The egg structures of five antarctoperlarian species – Stenoperla prasina of Eustheniidae; Austroperla cyrene of Austroperlidae; and Zelandobius truncus, Megaleptoperla grandis, and Acroperla trivacuata of Gripopterygidae, were examined in detail, and the groundplan of the egg structure was considered within the representative lineages of Antarctoperlaria and Plecoptera. The flattened egg shape and the circular arrangement of micropyles along the equator are regarded as potential autapomorphies for not only Eustheniidae but also for Eusthenioidea. Austroperlidae has eggs with thin, less-sclerotized chorion, a gelatinous layer on the surface, and micropyles roughly and randomly arranged along the equator. A significant ultrastructural difference between the attachment disc in Gripopterygidae and the anchor plate of arctoperlarian Systellognatha suggests that these structures were independently derived. The thin less-sclerotized chorion represents a groundplan feature in Plecoptera, along with micropyles arranged in a circle, including those circularly arranged along the equator of the egg. On the other hand, in contrast to previous understanding, the sclerotized hard chorion is regarded as a derived feature, having been independently acquired in each of Eustheniidae and Gripopterygidae of Antarctoperlaria and Systellognatha of Arctoperlaria.

五种南极珊瑚物种的卵结构 - Eustheniidae 的 Stenoperla prasina；Austroperla cyrene of Austroperlidae; 和Zelandobius truncus、Megaleptoperla grandis和Acroperla trivacuata对 Gripopterygidae 进行了详细检查，并在 Antarctoperlaria 和 Plecoptera 的代表性谱系中考虑了卵结构的平面图。扁平的蛋形和沿赤道的圆形排列的微孔不仅被认为是 Eustheniidae 的潜在自体异种，也被视为 Eusthenioidea 的潜在自体。Austroperlidae 的卵具有薄的、较少硬化的绒毛膜，表面有一层胶状层，微孔沿赤道粗略随机排列。Gripopterygidae 的附着盘和 Arctoperlararian Systellognatha 的锚板之间的显着超微结构差异表明这些结构是独立衍生的。薄的较少硬化的绒毛膜代表了 Plecoptera 的基本特征，以及排列成圆形的微孔，包括沿鸡蛋赤道呈圆形排列的那些。另一方面，与先前的理解相反，硬化的硬绒毛膜被认为是派生特征，在南极洲的 Eustheniidae 和 Gripopterygidae 和 Arctoperlaria 的 Systellognatha 中分别独立获得。