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Observations on the morphology and morphogenesis of a new marine urostylid ciliate, Parabirojimia similis nov. gen., nov. spec. (Protozoa, Ciliophora, Hypotrichida)

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The morphology, infraciliature and morphogenesis of the hypotrichous ciliate, Parabirojimia similis nov. gen., nov. spec., collected from scallop-culturing waters off Qingdao (Tsingtao), China, are described using living observations and protargol silver impregnation. The new genus Parabirojimia is characterized thus: Urostylidae with clearly differentiated frontal cirri; buccal and transverse cirri present, caudal and frontoterminal cirri absent; one left and several right rows of marginal cirri, which derive from individual anlagen within each parental row; transverse cirri originate within fronto-ventral-transverse cirral anlagen and part of right marginal cirral anlagen. The diagnosis for Parabirojimia similis nov. spec. is as follows: in vivo 140–300 × 30–50 μm, elongated elliptical body outline; 5–8 right marginal rows; adoral zone of membranelles composed of 37–54 membranelles, bipartite with a snout-like protrusion of the frontal field between the anterior and posterior portions; 3 enlarged frontal, 7–13 midventral, 1 buccal and 3–11 transverse cirri; usually 1 ventral row composed of 15–56 cirri; usually with 3 complete dorsal kineties; 3–6 macronuclear nodules and about 3–8 micronuclei; marine habitat. The main features of divisional morphogenesis are: 1) the parental structure of the oral apparatus is partly renewed in the proter; 2) each parental marginal cirral row develops 2 separate anlagen intrakinetally; 3) transverse cirri are derived from the fronto-ventral-transverse cirral anlagen and part of right marginal cirral anlagen; 4) each parental dorsal kinety forms 2 separate anlagen intrakinetally.
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Keywords: Ciliophora; Morphogenesis; Morphology; Parabirojimia similis nov. gen., nov. spec.

Document Type: Original Article

Affiliations: 1: Laboratory of Protozoology, College of Fisheries, Ocean University of Qingdao, Qingdao 266003, P. R. China; Tel./Fax: +86: 532 203 2283; E-mail: wsong@ouqd.edu.cn 2: Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK

Publication date: 2002-12-01

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