| Corymorpha pileiformis | Umbrella nearly hemispherical, apex rounded, not forming a projection; exumbrella |
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| (Xu, Huang & Guo, 2014)—M | with scattered nematocysts; mesoglea thick; an ovoid apical chamber; “manubrium |
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| pile-shaped” (the oral end of the manubrium appears upturned), connected through |
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| a “short canal” to the apical chamber; mouth thickened; main tentacle “thin and |
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| long with over 20 abaxial knobs of nematocysts and without [a] large terminal |
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| knob ”; all 4 bulbs of comparable size, well-developed, nearly spherical basally, but |
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| extending a short distance up the exumbrella. China (Xu et al. 2014: 909–910) |
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| Corymorpha pseudoabaxialis | Mesoglea relatively thick, notably apically; manubrium with a lenticular apical |
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| (Bouillon, 1978b)—M | chamber filled with oily vesicles; mouth circular; 4 large marginal bulbs, of which |
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| only one bears a tentacle provide with a dozen of nematocyst clusters abaxially. |
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| Papua New Guinea (Bouillon 1978b: 264) |
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| Corymorpha rubicincta | Polyp described in the original account. Gonophores as “probably |
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| Watson, 2008—P + G | cryptomedusoids”. Port Phillip Bay, Melbourne, Australia (Watson 2008: 186) |
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| Corymorpha russelli | Umbrella with a rounded apical projection; no nematocysts on exumbrella; main |
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| (Hamond, 1974)—M | tentacle moniliform, “carrying nine masses of large nematocysts spaced out along |
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| its length, the last one forming a terminal knob”; opposite tentacle “reduced to a |
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| protuberance”; lateral tentacles filiform, “as long as the height of the bell”. Indian |
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| Ocean, off southern Java (Hamond 1974: 550, 553) |
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| Corymorpha sagamina | Hydroid described by Hirohito (1988: 12). Medusa buds illustrated as having a |
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| Hirohito, 1988—P + M | short, broad, main tentacle with no distinct capitation, but with evenly distributed |
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| nematocysts (Hirohito 1998: fig. 2C); medusae thought to be liberable. Sagami Bay, |
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| Japan (Hirohito 1998: 12) |
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| Corymorpha sarsii | Resembles “ C. nutans, but gonophores are medusoids which remain attached |
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| Steenstrup, 1855—P + G | to the polyp ”; 4 conspicuous bulbs, all alike; blastostyles “usually branched |
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| dichotomously”. Northern Norway, Black Sea (Schuchert 2010: 391–392) |
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| Corymorpha similis | Umbrella with flat apex; mesoglea thin; manubrium longer than subumbrella; 4 |
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| (Kramp, 1959)—M | “large marginal bulbs, one of them bearing a long, stiff tentacle, almost twice as |
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| long as the height of the umbrella”, terminating “in a large knob of nematocysts”; |
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| bulbs “prolonged downwards beyond the margin of the umbrella and upwards |
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| on the exumbrella”, the smallest “being the one bearing the tentacle”, opposite |
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| bulb is “more than twice as large, the two others of intermediate size and both |
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| alike”. Possibly conspecific with C. typica (Uchida, 1927) (Kramp 1959: 5). Bali, |
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| Madagascar, Mozambique Channel, Atlantic near St. Helena (Kramp 1968: 17) |
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| Corymorpha solidonema | Mouth circular; main tentacle “short and stiff, with over 10 ring[s of] nematocysts |
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| (Huang, 1999)—M | and a large terminal nematocysts knob” (= moniliform); opposite bulb reduced, |
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| with no tentacle; lateral bulbs ending in short, filiform tentacles; all tentacle bulbs |
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| extending laterally so as to create a thickened bell margin. Taiwan Strait (Huang |
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| 1999: 438–439) |
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| Corymorpha symmetrica | Polyp likely growing on a gorgonian; “in many cases the coral grew about the |
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| Hargitt, 1924—P + G | base of the hydroid”; medusa “borne just above the basal tentacles, and on |
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| peculiar peduncles, which at first seemed to be an elongate raceme with numerous |
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| medusa buds; but, in fact; the latter on my specimens appear to be relatively few, |
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| and what at first seemed very small buds were complexely branched masses of |
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| nematocysts ”; gonophores “apparently devoid of functional tentacles […] radial |
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| and circular canals typical, but no specimen shows the character of manubrium or |
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| sex”. Philippines (Hargitt 1924: 473–474). This is, without any doubt, a species of |
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| Ralpharia Watson, 1980 |
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| Corymorpha taiwanensis | No distinct apical projection; mesoglea thick; main tentacle moniliform, “with over |
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| (Xu & Huang, 2003)—M | 16 nearly elliptic” nematocyst clusters; 3 additional, rudimentary bulbs, all alike, |
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| bearing no tentacles. Taiwan Strait (Xu & Huang 2003: 139, 144) |
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| Corymorpha tomoensis | Polyp described in the original account. Attached and newly-liberated medusae |
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| Ikeda, 1910—P + M | inadequately described, as they “dropped off and were lost when [the polyps were] |
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| killed”; nevertheless, they bear but “a single tentacle”, “somewhat moniliform”, |
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| although only the apical knob of nematocysts seems to be present at that stage. |
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| Japan: Hiroshima Prefecture (Ikeda 1910: 155), Nagasaki Prefecture (Jäderholm |
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| 1919: 3), Osaka Prefecture (Okada 1927: 498) |
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