Containing 51 extant genera and over 300 species, the family Caryophylliidae Dana, 1846 is reported from Antarctica to the Arctic, ranging from shallow to deep waters. Even though most caryophylliids are solitary, the majority of the most extensive deep-water reefs have their main engineers in colonial representatives of this family. However, several of these colonial species are small-sized and are usually found in shallow waters. Based on a study of colonies collected during scuba diving at Alcatrazes Archipelagos’ main island (São Paulo State) and Ilha Rasa (Rio de Janeiro), Brazil, a new species belonging to the genus Coenocyathus Milne Edwards & Haime, 1848 is described as C. sebroecki sp. nov. The species identity and its phylogenetic position within the Caryophylliidae could be distinguished by using morphological and genetic data. Also, the description of the cnidom of this species and remarks on its biology are provided, as well as a brief discussion on the polyphyly of the Caryophylliidae and an identification key for all extant Coenocyathus species.

中文翻译：

---

Coenocyathus sebroecki sp。十一月：来自巴西东南部的一种新的偶氮黄花珊瑚（Scleractinia，Caryophylliidae）

Caryophylliidae Dana家族现存51个属，超过300种，据报道，从南极到北极，从浅水到深水域，1846年生。尽管大多数石竹科植物都是单生的，但大多数最广泛的深水珊瑚礁的主要工程师都在该家族的殖民地代表中。但是，这些殖民地物种中有几种是小型的，通常在浅水区发现。根据对在恶魔群岛群岛主岛（圣保罗州）和伊利亚·拉萨（里约热内卢）的水肺潜水过程中收集到的菌落的研究，1848年属于Coenocyathus Milne Edwards＆Haime属的新物种称为C。塞布罗基sp。十一月 可以通过形态学和遗传学数据来区分石竹科中的物种身份及其系统发育位置。此外，还提供了对该物种的无脊椎动物的描述及其生物学说明，并对石竹科的多科性和所有现存的Coenocyathus物种的识别码进行了简要讨论。