Gangliostoma Xu, 1983

Guo, Donghui, Xu, Zhenzu, Huang, Jiaqi, Wang, Chunguang & Lin, Mao, 2019, Two new hydrozoan species from the Taiwan Strait, China (Cnidaria: Hydrozoa: Leptothecata), Zoological Systematics 44 (3), pp. 185-190 : 186

Genus Gangliostoma Xu, 1983

Type species: Gangliostoma guangdongensis Xu, 1983 .

Diagnosis. The genus is diagnosed by following: medusa with many simple radial canals; subumbrella without radial rows of gelatinous papillae; manubrium with radial rows of gelatinous papillae.

Remarks. It comprises three species: G. dayaensis Xu, Huang & Du, 2010 , G. guangdongensis Xu, 1983 and G. abaxialispura Xu, Huang & Guo , sp. nov., which are known in China seas.

Key to the species of the genus Gangliostoma .

1. Oral lips longish, about same number as the radial canals; with 90–108 marginal tentacles, about 2–3 times as many as the number of radial canals; tentacular bulbs without excretory papillae and abaxial spurs; without rudimentary bulbs ( Fig. 4 ) ............................ ............................................................................................................................................................... G. guangdongensis Xu, 1983 Oral lips short, less numerous than the radial canals; marginal tentacles much less than 1 time as many as radial canals ..................2

2. With 12–14 marginal tentacles, tentacular bulbs with distinct excretory papillae, no abaxial spurs; with 3 rudimentary bulbs between tentacles ( Fig. 5 )......................................................................................................................... G. dayaensis Xu, Huang & Du, 2010 With 8 marginal tentacles, tentacular bulbs with a distinct abaxial spurs, no excretory papillae; with 6 rudimentary bulbs between tentacles ( Fig. 3 )........................................................................................................... G. abaxialispura Xu, Huang & Guo , sp. nov.

Figures

Figures 1–5. Gangliostoma spp. 1–3. G. abaxialispura Xu, Huang & Guo, sp. nov. 1. Oral view. 2. Lateral view. 3. Part enlargement of marginal tentacles. 4. Part enlargement of the subumbrella of G. dayaensis Xu, Huang & Du, 2010 (after Du et al., 2010). 5. Part enlargement of the subumbrella of G. guangdongensis Xu, 1983 (after Xu, 1983). Abbreviation: p—papilla; g—gonad; t—tentacle. Scale bars=2.0mm.