DefinePK

Abstract

The Greater Coucal (Centropus sinensis) is a widespread, non-migratory resident bird of Pakistan that inhabits diverse habitats, including agricultural landscapes and forested areas. Objectives: To describe a new species of Centrorhynchus from the Greater Coucal in Sindh, contributing to the knowledge of acanthocephalan diversity in Pakistan and the global taxonomy of the genus. Methods: Three Greater Coucals (Centropus sinensis) were collected through purposive sampling during routine avian surveys in Saleh Pat, Sukkur District, Pakistan.  Gastrointestinal tracts were dissected and screened under a stereomicroscope. Worms were relaxed in hot water, fixed in AFA, stained with borax carmine, dehydrated through graded ethanol, cleared, and mounted in Canada balsam. Line drawings (Olympus BH2-DA) and photomicrographs (OMAX 10 MP) were prepared. Diagnostic features were consistent across specimens. The approach aligns with established acanthocephalan taxonomy protocols, where complete specimens validate new species, and the study focused on description rather than ecological statistics. Results: Seven acanthocephalans were recovered from the intestines of two Greater Coucals (Centropus sinensis), representing a new species, Centrorhynchus saluni n. sp. Male measured 6.27–6.70 mm, and female 7.41–7.92 mm. Diagnostic features include specific proboscis and receptacle dimensions, cylindrical lemnisci longer than the receptacle, tandem to slightly oblique testes, six elongated cement glands, and a posterior bursa in male. Female possess a uterine bell with eggs measuring 0.075–0.085 × 0.030–0.038 mm. Conclusions: Centrorhynchus saluni n. sp., discovered in the Greater Coucal from Sindh, Pakistan, enhances knowledge of Centrorhynchidae diversity and introduces new diagnostic traits.