The larva of Psaironeura is formally described for the first time, based upon reared specimens of Psaironeura angeloi from the Tirimbina Biological Reserve, Sarapiquí, Heredia Province, Costa Rica. Detailed illustrations are also provided. The larva is characterized by a slender dark brown body, premental setae 2+1, six palpal setae, male cerci globose, and caudal lamellae markedly slender, 3.5–4 times longer than wide, with tips bi- or trilobated.

中文翻译：

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对 Psaironeura 幼虫的首次描述，基于来自哥斯达黎加的 P. angeloi 标本（Odonata：Coenagrionidae：Protoneurinae），其中包含中美洲 Protoneurinae 属的关键

根据哥斯达黎加埃雷迪亚省萨拉皮基蒂林比纳生物保护区饲养的 Psaironeura angeloi 标本，首次正式描述了 Psaironeura 幼虫。还提供了详细的插图。幼虫的特征是细长的深棕色身体，前颏刚毛2+1，6个触须刚毛，雄性尾尾球状，尾鳞明显细长，比宽长3.5-4倍，尖端为双叶或三叶。