Table 2 in Ceriantharia (Cnidaria) of the World: an annotated catalogue and key to species

Table 2. Comparison of anatomical features of Ceriantheopsis species (after Stampar et al. 2016). C. americanaC. nikitaiC. austroafricanaC. lineataMarginal tentaclesUp to 100-120Up to 70Up to 70Up to 60Directive labial tentaclePresentPresentPresentAbsentArrangement of labial tentacles(2)413.4232.4312* (4)413.4231.4312.4312(3)423.4232.4312.4312(2)313.4343.4324.31244231.4231.4231.4231Actinopharynx1/12-1/8 of gastric cavity1/5-1/4 of gastric cavity1/10-1/8 of gastric cavity1/6-1/5 of gastric cavityOral disc0.7-1.0 cm~0.6-0.7 cmWide, ~1.5 cm in preserved1.0 - 1.5 cm in preservedSiphonoglyphNarrow, 4 mesenteries attachedWide, 4 mesenteries attachedWide, 4 mesenteries attachedNarrow, 2 mesenteries attachedDirective mesenteries<Actinopharynx~Actinopharynx~Actinopharynx<ActinopharynxP2To aboral poleTo aboral poleTo aboral poleAlmost to aboral poleP3=B=B=B=BM>>B<2B>B≥BM3≤M2>M2≤M2<Half M2Cnido-glandular tract at fertile mesenteries of first quartetsPresentNot presentPresentPresentCraspedion tract at fertile mesenteries6/7-8/93/56/7~6/7-8/9Cnido-glandular tract at B<<b=b<b<bCraspedonemes of craspedion at fertile mesenteriesSometimes presentAbsentAbsentAbsent