The remarkable holometabolan larva, Trialarva coburgensis gen. et sp. nov., is described from the Upper Triassic Hassberge Formation in Lower Franconia, southern Germany. It is the second described fossil larva of so-called “Sialidae-type” after the Middle Permian Kargalarva permosialis Prokin et al., to which it is morphologically close. The overall morphology of the new larva is best compatible with an interpretation as aquatic larva of beetle, which is strongly supported by the presence (and the first fossil record) of annular-biforous spiracles—the character unique for Coleoptera and suggested as a part of the coleopteran ground pattern.

杰出的holometabolan幼虫，Trialarva coburgensis gen。等。nov。，描述于德国南部下弗兰肯行政区的上三叠纪哈斯伯格组。这是继中二叠纪Kargalarva permosialis Prokin等之后的第二个被描述为“唾液虫型”的化石幼虫，在形态上与之接近。新的幼虫的整体形态与甲虫的水生幼虫的解释最相符，这由环状双孔形气孔的存在（和第一个化石记录）得到了有力支持-鞘翅目特有的性状，建议作为鞘翅目的一部分鞘翅目地面模式。