title: Description of Rhynchocystis silvae sp. nov (Apicomplexa: Eugregarinida) from Metaphire peguana Rosa (1890) of Dhaka, Bangladesh.
abstract: OBJECTIVE
  Biodiversity studies in search of endoparasitic acephaline gregarines of earthworms revealed a new species under the genus Rhynchocystis Hesse, 1909.
  
  
  METHODS
  The species has been obtained from the seminal vesicles of the earthworm, Metaphire peguana. The parasite was identified using standard methodology.
  
  
  RESULTS
  Gamonts are solitary, elongated with a conical, enlarged head and blunt posterior end. The mature gamont measures 419.90- 430.95 (425.05±4.70) μm in length and the width at the widest portion is 44.2-50.83 (47.88±2.85) μm and 15.47-17.68 (16.50±1.14) μm in the posterior end. The nucleus is elongated and positioned at the posterior end. The nucleus measures 17.68-22.01 (19.74±1.95) μmx11.05- 15.47 (13.40±1.95) μm. The measurement of the mucron is 13.26-17.68 (15.47±1.86) μmx17.68-22.1 (19.44±1.71) μm. Gametocysts are ovoid with two unequal sized gametocytes. The gametocyst measures 95.03-97.24 (96.20±1.14) μmx77.35-81.77 (79.56±1.86) μm. Large and small gametocytes measure 57.46-61.88 (59.81±1.76) μmx70.72-75.14 (72.48±1.71) μm and 30.94-37.57 (34.47±2.74) μmx61.88-66.3 (64.38±1.84) μm respectively. Oocysts are biconical, measuring 11.05-15.47 (12.81±1.71) μmx6.63-8.84 (7.70±1.20) μm.
  
  
  CONCLUSIONS
  A new gregarine parasite species is described.
authors.affiliation: Department of Zoology, University of Kalyani, West Bengal, India.
authors.forename: Sutapa
authors.initials: S
authors.lastname: Sarkar
authors.forename: Probir K
authors.initials: PK
authors.lastname: Bandyopadhyay
authors.forename: Bayram
authors.initials: B
authors.lastname: Göçmen
mesh_terms: D000818:Animals; D016782:Apicomplexa / Q000145:classification* / Q000254:growth & development / Q000648:ultrastructure; D001459:Bangladesh; D044822:Biodiversity; D002467:Cell Nucleus / Q000648:ultrastructure; D008018:Life Cycle Stages; D008297:Male; D009835:Oligochaeta / Q000469:parasitology*; D033661:Oocysts / Q000648:ultrastructure