### animal | arthropod:

Barnacle
* All barnacles are hermaphroditic.
* Most barnacles are hermaphrodites, meaning they have both male and female sex organs
  - hermaphroditic , although a few species are gonochoric or androdioecious
* Most barnacles eat brine shrimp
  - juvenile shrimp
  - seaweed
  - grow shells
* Most barnacles have effects
  - female organs
  - positive effects
  - inhabit shallow water
  - live in areas
  - receive protection
* Some barnacles adapt for life
  - are classified with molluscs
* Some barnacles can feed in two modes
  - survive long peroids out of the water
  - get food
* Some barnacles have appendages
  - chances
  - outer shells
  - penises
  - phases
  - plates
* Some barnacles have tough outer shells
* Some barnacles hide identities
  - in holes
  - hold cirrus
  - live in locations
  - move from sites
  - pass through stages
  - show cirrus
  - thrive in regions.
  * grows on hard surfaces like piers, boats, rocks, and on other animals such as turtles and whales. Barnacles are a different group from crabs and shrimps. They are considered a nuisance to the shipping industry and private boat owners
* adhere to piers, boats, plants, rocks and shells in the intertidal zone.
* affect urban living.
* also find a place on or in the skin of whales
  - live in their throats, chins, and urogenital slit
  - produce a proteinaceous secretion called the barnacle cement
  - actually crustaceans
  - also crustaceans
* are animals that live in the water
  - with distinct hard outer cover
  - another common arthropod
  - arthropods, a family of species that include insects and crustaceans
  - by far the commonest animals on rocky sea shores
  - crustaceans like crabs and shrimps
* are crustaceans related to lobsters, crabs and shrimp
  - shrimps and crabs
* are crustaceans, as are hermit crabs, shrimps, and pill bugs
  - sedentary relatives of shrimp, prawns, lobsters and crabs
  - displaced by limpets and mussels , which compete for space
  - encrusters, attaching themselves permanently to a hard substrate
  - filter feeders using their legs to snare plankton from the water
* are found on rocks, mangrove trees, pillars, boats
  - wherever hard surfaces meet seawater, including boats, moorings and whale heads
  - hard to remove
  - hermaphrodites that reproduce by cross-fertilization
  - hermaphroditic and one individual usually cross-fertilises with another individual
  - hermaphroditic, each individual possessing both male and female organs
  - hermaphrodytic , which means that a single animal has both male and female parts
  - male and female at the same time
  - marine animals that live in both shallow and tidal waters
  - members of the crustacean family related to crabs and shellfish
  - notorious as fouling organisms of ship bottoms and harbor installations
  - perfect for studying evolutionary specializations
  - relatives of the better known crustaceans i.e. crabs and shrimps
* are sessile and live in limestone cup they secrete
  - crustaceans that have a modified exoskeleton in the form of a shell
  - small shellfish that live in most sea water
  - subject to many predators
  - successful creatures with abundant and diverse populations
  - suspension feeders, sweeping small food into their mouth with their curved 'feet'
* belong to a family called crustaceans that include lobsters, crabs, and water fleas.
* can also live here
  - attach themselves to just about anything
  - be as big as a quater or as small as the tip on a pen
  - play an important role in estimating paleo-water depths
  - radically change the size and shape of their penises to fight the waves and have sex
  - stay wet inside their volcano-shaped shells for days at a time
  - withstand exposure to less than one-tenth the usual salt concentration of seawater
  - plankton and food scraps
* feed by directing suspended particles toward the mouth with specialized appendages.
* feed on plankton in the water
  - they sweep from the water with their fan-like feet
  - while submerged underwater
  - with thoracic appendages, but in a way that is unique among crustaceans
* form colonies.
* give the whales their characteristic mottled appearance.
* glue themselves to rocks head first
* grow by adding calcium carbonate to the edges of their shell plates
  - in six neatly fitted plates that overlap to form a ring
* hatch in the spring.
* have a rather deceptive appearance
  - very deceptive appearance
  - distinct larval stages called nauplii and cyprids
  - hard bodies, and tunicates and humans have soft bodies
  - one of the most interesting sex lives of any animal
  - really simple life cycle and lifestyle
  - shells of connected overlapping plates along with jointed legs
* have the largest penis in relation to body size in the entire animal kingdom
  - to body size ratio of the animal kingdom
* includes brains
  - carapaces
  - cell membranes
  - cells
  - cytoplasm
  - ears
  - nuclei
  - pincers
  - plasma membranes
  - sections
  - skulls
  - thoraxes
  - vacuoles
  - large colonies for a reason
  - only in salt water
* look like molluscs, but in fact they are crustaceans, like shrimp.
* often attach themselves to whales and receive free transportation to parts of the ocean
  - live near mussel beds
* populate the coastlines of countries around the world.
* probably have the largest penis to body size ratio of the animal kingdom.
* regrow their penises each year before the breeding season.
* resist desiccation and grip well to exposed rock faces.
* start life as larvae or 'cyprids' which swim around freely in the water.
* tend to settle where others of their own species have already settled.
* usually love to feed on the food particles straining out of the water.
+ Barnacle, Life-style: Crustaceans
  * Barnacles are suspension feeders, sweeping small food into their mouth with their curved 'feet'. The barnacles reproduce sexually, and produce little nauplius larvae which disperse in the plankton. Eventually, the larvae change into cypris form, and attach on other hard surfaces to form new barnacles. Their comparative anatomy was worked out in detail by Charles Darwin
  - Reproduction
  * Barnacles have the largest penis to body size ratio of the animal kingdom. A few forms have become fully parasitic on larger crustacea.
  * Barnacles are by far the commonest animals on rocky sea shores. The sea shore'