Apicomplexa is a phylum that includes all parasitic protozoa sharing unique ultrastructural features. Haemogregarines are sophisticated apicomplexan blood parasites with an obligatory heteroxenous life cycle and haplohomophasic alternation of generations. Haemogregarines are common blood parasites of fish, amphibians, lizards, snakes, turtles, tortoises, crocodilians, birds, and mammals. Haemogregarine ultrastructure has been so far examined only for stages from the vertebrate host. PCR-based assays and the sequencing of the 18S rRNA gene are helpful methods to further characterize this parasite group. The proper classification for the haemogregarine complex is available with the criteria of generic and unique diagnosis of these parasites.

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Studies on the anuran blood parasites of sub-Himalayan West Bengal, India.

Haemogregarines and Criteria for Identification

Micro-haematotechniques (hanging drop preparations, microhaematocrit, permanent smears) on blood of Bufo melanostictus revealed 210 % prevalence of Trypanosoma bisalpurensis n sp (intensity 10–20/100 RBCs) and Hepatozoon gangwarii n sp (intensity 10–30/100 RBCs) The permanent preparations of the parasites were cyto-morpho-taxonomically compared with the previously described forms The characteristic ‘S’-shaped body, the unusual close proximity of the nucleus and kinetoplast, the slender and elongated body and a shortened free flagellum of the Trypanosoma species and the differential size, nuclear position and dimensions, nuclear displacement ratio, absence of capsule and gametocyte characteristics of Hepatozoon are regarded as novel identity of the parasites and are being reported as new species with specific characters as provided in this communication The displacement of the host nucleus is consequential due to Hepatozoon infection and is also described herein

Studies on the anuran blood parasites of sub-Himalayan West Bengal, India.

Citations

Haemogregarines and Criteria for Identification

Infectivity of Bufo melanostictus (Amphibia: Bufonidae) to Two New Species of Haematozoan Parasites from Rohilkhand, India

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