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1985年侯连海初步报告了发现于云南禄丰中新世古猿地点的部分鸟类化石,建立了一新种石灰坝潜鸭(Aythya shihuibas),并将另一件标本定为河鸭属未定种(Anas sp.)。针对这两件鸭类标本保存的特征进行系统发育分析,并结合二者目前已知的分布情况,可以确定禄丰鸟类至少存在两个不同种(不同的系统发育支系),这和之前的结论相似。石灰坝潜鸭的肱骨腹侧气窝中具有骨质支柱,异于现生潜鸭类,代表了气窝演化的较原始形态,依此认为其很可能为一潜鸭类冠群以外的绝灭支系。另一件原命名为Anas p.的鸭类标本保存非常破碎,无法对其进行较精确的系统发育分析。它很可能为鸭科成员,或许可以称为河鸭类,尽管此属(Anas)为非单系类群。这件禄丰河鸭类标本可能与发现于蒙古中新世-上新世的另一河鸭属未定种关系较近,二者具有相似的特殊特征组合。
In 1985, Hou Lianhai initially reported part of the bird fossils found in the Middle Pleistocene ape in Lufeng, Yunnan Province. A new species of Aythya shihuibas was established and another was designated as undetermined Anas sp.). According to the phylogenetic analysis of the preserved characteristics of these two duck specimens and the current known distribution of the two species, it is possible to confirm that there are at least two different species (different phylogenetic branches) of Lufeng birds, The conclusion is similar. The lime dam has the bone pillars in the ventral fossa of the humerus, which is different from the existing potential ducks and represents the primitive form of gas evolution. Therefore, it is considered that it is likely to be a Off the branch. Another duck specimen, originally named Anas p., Was very fragmented and inaccurate for its phylogenetic analysis. It is likely to be members of the family Duck, perhaps referred to as river ducks, although this family (Anas) is a non-monophyletic group. The Dufeng samples of the Lufeng River may be closer to the undetermined species found in the Miocene-Pliocene of Mongolia, with similar combinations of special features.