In this view of a swimming individual the kneelike articulation of several of the tentacles at the adhesive pad can be seen. Note the tan color on the manubrium, the gonads, and on the tentacle bulbs.
In this closeup the velum can be clearly seen along the margin of the bell. The manubrium is at top center, a gonad is seen along a radial canal down through the center of the photo, and the bell margin with velum and single row of tentacles with tan tentacle bulbs is visible across the bottom third.
Gonionemus vertens, 2 cm diameter, found on eelgrass in Padilla Bay, WA. The 4 radial canals with attached frilly gonads, and the hanging manubrium can be seen. (Photo by: Dave Cowles, July 2007)