Table 8 in Ceriantharia (Cnidaria) of the World: an annotated catalogue and key to species

Table 8. Comparison of anatomical features of Isarachnanthus species.
I. bandanensisI. maderensisI. nocturnusI. panamensisMarginal tentaclesUp to 40Up to 42Up to 60Up to 32Arrangement of labial tentacles(3)413.4242.4312.4312(1)1.11.11.11.11(1)2.12.12.12.12(2)431.4231.4231Length of actinopharynx~1/4 of gastric cavity~2/5 of gastric cavity~2/5 of gastric cavity~1/2 to 1/3 of gastric cavityHyposulcus~2/3 size of stomodeum= size of stomodeum= size of stomodeum= size of stomodeumOral disc diameter~2cm2 cm3.5 cm~0.5 cmMesentery attached to siphonoglyphBroad, 18 mesenteries attachedBroad, 10 mesenteries attachedBroad, 12-14 mesenteries attachedBroad, 16 mesenteries attachedDirective mesenteries= length of Actinopharynx> length of Actinopharynx> length of Actinopharynx>length of ActinopharynxP(C)2Long, 3/4 of gastric cavityShort, 1/3 of gastric cavityShort, 1/3 of gastric cavityLong, 3/4 of gastric cavityP(C)3Very short, <1/8 of gastric cavityVery short, ~1/6 of gastric cavityVery short, ~1/5 of gastric cavityShort, ~1/5 of gastric cavityM1Almost to aboral poreAlmost to aboral poreAlmost to aboral poreReach aboral poreM3Almost to aboral poreAlmost to aboral poreAlmost to aboral poreReach aboral poreCnido-glandular tract of fertile mesenteriesPresent (short?)PresentPresentPresent (short?)Cnido-glandular tract of BPresent (short?)Present (short)Present (short)Present (short?)AcontioidsOnly in M1- M4Only in M1-M6M1-M3 (sometimes in M4 and M5)Only in M1- M5 or absent