Abstract
The morphology and infraciliature of Orthodonella sinica n. sp. and Apokeronopsis wrighti n. sp., isolated from the coastal water off Hong Kong, were investigated in living and stained specimens. Orthodonella sinica n. sp. is diagnosed as: a marine Orthodonella 150-310 x 40-80 microm in vivo; with a dominant beak-like projection at the anterior end; about 70 somatic kineties; 84-126 dikinetids in the synhymenium; one contractile vacuole in the posterior one-fourth of cell, near the left margin; one conspicuous dorsal suture. Apokeronopsis wrighti n. sp. is diagnosed as: an Apokeronopsis about 150-230 x 35-55 microm in vivo; dark-reddish blood-cell-shaped cortical granules grouped in three rows on the ventral side and two rows on the dorsal side; 23-35 cirri in the right mid-ventral rows (MVR) and 23-32 cirri in the left MVR; six to eight buccal, two frontoterminal, 30-42 left marginal, and 32-43 right marginal cirri; 21-30 transverse cirri extending anteriorly beyond the level of mid-body; consistently three dorsal kineties. The separation of A. wrighti n. sp. and its highly similar congeners Apokeronopsis crassa and Apokeronopsis bergeri was supported by comparison of their SSrRNA gene sequences.
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