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黄缘萤（学名：Aquatica ficta）[1]是萤科的一个物种，因在两片翅鞘间有淡黄色边纹，故名为黄缘萤[2]。本物种栖息于静止的水域，其幼虫亦是水生[2]。
本物种在1909年被Ernest Olivier描述之时叫作Luciola ficta，属于熠萤属[3]，模式产地位于清朝时的贵州贵西道安顺府安平县[4]。2010年，傅新华、Ballantyne及Lambkin将本物种及另外三个同属物种移往新建立的水萤属（Aquatica）[5][6]。
本物种有着细长的身体，体长7—11 mm（0.28—0.43英寸），宽3—4 mm（0.12—0.16英寸）[4] 雄虫及雌虫的颜色均一样：前胸背板橙黄色；翅鞘深褐色[5]。两翅中央接合处呈黄色细条纹。雄虫雌虫外观相近，但雄虫复眼较大；且雄虫腹部发光节二节，雌虫发光节一节。其腿部 have yellowish brown femora. The venter is yellowish brown and dark brown. The male has an oblong 插入器 sheath, around 2.0 mm（0.079英寸） long, and elongate and subparallel genitalia[4]。 The larva has gills and glands that secrete protective substances.[7]
本物种见于大中华地区的贵州、香港、福建及台湾。常见于静止的水域及米田，而幼虫偏好泥质的底质[4]。成虫整年可见，台湾最常见于4月及8月[4]。生活在海拔1000米以下的截流水田或田沟环境附近。成虫夜行，和一般萤火虫相同，平时并不觅食，但会以露水解渴。
尽管黄缘萤的幼虫亦是水生，但它们并不会游泳，而是只能够在水底下爬行[5]。 They go through six instars. They eat small invertebrates and carrion. The larvae probably burrow in mud during dry periods. 成虫的光为黄绿色。The males fly to look for mates while the females usually do not fly, remaining on the ground. About 100 eggs are laid on moist soil or plants[4]。In one experiment, the life cycle was completed in about 120 days[4]。 A 2010 study recorded about 390 days, the larval stage spanning about 330 days.[8]
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