Table 1 in Glaciambulata neumayeri gen. et sp. nov., a new Antarctic trachymedusa (Cnidaria: Hydrozoa), with a revision of the family Ptychogastriidae

Table 1. Main distinguishing characters of the genera belonging to the family Ptychogastriidae Mayer, 1900.
UmbrellaGlaciambulata gen. nov. FlatPtychogastria Allman, 1878 Dome-shapedTesserogastria Beyer, 1959 Dome-shapedManubriumEight-lobedEight-lobedFour-lobedMesenteries88AbsentTentaclesFiliform + adhesive; forming contiguous groups; inserted in superimposed rows on umbrella marginFiliform + adhesive; forming contiguous groups; inserted in superimposed rows on umbrella marginFiliform; reportedly not arranged in groups; inserted at varied levels on umbrella marginCentripetal canalsAbsentPresent/absentAbsentGonadsOvoid; in pairs, on either side of the manubrial lobesOvoid; in pairs, on either side of the manubrial lobesElongated; simple; attached to the body of manubriumVelumAbsentPresentPresentStatocysts16168Ability to swimNoYesYes