Korean J Parasitol.  2002 Jun;40(2):67-73. 10.3347/kjp.2002.40.2.67.

Tegumental ultrastructure of Echinoparyphium recurvatum according to developmental stages

Affiliations
  • 1Department of Parasitology and Institute of Health Sciences, Gyeongsang National University College of Medicine, Chinju, Korea.
  • 2Department of Veterinary, College of Agriculture, Cheju University, Cheju, Korea.
  • 3Department of Parasitology, College of Medicine, Chung-Ang University, Seoul, Korea.

Abstract

The present study was performed to observe tegumental ultrastructure of Echinoparyphium recurvatum according to developmental stages. Worms (1, 3, 5 and 15-day old) were recovered from chicks experimentally infected with metacercariae from Radix auricularia coreana. One-day old worms were elongated and ventrally concave, and covered with peg-like tegumental spines except the adjecent areas of the head crown and excretory pore. Type I sensory papillae were distributed on the lip of the oral sucker, and grouped ciliated papillae were around the oral sucker. Peg-like tegumental spines were densely distributed on the anterior surface of the ventral sucker level. The ventral sucker had an aspinous tegument and no sensory papillae. Tegumental spines on the posterior surface of the ventral sucker level were sparsely distributed and disappeared posteriorly. In 3 and 5-day old worms, the tegument around the oral sucker was aspinose and wrinkled concentrically. The ventral sucker had a wrinkled tegument and many bulbous papillae. Type I sensory papillae were distributed between the bulbous papillae. Tegumental spines were spade-shaped with a terminal tip. A total of 45 collar spines including 4 end group ones on both ventral corners was alternately arranged in 2 rows. The 15-day old worms were very stout and their tegumental spines were tongue-shaped without a terminal tip. From the above results, it is confirmed that the surface ultrastructure of E. recurvatum was generally similar to that of other echinostomatid flukes. However, some features, i.e., morphological change of tegumental spines and appearence of sensory papillae on the ventral sucker according to development, and number, shape and arrangement of collar spines, were characteristic, which may be of taxonomic and bioecological significance.

Keyword

Echinostomatidae; Scanning electron microscopy; Life cycle stages

MeSH Terms

Animals
Chickens
Echinostomatidae/anatomy & histology/growth & development/*ultrastructure
Life Cycle Stages
Lymnaea/parasitology
Microscopy, Electron, Scanning
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