Miyamoto Norio, Nishikawa Teruaki, Namikawa Hiroshi
X-STAR, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan,
Faculty of Science, Toho University, Miyama 2-2-1, Funabashi, Chiba 274-8510, Japan.
Zoolog Sci. 2020 Feb;37(1):79-90. doi: 10.2108/zs190010.
We describe here a new pterobranch, sp. nov. This pterobranch was collected from rocky slopes, at 100-300 m depth, off Jogashima Island, Sagami Bay, Japan. The tubaria of this new species have unique morphological features that differentiate it from known species. The tubaria are usually isolated from one another and have a completely flat and smooth surface that is devoid of erect features and projecting spines. Each has a simple, non-branched tubular cavity that is usually inhabited by a mature animal and its asexually budding offspring. The zooids have three pairs of tentaculated arms. A single bud is produced on the dorsal side of the stalk in adult zooids. In one instance, a live embryo was observed rotating at the bottom of a tubarium. Molecular phylogenetic analysis showed that is a sister group to all other species analyzed to date.
我们在此描述一种新的羽鳃类动物，新物种。该羽鳃类动物采集于日本相模湾城岛外100 - 300米深处的岩石斜坡。这种新物种的管状体具有独特的形态特征，使其有别于已知物种。管状体通常彼此分离，表面完全平坦光滑，没有直立特征和突出的刺。每个管状体都有一个简单的、无分支的管状腔，通常居住着一只成熟个体及其无性出芽的后代。游动孢子有三对带触手的臂。成年游动孢子的柄部背侧会产生单个芽体。有一次，观察到一个活胚胎在一个管状体内底部旋转。分子系统发育分析表明，它是迄今为止分析的所有其他羽鳃类物种的姐妹群。
