Observations on the morphology and morphogenesis of a new marine urostylid ciliate, Parabirojimia similis nov. gen., nov. spec. (Protozoa, Ciliophora, Hypotrichida)
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.
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: email@example.com 2: Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
Publication date: December 1, 2002