from one of the pit-like formations revealed a �mirror image� of the cephalic region showing a serrated surface of host tissue corresponding to the ridges on the cephalic bulb of the parasite

 The host tissue forms a tight collar around the invaginated cervical region.

The attachment of the parasite to the stomach wall causes severe damage to the mucosa and destruction of gastric epithelium.

The parasite lives in a hostile environment in the alimentary tract of its host and requires a mechanism to retain it in position. The effect of the cephalic bulb of the nematode on the host tissues suggests that the presence of the transverse ridges on the cephalic bulb in addition to the ability to change its shape, and the extendable cervical region, creates an effective holdfast to retain the nematode in the stomach wall of the host (Gibbons and Keymer, 1991)..

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Biology and Ecology:


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Life Cycle:



Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click If species level data are not available, click for genus level parameters

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Ecosystem Functions and Services:


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Baylis, H. A. 1916. The nematode genus Tanqua, R. B1anchard.-Ann. Mag. nut. Hist. (Ser. 8) 17: 223-232

Gibbons, L. M. & Keymer, I. F. 1991. Redescription of Tanqua tiara (Nematoda, Gnathostomidae), and associated lesions in the stomach of the Nile monitor lizard (Varanus niloticus).Zool. Scr. 20:7-14.

Von Linstow, 0. F. B. 1879.  Helminthologische  Untersuchungen. Jber. Ver. Vaterl. Naturk. Wurtemberg 35:313-342.

Von Linstow, 0. F. B. 1904. Nematoda in the collection of the Colombo Museum.-Spolia Zeylanica 1:1-14.

Von Linstow, 0. F. B. 1904. Beobachtungen  an  Nematoden und Cestoden.-Arch. fur Naturgesch. 70:297-309.

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Copyright © 1999 by Howard Ferris.
Revised: November 01, 2022.