Four new species of the scaleless black dragonfish genus Eustomias are described based on specimens collected during the ABRACOS (Acoustics along the BRAzilian COaSt) expeditions along the Fernando de Noronha Ridge, off northeastern Brazil, western tropical Atlantic. Eustomias (Haploclonus) antea sp. nov. differs from its congeners by having a long chin barbel without appendages, ending in a very small terminal bulb without terminal filaments. Eustomias (Haploclonus) lucenae sp. nov. has the lowest count of photophores in the lateral series (56) and a simple, short barbel, ending in a small and asymmetrical terminal bulb. Eustomias (Nominostomias) ophioglossa sp. nov. differs from its congeners by the long chin barbel with two terminal bulbs and long terminal filament with bifurcated axis along its length and with bulblets of different sizes and arrangements inside. Eustomias (Nominostomias) bertrandi sp. nov. can be distinguished by the long chin barbel with two terminal bulbs, the distal bulb more than twice as long as the proximal one, and a short terminal filament. Morphological description of a specimen identified as Eustomias (Dinematochirus) cf. minimus is provided, and an overview of the species of Eustomias reported in Brazilian waters is presented and discussed.

中文翻译：

---

来自热带大西洋西部的四种龙鱼属 Eustomias（Stomiiformes：Stomiidae：Melanostomiinae）新种，以及对 Eustomias minimus Clarke 的评论，1999 年

根据沿巴西东北部、热带大西洋西部的费尔南多·迪诺罗尼亚山脊进行 ABRACOS（巴西海岸声学）探险期间收集的标本，描述了无鳞黑龙鱼属 Eustomias 的四个新种。Eustomias (Haploclonus) antea sp. 十一月 与同类不同的是，它有一个长下巴触须，没有附属物，末端有一个非常小的末端灯泡，没有末端细丝。Eustomias (Haploclonus) lucenae sp. 十一月 在侧向系列中具有最低数量的发光体（56）和简单而短的触须，末端有一个小且不对称的终端灯泡。Eustomias (Nominostomias) ophioglossa sp. 十一月 与同类的不同之处在于长下巴触须有两个末端球茎和长末端细丝，沿其长度有分叉轴，内部有不同尺寸和排列的小球茎。Eustomias (Nominostomias) bertrandi sp. 十一月 可以通过具有两个末端球的长下巴触须来区分，末端球的长度是近端球的两倍以上，并且末端丝很短。被鉴定为 Eustomias (Dinematochirus) 的标本的形态学描述 cf. 提供了 minimus，并对巴西水域报告的 Eustomias 物种进行了概述并进行了讨论。