The hydrophilid genus Cycreon Orchymont, 1919, previously known from two historical specimens only, is reviewed based on the numerous material collected recently from the inflorescences of various Araceae species in the Malay Peninsula and Borneo. Four species are recognized in the genus: C. sculpturatus Orchymont, 1919 from Sumatra, C. armandi Shatrovskiy, 2017 from Singapore, C. adolescens sp. n. from peninsular Malaysia, and C. floricola sp. n. with two subspecies, the nominotypical one from Peninsular Malaysia, and C. floricola borneanus subsp. n. from Borneo. All species are very similar, differing only by the pronotal punctation, shape of the clypeus and the mentum, and the form of the median lobe of the aedeagus. Specimens of C. floricola sp. n. and C. adolescens sp. n. were collected from inflorescences of various genera of the family Araceae. The field observations and analysis of mid gut contents indicates that they feed on organic material on internal organs of the inflorescences, including the pollen of the host plant. They were also observed to carry a large amount of pollen and are likely pollinators of their host species of Araceae.

中文翻译：

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花栖水清道夫甲虫属 Cycreon（鞘翅目，亲水科）的综述，包括对新物种的描述和对其生物学的评论

亲水属 Cycreon Orchymont，1919 年，以前仅从两个历史标本中得知，根据最近从马来半岛和婆罗洲的各种天南星科物种的花序收集的大量材料进行了审查。该属共有四个物种：C. sculpturatus Orchymont，1919 年来自苏门答腊，C. armandi Shatrovskiy，2017 年来自新加坡，C. adolescens sp。n. 来自马来西亚半岛和 C. floricola sp。n. 有两个亚种，来自马来西亚半岛的命名型亚种和 C. floricola Borneanus subsp。n. 来自婆罗洲。所有物种都非常相似，不同之处仅在于前节点、唇和颏的形状以及 aedeagus 中叶的形式。C. floricola sp. 的标本。n. 和 C. adolescens sp。n. 从天南星科不同属的花序中收集。对中肠内容物的实地观察和分析表明，它们以花序内部器官上的有机物质为食，包括寄主植物的花粉。还观察到它们携带大量花粉，很可能是天南星科宿主物种的传粉者。