Investigations of type material and new material from the Philippines (Luzon) revealed that Baetis luzonensis Müller-Liebenau, 1982 and B. realonae Müller-Liebenau, 1982 do not belong to Baetis Leach, 1815. A new genus, Philibaetis gen. nov., is described to accommodate both species and both are re-described based on larvae. The new genus is characterised by having a rectangular labrum with a submarginal row of long, simple setae on the dorsal surface and ventrally on lateral margins long, simple, spine-like setae, on anterolateral margins long, feathered setae and medially long, bifid setae and a partial, submarginal row of lanceolate setae. Both mandibles have blade-like incisors and dorsally, a mediolateral patch of long, spine-like setae; additionally, the left mandible has a tuft of long, partly branched setae at the base of the subtriangular process. Philibaetis gen. nov. is further characterised by a hypopharynx with a medial tuft of stout setae and anterolaterally, two smaller tufts of stout setae, a galea-lacinia with the distal denti-seta tooth-like and directed against canines, a fore femur apically with stout setae, both on anterior and posterior side and without a femoral patch and a claw with one row of denticles and two or three subapical setae. The protogonostyli under the cuticle of male last instar larvae are folded in the Labiobaetis type, excluding their affiliation to the genus Baetis. COI sequences were obtained from both species. The genetic distance (Kimura 2-parameter) between them is 17.5% on average. Very limited genetic distances of 0% to 3% (0.75% on average) were found between specimens of P. luzonensis comb. nov.

中文翻译：

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Philibaetis gen。11月，菲律宾新属（蜉蝣科，蝙蝠科）

对菲律宾（吕宋岛）的类型材料和新材料的调查显示，Baetis luzonensis Müller-Liebenau，1982 和 B. realonae Müller-Liebenau，1982 不属于 Baetis Leach，1815。一个新属，Philibaetis gen。nov., 被描述为适应这两种物种，两者都根据幼虫重新描述。新属的特征是有一个长方形的唇，在背侧和腹侧的侧缘上有一排长而简单的刚毛，前外侧缘有长的、有羽毛的刚毛和中间长的、分叉的刚毛。和一排部分的、边缘的披针形刚毛。两个下颌骨都有刀片状的门牙和背侧，一个长的、脊柱状的刚毛的中间斑块；另外，左下颌有一簇长，部分分枝的刚毛在亚三角突起的基部。Philibaetis gen。十一月 进一步的特征是下咽部具有一簇粗壮的刚毛和前外侧的两簇较小的粗刚刚毛，一个具有远侧齿状刚毛齿状的帽状乳头状体，对着犬齿，前股骨顶部具有粗壮的刚毛，两者都是前后侧无股骨斑块，爪有1排小齿和2～3根尖下刚毛。雄性末龄幼虫表皮下的原性腺体折叠成唇形类，但不属于 Baetis 属。COI 序列是从两个物种中获得的。它们之间的遗传距离（木村 2 参数）平均为 17.5%。在 P. 的标本之间发现了 0% 到 3%（平均 0.75%）的非常有限的遗传距离。吕宋梳子。十一月