File:AureliaMorphometrics.jpg

Figure: Schematic of Aurelia showing features (f) measured for this study. Oral aspect (top) and cross-section along line XYZ (bottom). f1, bell diameter (mm from 1a to 1b); f2, manubrium depth (mm); f3, folding of the oral arm (0-2, half-point intervals); f4, mass (g, not shown); f5, oral arm length (mm); f6, manubrium width (mm); f7, oral arm width (mm); f8, gastric pouch shape; f9, proximal gastric diameter (PGD, mm); f10, distal gastric diameter (DGD, mm); f11, subgenital pore diameter (mm); f12, subgenital pore position (central, inside, overlapping, outside); f13, subgenital pore thickening (0-2, half-point intervals); f14, color of gastric filaments; f15, color of gonad; f16, color of bell; f17, color of bell margin; f18, sex; f19, number of lobes; f20, number of rhopalia; f21, bell shape; f22, bell thickness; f23, perradial origins (qtr-1); f24, interradial origins (qtr-1); f25, adradial origins (qtr-1); f26, perradial anastomoses (qtr-1); f27, interradial anastomoses (qtr-1); f28, adradial anastomoses (PAI, qtr-1); f29, rhopalar indent (mm); f30, non-rhopalar indent (mm). The arrows (bottom diagram) show the positions at which bell thickness was measured (see bar above arrow at 4/5 bell radius), along opposite perradial axes in order to calculate bell shape and bell thickness. The diagram illustrates the difference between a "central ..." (lower left) and "adjacent ..." (upper left) placement of the subgenital pore, and also the proximal folding of oral arms which was noticeably greater in female (vertical arm) than male (horizontal arm) medusae of Aurelia sp. 4.