The continuing exploration of the Mediterranean deep sea reveals that a complete census of the biodiversity of one of the most studied marine areas in the world is yet to be fully accomplished. A tritoniid nudibranch new to science is described upon material recovered off the Montenegro margin, Adriatic Sea, associated with the alcyonacean Primnoidae Callogorgia verticillata (Pallas, 1766). Here, a coral forest dominated by C. verticillata, together with other alcyonaceans, antipatharians and scleractinians, represents the habitat of the new species. As documented by Remotely Operated Vehicle (ROV) observations, the coral forest covers an area of 600 m² at 420–426 m depth, with dense growth of C. verticillata colonies (1.34 ± 0.08 colonies m⁻²). As many as 66 nudibranch specimens have been observed on C. verticillata. Tritonia callogorgiae sp. nov. (Gastropoda, Nudibranchia, Tritoniidae) is up to 12 cm long, yellow to orange/reddish in colour with white papillae all over the body. It has a velum with six appendages (three per side), and 4–5 pairs of dichotomous gills. Internally, the species is distinguished from other tritoniids for the absence of stomach plates and a distinctive radula with formula 50 × 110.1.1.1.108. It represents the first case of Tritonia species living in the deep Mediterranean Sea and the only one associated to C. verticillata. Stomach content documents that Tritonia callogorgiae sp. nov. feeds on C. verticillata. Further visual ROV records from other sectors of the Mediterranean Sea indicate that the distribution of this new described species is almost basin-wide. The discovery of another undescribed member of the benthic megafauna related to deep-sea coral grounds further highlights the need for conservation of such habitats.

对地中海深海的不断探索表明，对世界上研究最多的海域之一的生物多样性的全面普查尚未完全完成。在黑山亚得里亚海的边缘发现的与亚历古生物初生夜蛾Callogorgia verticillata有关的物质后，描述了一种新的科学的三角肌裸枝（Pallas，1766年）。在这里，一个由C. verticillata以及其他褐藻科，抗病菌和Scleractinians主导的珊瑚森林代表了新物种的栖息地。正如遥控车（ROV）观测所证明的那样，珊瑚森林 在420-426 m的深度上覆盖了600 m ²的区域，密植着轮生梭状芽胞杆菌。菌落（1.34±0.08菌落m ^-2）。在轮状衣藻（C. verticillata）上观察到多达66个裸udi的标本。Tritonia callogorgiae sp。十一月 （Gastropoda，Nudibranchia，Tritoniidae）长至12厘米，黄色至橙色/红色，全身遍布白色乳头。它有一个带有六个附肢（每侧三个）和4-5对二分g的贴膜。在内部，由于没有胃板和具有公式50×110.1.1.1.108的独特的小舌，该物种与其他tritoniid区别开来。它代表了生活在地中海深处的Tritonia物种的第一例，也是唯一与轮枝梭菌有关的物种。胃内容证明Tritonia callogorgiae sp。十一月 以褐线藻为食。地中海其他地区的进一步可视ROV记录表明，这种新描述物种的分布几乎遍布整个盆地。与深海珊瑚礁有关的底栖大型动物的另一个未被描述的成员的发现进一步突出了对这种栖息地的保护的需要。