Brown Line Paper Bubble
| Name: | Brown-Line Paper Bubble |
| Scientific Name: | Hydatina physis |
| Scientific Family: | Aplustridae |
| Source: | WoRMS AphiaID 215423 |
| Size: | up to 2 in. |
| Depth Range: | In shallow waters (0 – 15 ft.) |
| Sightings: | Almost never seen |
The Brown-Line Paper Bubble has a thin, fragile, rounded white shell with narrow black to brown spiral lines. Its head shield and side flaps are pink to purple-red with pale edges. Its oval body can extend well outside the shell but cannot pull fully inside it.
The Brown-Line Paper Bubble crawls over sand, seagrass and coral-covered bottoms while searching for polychaete worms. Its long feeding tube reaches into worm tubes. It can swim, camouflage itself and use toxins from its prey for defense.