北京
來源：市場資訊
（來源：juebukeyi）
清澈山間溪流的石頭下，藏著一群長相特別的小甲蟲，它們就是扁泥甲科（Psephenidae）昆蟲，隸屬于鞘翅目（Coleoptera）多食亞目（Polyphaga）。
Psephenus herricki
因為幼蟲又圓又扁，趴在石頭上像一枚迷你銅幣，常被稱為水硬幣，是溪流里辨識度超高的小可愛。
Psephenus herricki
扁泥甲的一生很有“反差感”。幼蟲全程生活在水里，身體扁扁圓圓的，像一片小盾牌，頭和細腿都藏在寬大的背板下，看起來呆萌又安穩。它們不用浮出水面呼吸，腹部藏著細密的氣管鰓，在水里就能輕松換氣。
Psephenus herricki
平時它們緊緊扒在巖石上，慢悠悠刮食石頭上的藻類，就算水流很急也沖不走。
長大變成成蟲后，它們就離開水里，變成黑褐色的小圓甲蟲。成蟲壽命較短，進食很少，主要忙著繁衍后代，完成使命就匆匆結束一生。
Psephenus herricki
扁泥甲對水質特別挑剔，污水、臟水里活不下去，哪里有它們活躍，就說明那里的溪水干凈清澈，是天然的“水質檢測員”。
參考文獻
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.
參考圖片
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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