Re-investigation of Polyoeca dichotoma and Acanthoeca spectabilis (Acanthoecidae: Choanoflagellida)

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Abstract
Light and electron microscopical reinvestigation of P. dichotoma Kent revealed the Acanthoecopsis spiculifera Norris, the type species of the genus, is a synonym for P. dichotoma. Since this step invalidates the use of the name Acanthoecopsis, a new genus ACANTHOCORBIS was established for the 3 spp. formerly included in Acanthoecopsis, Acanthocorbis apoda comb. nov., A. unguiculata comb, nov. and A. assymetria comb. nov. The three dimensional arrangement of costal strips forming the loricae of P. dichotoma and Acanthoeca spectabilis Ellis were examined by scanning electron microscopy. The arrangement of costal strips were similar in both species. The longitudinal costal strips and those forming the spines were arranged outside the supplementary costae and those of the transverse bonds.