Crustaceans Barnacles
Acorn Barnacles www.teachnet.ie www.mtkembla-e.schools.nsw.edu.au Acorn barnacles are crustaceans that, as adults, live in a volcano shaped shell. Their shell is anchored to rock surfaces with a special kind of glue. This is an adaptation to withstand high waves. The two plates inside the volcano act like doors, which close shut when the tide goes out and the barnacle is exposed to air- an adaptation to keep from drying out. www.mtkembla-e.schools.nsw.edu.au
Stalked and gooseneck www.marinebio.net www.glaucus.org.uk Other barnacles (stalked or gooseneck barnacles) have flexible stalks that are attached to rocks, driftwood, boats, ropes, seaweed and other objects floating in the ocean. In medieval times, people used to think that gooseneck barnacles were the eggs of geese because the barnacles look like geese! www.glaucus.org.uk ashleybayles.wordpress.com
Parasitic barnacles soundwaves.usgs.gov www.hku.hk Crabs take care of parasitic barnacles that live on/in them thinking that they are their own egg masses. The crabs protect the parasitic barnacles from predators and aerate them just as they would their own eggs! www.hku.hk
Barnacles are found on….. Rocks Docks www.marinebio.net Where do barnacles live?– barnacles live in places where they can be covered in seawater. What are they found on?– they are found on all kinds of hard surfaces: rocks, docks and even garbage! They are also found on other animals, such as mussels. Garbage flickr.com www.glaucus.org.uk
Humpback whale Manatee flickr.com www.alaska-in-pictures.com There are even special kinds of barnacles that grow on marine mammals like manatees and humpback whales. Humpback whale www.alaska-in-pictures.com
flickr.com online.chabotcollege.edu Barnacles feed when they are underwater by opening their shells and fanning out their feet. They move their feet through the water and use tiny hairs to capture food particles in the water. The particles are swept into the mouth down inside the shell. Barnacles feeding (top pictures). A snail that has moved into an empty barnacle shell (bottom picture). online.chabotcollege.edu
Barnacle lifecycle Egg Nauplius www.celldynamics.org Baby barnacles look completely different than adult barnacles. The “baby barnacle” that hatches from eggs is a larval form (called a nauplius) that is swept by ocean currents as plankton. It is important to note that the larval stage lives in the water while the adult stage is attached to a surface. www.celldynamics.org allencentre.wikispaces.com
Cyprid www.serc.si.edu www.ncl.ac.uk After some time, the nauplius sinks to the bottom, where it transforms into an oval shaped body called a cyprid. The cyprid crawls around on the bottom to find a good place to stick and turn into an adult. (Note: cyprid and cypris both used) Once the cyprid has found a good place, it glues its head to the bottom, sticks its feet in the air and builds a volcano shaped shell. It is now an adult barnacle. www.serc.si.edu www.ncl.ac.uk
This is another depiction of the barnacle life cycle www.glf.dfo-mpo.gc.ca