The marine ciliate Anigsteinia candida (Yagiu and Shigenaka, 1956) Isquith and Repak, 1974 has been redescribed and recorded from the Arabian Gulf for the first time since the original discovery from Hiroshima Bay in Japan. More detailed observarions and morphometric analysis of the Saudi population have been included, which matches in many aspects those of the Japanese population. It measures about 400 × 60 μm with an average length/width ratio of 7.3 : 1 (414 × 56 μm, ratio 7.5 : 1 for the original description); the 24-30 ciliary rows were found to be within the range of the Japanese population (22-27 rows); the 200-260 spherical to ellipsoidal beads of the macronucleus were also within the range of 181-287 in the Japanese population. The faintly yellowish cortical granules were found to be the only morphological difference from the originally described colorless granules.
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