Table 3 in A New Fissiparous Brittle Star, sp. nov. (Echinodermata, Ophiuroidea, Ophiacanthida), from Jeju Island, Korea.

Table 3. Comparison of morphological characters within Ophiacantha scissionis sp. nov. and morphologically similar species of Ophiacantha
O. scissionis sp. nov.O. anomalaO. dallasiiO. decaactisO. enneactisO. moniliformisO. viviparaNumber of arms6, rarely 5 or 76510956–8FissiparousyesnonononononoDisk diameter (mm)2.012.03.08.85.0519.0Arm length (mm)9.8unknown18.0unknown15.03070.0Disk spineyesyesyesyesyesyesyesTip of disk spinesharp trifidmultifidsharp trifidsharp 1 pointsharp 1 pointsharp trifiddull 1 pointDisk granulenonononoyesnoyesTip of disk granule----2 or 3 points-rounded, conical formRadial shield exposurenoyes, slightlynoyes, slightlynoyes, slightlynoOral shieldlonger than widewider than long longer than wide longer than wideas long as widewider than longas long as wideAngle of jawwider than longnarrowwider than longvery narrow, compressedvery narrow, compresseda little wider than longunknownOral papillaeapex 1, side 3 to 4apex 1, side 3 to apex 1, side 3 to 5 4apex 1, side 3apex 1, side 3apex 1, side 3 to apex 1, side 4 to 4 6Distal oral papillabroadbroadbroadnarrowbroadnarrowbroadNumber of arm spinesalmost 4, rarely 56–84764–511–12Number of tentacle scale 1111111Shape of tentacle scalesmall spinelarge oval-likesmall oval-likelarge oval-likelarge oval-likesmall spinelarge spineCollecting depth (m)35.7180–65315–294200–2000868888–12240–1100Type localityMunseom, Jejudo, South KoreaBodø, NorwayEast Sea, KoreaKamchatka Peninsula,Agattu Island, Alaska, USANorth Pacific, Falkland Islands, western Mexico Patagonia,RussiaArgentina