Bougainvilliidae Lütken, 1850

Wang, Xuefeng, Lu, Liyi, Zhang, Shenzeng, Lin, Linkun, Xu, Zhenzu, Guo, Donghui & Huang, Jiaqi, 2021, Two new species of hydromedusa (Cnidaria) from the Leizhou Bay, the northern South China Sea, Zoological Systematics 46 (3), pp. 193-199 : 194

Family Bougainvilliidae Lütken, 1850

Bougainvilleae Lütken, 1850: 29–30.

Bougainvilliidae Allman, 1876: 252 ; Bouillon et al., 2006: 126–127; Schuchert, 2007: 196–198; Xu et al., 2014: 200–201; Guo et al., 2018: 99; Wang et al., 2019: 192.

Diagnosis. Medusa bell-shaped; mouth circular; simple or dichotomously branched oral tentacles distinctly inserted above mouth rim, with nematocyst clusters in end; four radial canals and one circular canal present; marginal tentacles single or clustered by 4, 8, or 16 tentacular bulbs; gonads circled around manubrium, or present in adradial, interradial or perradial position; adaxial ocelli absent or present.

Remarks. For the taxonomic systems and history of this family see Bouillon et al. (2006), Schuchert (2007) and Guo et al. (2018).

At present time, the family Bougainvilliidae comprise nine medusa genera: Bougainvillia Lesson, 1830 , Chiarella Maas, 1897 , Koellikerina Kramp, 1939 , Nemopsis L. Agassiz, 1849 , Nubiella Bouillon, 1980 , Pachycordyle Weismann, 1883 , Paranubiella Xu, Huang & Lin, 2018 , Silhouetta Millard & Bouillon, 1973 , Thamnostoma Haeckel, 1879 . A key to these genera is provided by Guo et al. (2018).