Morphological characteristics of ephyrae of Aurelia coerulea derived from planula strobilation

Abstract Ephyrae are produced through the strobilation of polyps in general life cycle Aurelia coerulea . However, it has been reported that planulae can also metamorphose directly into ephyrae, without passing polyp stage. There is a mixture ephyrae developed from (planula-strobilated ephyrae) and (polyp-strobilated ephyra population. effect planula-strobilated on population yet to be determined, since their morphological characteristics have not elucidated. This study aimed determine distinguish between polyp-strobilated ephyrae. The differences body dimensions, such as total diameter (TBD), central disc (CDD), lappet stem length (LStL), rhopalial (RLL), marginal (TMLL) were compared two types ephyra. Thus, we show proportions used identify planula- ranges for identifying 35.0–38.3% CDD/TBD, 56.7–64.9% LStL/CDD, 84.7–99.5% TMLL/CDD, 31.0–37.5% RLL/TMLL. method could an important basis devising countermeasures jellyfish blooms areas where deriving planula occur.