来源：市场资讯
（来源：juebukeyi）
清澈山间溪流的石头下，藏着一群长相特别的小甲虫，它们就是扁泥甲科（Psephenidae）昆虫，隶属于鞘翅目（Coleoptera）多食亚目（Polyphaga）。
Psephenus herricki
因为幼虫又圆又扁，趴在石头上像一枚迷你铜币，常被称为水硬币，是溪流里辨识度超高的小可爱。
Psephenus herricki
扁泥甲的一生很有“反差感”。幼虫全程生活在水里，身体扁扁圆圆的，像一片小盾牌，头和细腿都藏在宽大的背板下，看起来呆萌又安稳。它们不用浮出水面呼吸，腹部藏着细密的气管鳃，在水里就能轻松换气。
Psephenus herricki
平时它们紧紧扒在岩石上，慢悠悠刮食石头上的藻类，就算水流很急也冲不走。
长大变成成虫后，它们就离开水里，变成黑褐色的小圆甲虫。成虫寿命较短，进食很少，主要忙着繁衍后代，完成使命就匆匆结束一生。
Psephenus herricki
扁泥甲对水质特别挑剔，污水、脏水里活不下去，哪里有它们活跃，就说明那里的溪水干净清澈，是天然的“水质检测员”。
参考文献
LEE C H I F, Sato M, Shepard W D, et al. Phylogeny of Psephenidae (Coleoptera: Byrrhoidea) based on larval, pupal and adult characters[J]. Systematic Entomology, 2007, 32(3): 502-538.
Beutel R G. Phylogenetic analysis of Elateriformia (Coleoptera: Polyphaga) based on larval characters[J]. Journal of Zoological Systematics and Evolutionary Research, 1995, 33(3‐4): 145-171.
Barr C B, Shepard W D. A taxonomic review of the genus Psephenops Grouvelle of the Lesser Antilles with description of new species Psephenops trini, and reassignment of Peruvian species Psephenus robacki Spangler (Coleoptera: Psephenidae: Psepheninae)[J]. 2024.
McShaffrey D, McCafferty W P. The behaviour and form of Psephenus herricki (DeKay)(Coieoptera: Psephenidae) in relation to water flow[J]. Freshwater Biology, 1987, 18(2): 319-324.
Hinton H E. Respiratory adaptations of the pupae of beetles of the family Psephenidae[J]. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences, 1966, 251(771): 211-245.
参考图片
https://www.inaturalist.org/observations/308314724
https://www.inaturalist.org/observations/126850756
https://www.inaturalist.org/observations/120570542
https://www.inaturalist.org/observations/34612225
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