Abato Jamael, Yoshida Ryuta, Kajihara Hiroshi
Graduate School of Science, Hokkaido University, Sapporo 060-0810, Japan. Biology Department, Mindanao State University, Marawi City 9700, Philippines..
Tateyama Marine Laboratory, Institute for Marine and Coastal Research, Ochanomizu University, Kouyatsu, Tateyama, Chiba 294-0301, Japan..
Zootaxa. 2023 Mar 6;5249(5):589-597. doi: 10.11646/zootaxa.5249.5.6.
We provide a morphological and molecular-based description of the eumonostiliferous hoplonemertean Oerstedia fuscosparsa sp. nov. based on two specimens dredged from a depth between 11 and 18 m off Kouyatsu, Tateyama, Chiba, Japan. This Oerstedia differs from its congeners by having a deep brownish pigmentation in the head, four orange ocelli, and imprecise dorsal and ventral transverse bands composed of numerous small brown spots. One of the specimens, herein designated as the holotype, has deep brown spots situated mid-dorsally onto the transverse bands running throughout the body. These dorsal markings are absent in the other specimen designated as a paratype. Internally, the species has accessory lateral nerves, and the proboscis nerves are not distinct. Molecular phylogenetic analyses based on partial sequences of the 16S, 18S, 28S rRNA, cytochrome c oxidase subunit I, and histone H3 gene markers along with the sequences from 22 Oerstedia species available in public databases confirmed that our species is sister to Oerstedia phoresiae (Kulikova, 1987) and belongs to the recently established Paroerstediella clade within the genus Oerstedia.
我们基于形态学和分子学，对单吻棘吻虫新物种Oerstedia fuscosparsa进行了描述。该物种基于从日本千叶县馆山市小矢部外海11至18米深处采集的两个标本。这种Oerstedia与同属其他物种的区别在于，其头部有深褐色色素沉着，有四个橙色眼点，以及由许多小褐色斑点组成的不精确的背腹横向带。其中一个标本，在此指定为正模标本，在贯穿全身的横向带上有位于背中部的深褐色斑点。在指定为副模标本的另一个标本中没有这些背侧斑纹。在内部结构上，该物种有副侧神经，吻神经不明显。基于16S、18S、28S rRNA、细胞色素c氧化酶亚基I和组蛋白H3基因标记的部分序列以及公共数据库中22种Oerstedia物种的序列进行的分子系统发育分析证实，我们的物种是Oerstedia phoresiae（Kulikova，1987）的姐妹种，属于最近在Oerstedia属内建立的Paroerstediella分支。
