Illustrations of common aquatic snail egg masses in Wisconsin (NOTE: egg masses can vary in length/width/diameter based on snail size and species; however, general egg-mass morphology is consistent within the listed genera.
1) Raised, elongate gelatinous masses. Often
found on stones,
sticks, stems and leaves in the water. Variable eggs/mass but ranging
between ~30-130 eggs/mass.
2. Relatively flat, elongate egg masses. Often
found on the undersides of rocky substrates ~5-40 eggs/mass
3) Large, glairy masses; globular in appearance oftentimes laid with overlapping
ends giving the mass and almost ovoid appearance. Occur on
stones, sticks, logs and aquatic plants ~ 30-200 eggs/mass.
4) Flat, ovoid egg masses, oftentimes yellowish in color. Typically
laid on vegetation ~20-40 eggs/mass.
