Sea pen species of the genus Calibelemnon are important components of soft bottom communities. Here, we formally describe Calibelemnon hinoenma sp. nov. from shallow waters in Amami Oshima, Kagoshima in the Ryukyu Islands, via molecular and morphological observations and analyses. This species can be distinguished from its congeners by the presence of paired autozooids, siphonozooids aligned irregularly in one to three rows at the side of the rachis between polyps, and the red-brown rufous color of the oral disks. Phylogenetically, the new species is located in an Anthoptilum–Umbellula–Calibelemnon clade. Ancestral state reconstruction analyses suggest that Calibelemnon species may have undergone at least two habitat changes, from shallow to deep waters, followed by a return to shallow waters. In the Ryukyu Islands, there have been many recent discoveries of unique marine species, with this sea pen species being the latest.

Calibelemnon属的海笔物种是软底群落的重要组成部分。在这里，我们正式描述Calibelemnon hinoenma sp.。十一月 来自琉球群岛鹿儿岛Am美大岛Am美大岛浅水区的分子和形态观察与分析。该物种与同类动物的区别在于，存在成对的类胡萝卜素，在息肉之间的棘突侧不规则地排列成一到三排的虹吸类动物以及口腔盘呈红褐色的红褐色。从系统发育上看，新物种位于Anthoptilum – Umbellula – Calibelemnon进化枝中。祖先状态重建分析表明，Calibelemnon该物种可能经历了至少两次生境变化，从浅水到深水，然后又返回浅水。在琉球群岛上，最近发现了许多独特的海洋物种，其中最新的是海笔物种。