Sarsia tubulosa, M. Sars, 1835

Wang, Xiao, Chen, Xiao-Yin & Xu, Zhen-Zu, 2022, Two new species and four new records of the Sarsia tubulosa group of Sarsia (Cnidaria, Corynidae) from the Bohai Sea of China, Zootaxa 5189 (1), pp. 243-254 : 247-248

TABLE 1 Key to medusa of all known species of the Sarsia tubulosa group

1a Subumbrella pointed

2a Bell height> 12 mm, with thin, often branched apical canal........................... Sarsia princeps ( Haeckel, 1879)

2b Bell height <12 mm, with high conical apical knob 3a Bell top rounded; manubrium has short, thick serpentine part and distal, large, long spindle-shaped stomach, about 2/3 of manubrium; tentacular bulbs large, gastrodermal chambers shallow, epidermal parts high with uniform thickness....................................................................... Sarsia macrogastera Xu, Chen, & Wang sp. nov. 3b Bell top pointed; manubrium has long, thin serpentine part and distal swollen stomach, about 1/5 of manubrium; tentacular bulbs small, gastrodermal chambers high with low epidermis, not with uniform thickness................................................................................................ Sarsia apicula (Murbach & Shearer, 1902)

1b Subumbrella rounded

4a Medusa has angular subumbrella pockets at apex, exumbrella with interradial and perradial furrows.................................................................................................. Sarsia striata Edwards, 1983

4b Medusa lacking angular subumbrella pockets 5a Gonad-free portion of proximal manubrium shorter than subumbrella height

6a Proximal section of manubrium not distinct, very short 7a Bell top rounded, jelly rather thin with uniform thickness, exumbrella contains scattered nematocysts, lacking exumbrella furrows...................................................................... Sarsia occulta ( Edwards, 1978) 7b Bell top pointed, jelly thick, very thick at apex, exumbrella with interradial furrows........ Sarsia piriforna Edwards, 1983

6b Proximal section of manubrium distinct, long <1/2 subumbrella height 8a Gonad-free part of manubrium short, about 1/6 of manubrium, exumbrella with interradial furrows, colors of bulbs and apical knob highly variable........................................................... Sarsia tubulosa (M. sars, 1835) 8b Gonad-free part of manubrium long, about <1/2 of manubrium, exumbrella without interradial furrows, colors of bulbs and apical knob intense green................................................ Sarsia viridis ( Brinckmann-Voss, 1980)

5b Gonad-free portion of proximal manubrium longer than subumbrella height 9a Gonad covering serpentine part of manubrium short, about 1/6 of manubrium; manubrium contains thick, spindle shaped stomach at distal end, mouth with oral tube; manubrium with apical chamber.. Sarsia bohaiensis Xu, Wang, & Chen sp. nov. 9b Gonad covering serpentine part of manubrium long, about 1/2 of manubrium 10a Exumbrella contains 1/6 adradial nematocyst patches which form an upper and a lower circle; mature medusae, patches faintly visible or absent; radial canals do not enter mesogloea, gastrodermal chambers of bulbs shallow with prominent epidermal parts................................................................... Sarsia bella Brinckmann-Voss, 2000 10b Exumbrella with scattered nematocysts, not concentrated nematocyst patches, radial canals enter mesogloea, gastrodermal chambers of bulbs high........................................................... Sarsia densa Hartlaub, 1897