Table 6 in Ceriantharia (Cnidaria) of the World: an annotated catalogue and key to species

Table 6. Comparison of anatomical features of Botrucnidifer species.
B. novergicusB. shtokmaniMarginal tentaclesUp to 1772Directive labial tentaclePresentAbsentArrangement of labial tentacles(1)431.3231.3231(0)230.2024.3123.3142Actinopharynx1/4 - 1/5 of gastric cavity1/3 of gastric cavityOral disc0.3 cm1.5 cmSiphonoglyphNarrow, 2 mesenteries attachedNarrow, 4 mesenteries attachedDirective mesenteries>Actinopharynx= ActinopharynxP2Long, almost to aboral pole (> 4/5 of gastric cavity)Regular (<2/3 of gastric cavity)P3Long (2/3 of P2)Short, 1/2 of P2M1Almost to aboral pore= P2M3Almost to aboral pore (3/4 of M1)Long, 3/4 of P2Cnido-glandular tract at fertile mesenteries of first quartetsPresentPresentCraspedion tract at fertile mesenteries¾1/2 - 3/4Cnido-glandular tract at BPresentPresentBotrucnidaeOnly in M mesenteriesOnly in B/b mesenteries