Redescription of Porrocaecum semiteres (Zeder, 1800) (Nematoda: Ascaridida) from the Song Thrush Turdus philomelos (Passeriformes: Turdidae)



Porrocaecum semiteres (Zeder, 1800) (Ascaridida: Ascaridoidea) occurs frequently in various birds in Europe. However, the knowledge of the morphology of this species remains insufficient.


Light and scanning electron microscopy were used to study the detailed morphology of adults of P. semiteres based on newly collected specimens from Turdus philomelos in the Czech Republic.


Some previously unreported morphological features were revealed, including the presence of a medio-apical notch, 70–80 small conical denticles and one pair of submedial pores on each lip, the absence of caudal alae, the presence of four pairs of postcloacal papillae, and a single, medio-ventral precloacal papilla.

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The authors wish to thank František Marec (Institute of Entomology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic) for providing the freshly dead host and František Moravec (Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic) for providing useful literature. We are also grateful to Dr. Hui-Xia Chen (Hebei Normal University, Shijiazhuang, China) for help with the illustrations. This study was supported by the National Natural Science Foundation of China (NSFC-31572231), Natural Science Foundation of Hebei Province (NSFH-C2016205088), the Youth Top Talent Support Program of Hebei Province for Liang Li, and the Institute of Parasitology (RVO: 60077344).

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Li, L., Scholz, T. Redescription of Porrocaecum semiteres (Zeder, 1800) (Nematoda: Ascaridida) from the Song Thrush Turdus philomelos (Passeriformes: Turdidae). Acta Parasit. 64, 1–6 (2019).

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  • Ascaridida
  • Bird
  • Porrocaecum
  • Morphology
  • Taxonomy
  • SEM