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Acta Parasitologica

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Volume 62, Issue 2 (Jun 2017)


Morphological description of Cosmocerca sp. (Nematoda: Cosmocerdidae) from the Mascarene grass frog Ptychadena cf. mascareniensis (Amphibia: Ptychadenidae). A light and scanning electron microscopic studies

Rewaida Abdel-Gaber
  • Corresponding author
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
  • Email:
/ Fathy Abdel-Ghaffar
  • Zoology Department, Faculty of Science, Cairo University, Cairo, Egypt
/ Reem Kamel
  • Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Heliopolis, Egypt
/ Sherein Maher
  • Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Heliopolis, Egypt
/ Nashwa El Deeb
  • Zoology Department, Faculty of Women for Arts, Science and Education, Ain Shams University, Heliopolis, Egypt
  • Biology Department, Faculty of Science-Yanbu, Taibah University, Medina, Saudi Arabia
/ Saleh Al Quraishy
  • Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia
/ Heinz Mehlhorn
  • Parasitology Institute, Düsseldorf University, Düsseldorf, Germany
Published Online: 2017-04-18 | DOI: https://doi.org/10.1515/ap-2017-0052


The Mascarene grass frog Ptychadena cf. mascareniensis is a species of frog with a vast area of distribution in Africa. A total of 300 frog specimens were collected from different localities at El-Giza province, Egypt; then dissected and examined for the presence of parasitic infection. Only eighty six (28.66%) specimens were found to be naturally infected with nematode parasite. Seasonally, the prevalence of infection was reached its maximum value of 74.66% during summer and minimum values of 26.66% (20/75), 13.33% (10/75) during spring and autumn, respectively; while no records were observed during winter season. The morphology of the recovered parasite was studied by using light and scanning electron microscopy. The adult worm characterized by anterior extremity with small mouth opening being surrounded by three lips provided with four sub-median cephalic papillae and one pair of lateral amphids. Body measurements showed that male worms were smaller than females measuring 1.22–2.43 (2.21 ± 0.1) mm in length and 0.21–0.34 (0.29 ± 0.01) mm in width. Females measured 1.9–3.7 (2.8 ± 0.1) mm in length and 0.24–0.42 (0.38 ± 0.01) mm in width. Comparing the present parasite with other species of the same genus described previously, several similarities were observed. However, peculiar new characteristics such as the arrangement of plectanes and somatic papillae, the presence of gubernaculum, the position of nerve ring, excretory pore, and vulval opening make it reasonable belongs to the family Cosmocercidae and identified as Cosmocerca sp. In addition, the present study was the first report for occurrence of cosmocercid species from the Mascarene grass frog in Egypt.

Keywords: Amphibians; Ptychadena cf. mascareniensis; Cosmocercids; morphological description


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About the article

Received: 2016-11-29

Revised: 2017-01-06

Accepted: 2017-01-20

Published Online: 2017-04-18

Published in Print: 2017-06-01

Conflict of interest Authors stated that there is no conflict of interest.

Citation Information: Acta Parasitologica, ISSN (Online) 1896-1851, ISSN (Print) 1230-2821, DOI: https://doi.org/10.1515/ap-2017-0052. Export Citation

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