Corymorphidae Allman, 1872

Wang, Xuefeng, Lin, Kun, Xu, Zhenzu, Guo, Donghui & Huang, Jiaqi, 2019, Some new Hydroidomedusa (Cnidaria) from the northern South China Sea, Zoological Systematics 44 (3), pp. 191-205 : 199-200

Family Corymorphidae Allman, 1872

Corymorphidae Bouillon et al., 2006: 226–227 ; Schuchert, 2010: 377–378; Xu et al., 2014: 366–367.

Diagnosis. The family is diagnosed by: medusa dome-shaped or with apical projection, no exumbrellar cnidocyst tracks, but sometimes long abaxial spurs of marginal bulbs; manubrium mostly not extending beyond umbrella margin, tubular to fusiform, mouth simple, circular; either only one fully developed marginal tentacles, or one fully developed tentacle and three shorter ones differing also in structure; four radial canals and four marginal bulbs present, ocelli lacking; gonad undivided surrounding all length of manubrium and exceptionally also in sac-like processes of manubrium ( Gotoea ).

Remarks. The taxonomic history and synonymies see Calder (1988), Petersen (1990), Pagès & Bouillon (1997), Brinckmann-Voss & Arai (1998), Bouillon et al. (2006), Schuchert (2010) and Xu et al. (2014).

The family comprises 10 medusa genera: Corymorpha M Sars, 1835 , Gosta Huang, Xu & Lin, 2012, Eugotoea Margulis, 1989, Euphysora Maas, 1905 , Gotoea Uchida, 1927 , Mayeri Xu, Huang & Guo, 2012 , Octovannuccia Xu, Huang & Lin, 2010 , Paraeuphysilla Xu, Huang & Guo, 2011 , Paragotoea Kramp, 1942 and Yakovia Margulis, 1989 ( Bouillon et al., 2006; Xu et al., 2010, 2014; Wang et al., 2011; Huang et al., 2012), of which 8 genera are reported in China seas.

Key to the known genera (medusa) of family Corymorphidae .

1. With 8 radial canals.............................................................................................................................................................................. 2 With 4 radial canals.............................................................................................................................................................................. 3

2. With one developed marginal tentacle, ending in a large knob of cnidocyst, and three small marginal bulbs ....................................... ............................................................................................................................................ Octovannuccia Xu, Huang & Lin, 2010 * With 4 equally developed tentacles with numerous adaxial transverse cnidocyst claps and 1 small terminal cluster............................ .......................................................................................................................................... Paraeuphysilla Xu, Huang & Guo, 2011 *

3. With 1 fully developed marginal tentacle............................................................................................................................................. 4 Usually with 3 short or rudimentary marginal tentacles and one long, full developed marginal tentacle, different in structure ............ ....................................................................................................................................................................... Euphysora Maas, 1905 *

4. Exumbrella with longitudinal grooves or ridges and ribs.....................................................................................................................5 Exumbrella with uniform surface......................................................................................................................................................... 6

5. Exumbrella divided in 4 proximal leaf-shaped facets separated by 4 longitudinal large and deep grooves; umbrella without marginal bulb; one developed hollow marginal tentacle; without mesenteries ........................................................... Eugotoea Margulis, 1989 Exumbrella with 4 longitudinal ridges and ribs; umbrella with 3 marginal bulbs; with one well developed solid tentacle; with mesenteries.......................................................................................................................................... Costa Huang, Xu & Lin, 2012 *

6. Umbrella margin slightly oblique to vertical axis; one developed marginal tentacle, short and thick, ending in a large knob of cnidocysts and three small marginal bulbs ....................................................................................... Mayer Xu, Huang & Guo, 2012 * Umbrella margin at right angle to vertical axis ....................................................................................................................................7

7. Gonads on manubrium and on 4 sausages like interradial manubrium pouches ................................................ Gotoea Uchida, 1927 * Gonads simple; manubrium without interradial pouches .....................................................................................................................8

8. Fully developed marginal tentacle slender, long, moniliform; pointed apical process ............................. Corymorpha M. Sars, 1835 * Fully developed marginal tentacle ending in single cnidocyst capitation or in cluster of cnidocyst capitation; no pointed apical process ............................................................................................................................................................................................................9

9. Fully developed marginal tentacle with a terminal cnidocyst knob; with one tentacle and three non-tentacular bulbs.......................... ................................................................................................................................................................... Paragotoea Kramp, 1942 *

Fully developed marginal tentacle with terminal ramifications ending in numerous cnidocyst cluster, with only one marginal bulb bearing tentacle ............................................................................................................................................... Yakovia Margulis, 1989

* Present in China Seas