Definition and meaning of sea star:

sea star - an echinoderm characterized by radial symmetry, and usually with five arms (rays) radiating from a central body. Minute pincer-like structures on the arms, called pedicellaria, ensure that the surface of the arms stay free from algae. There are a few sea stars that have 6 or 7 arms, and some with even more. Injuries will also cause more arms to grow. The majority of sea stars are carnivorous and feed on sponges, bryozoans, ascidians and mollusks. Other are detritus feeders or scavengers. Some sea stars, for example the crown-of-thorns that feeds on coral polyps, are specialized feeders; also called "starfish"

(Source: US National Oceanic and Atmospheric Administration (NOAA) )

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The body cavity also contains the water vascular system that operates the tube feet, and the hemal system. Hemal channels form rings around the mouth (the oral hemal ring), closer to the top of the starfish and around the digestive system (the gastric hemal ring). The axial sinus, a portion of the body cavity, connects the three rings. Each ray also has hemal channels running next to the gonads. < ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - Internal Anatomy

Inside the sea star underneath the hepatic caeca are the gonads which are involved in reproduction. The space inside the body not occupied by the internal organs is known as the perivisceral coelom. The body cavity also contains the water vascular system that operates the tube feet, and the hemal system. Hemal channels form rings around the mouth (the oral hemal ring), closer to the top of the starfish (the aboral hemal ring), and around the digestive system (the gastric hemal ring). The axial sinus, a portion of the body cavity, connects the three rings. Each ray also has hemal channels running next to the gonads. < ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - Internal Anatomy

This is a sitemap for Oceanography - S . Click on a link and you will find multiple definitions and articles related to the word. The sitemap(s) covers over 5.184 different Oceanography terms.

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Read more here: » Oceanography Sitemap I - S

Sea star - Reproduction. Most starfish reproduce in a method similar to the sponge. The starfish gather in a group (using environmental signals to coordinate the timing), metamorphose into juvenile sea stars and can begin living on the ocean floor. Sea stars are developmentally (embryologically) known as deuterostomes. Since echinoderms and chordates share this same embryological pattern, they are thought to be closely related. Nevertheless, as these creatures are invertebrates and not actually fish, most marine biologists are pushing to completely replace the term starfish with sea star. < ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - Behaviour

Sea stars are composed of a central disc from which arms sprout in radial symmetry. Most starfish have five arms, however some have more or less; in fact some starfish can have different numbers of legs within one species. The mouth is located underneath the sea star on the oral or ventral suface, while the anus is located on the top of the animal. The spiny upper surface covering the species is called the aboral or dorsal surface. On the aboral surface there is a structure called the madreporite which acts as a water filter and supplies the sea sta ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - External Anatomy

Sea star - Reproduction. Most starfish reproduce in a method similar to the sponge. The starfish gather in a group (using environmental signals to coordinate the timing), and release their gametes into the water, where they will hopefully connect with gametes from the opposite sex. After fertilization, there are a variety of ways that the eggs can proceed. Small eggs (those without much yolk) grow into free-swimming larvae which feed on small organisms until they metamorphose into juvenile sea stars and ca ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - Behaviour

Sea stars are composed of a central disc with (usually) five arms exhibiting pentaradial symmetry. The mouth is located underneath the sea star on the oral or ventral suface. The spiny upper surface covering the species is called the aboral or dorsal surface. On the aboral surface there is a structure called the madreporite which acts as a water filter and supplies the sea star's water vascular system with water to move. Sea stars have a simple eye at the end of each arm. The eye is able to "see" only differences of light and ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - External Anatomy

Fossil sea stars and brittle stars are first known from rocks of Ordovician age (Herringshaw, 2004; Shackleton, 2005; Blake & Guensburg, 2005), indicating that two groups probably diverged in the Cambrian. However, Ordovician examples of the two groups show many similarites and can be difficult to distinguish (see e.g. Sutton et al, 2005). Complete fossil sea stars are very rare, but where they do occur they may be abundant. Most fossil sea stars consist of scattered individual plates or segments of arms. This is because the skeleton is ...

See also:

Sea star, Sea star - Distribution, Sea star - External Anatomy, Sea star - Internal Anatomy, Sea star - Digestion and excretion, Sea star - Nervous System, Sea star - Circulation and respiration, Sea star - Behaviour, Sea star - Reproduction, Sea star - Locomotion, Sea star - Regeneration, Sea star - Geological history

Read more here: » Sea star: Encyclopedia II - Sea star - Geological history