A DESCRIPTION OF <i>HAPLOZOON AXIOTHELLAE</i> N. SP., AN ENDOSYMBIONT OF THE POLYCHAETE <i>AXIOTHELLA RUBROCINCTA</i>¹²

Abstract

SUMMARY A new parasitic dinoflagellate, Haplozoon axiothellae sp. nov., is described from the intestine of the marine polychaete Axiothella rubrocincta. The parasites are 40–175 μm long with 2–26 cells arranged in single or double rows. Two cytoplasmic inclusions previously unknown in this genus are described. The first is globular and varies in size, while the second is approximately 2 μm long and peanut‐shaped. The function and composition of the inclusions are unknown. Nuclear structure and karyokinesis are apparently different from those of typical dinoflagellates.