Protistology 6 (1) 66–71 (2009)
Monocystis septum sp. n. (Protozoa: Apicomplexa: Monocystidae) from seminal vesicles of earthworms (Annelida: Oligochaeta) in West Bengal, India
Probir K. Bandyopadhyay, Adrita Chakraborty and Amlan Kumar Mitra
Parasitology Laboratory, Department of Zoology, University of Kalyani, Kalyani, West Bengal, India
As a part of the ongoing biodiversity survey of aseptate gregarines in earthworms, samplings were carried out in the Murshidabad district of the state of West Bengal (India). The survey revealed a new species of the genus Monocystis Stein, 1848, M. septum sp. n., in the earthworm host Eutyphoeus orientalis (Beddard). The gamonts of M. septum are rectangular, slightly tapering towards the anterior and the posterior end. The unique feature of the gamonts is the presence of a constriction at the anterior body end that tends to divide the cell into two parts, similarly to septate gregarines. The gamonts measure 86.3-102.3 μm (90.4± 4.2, 36) in length and 66.1-89.3 μm (78.2±0.9, 36) in width. The gametocyst consists of two gametocytes of unequal size and peculiar shape: one is axe-like, the other semicircular. The gametocysts measure 46.1-78.6 μm (64.2±1.2, 36) in length and 39.7-68.4 (62.4±1.8, 36) in width. Bi-conical oocysts measure 6.4-9.3 μm (8.2±0.9, 36) in length and 5.5-7.6 μm (6.1±2.1, 36) in width.
Key words: gregarines, earthworm, seminal vesicles, systematics, Monocystis septum sp. n.
Address for correspondence: Probir K. Bandyopadhyay. Parasitology Laboratory, Department of Zoology, University of Kalyani, Kalyani, 741235, West Bengal, India, e-mail: firstname.lastname@example.org
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