Starfish : Scientific Name, Behavior & Appearance

Starfishes are star shaped, marine invertebrate echinoderms. Although some starfish species have more arms, they typically have a center disc and five arms. The aboral or top surface is made up of overlapping plates and can be smooth, granular, or spiky.

Key Terms: Starfish, Taxonomy, Asteroidea, Zoological Terminology

What is a Starfish?

[Click Here for Sample Questions]

Starfishes are star shaped,marine invertebrate echinoderms. There is no evidence to date to suggest that they are a terrestrial or freshwater species. They have an advanced organ system and are multicellular in nature. 

A Starfish is colourful in appearance and shaped like star. They also have unique ecological and geological significance. For both circulatory and gaseous exchange operations, they have a water vascular system.

Starfish

A starfish's arm spread may grow to a maximum of 3.3 feet, making the Sunflower sea star (Pycnopodia helianthoides) one of the world's biggest starfish species. Even though they appear passive and move slowly, starfishes are vicious coral predators that damage coral reefs, the Crown-of-thorns Starfish.

Also read: Why are Living Organisms Classified?

Scientific Name of Starfish

[Click Here for Sample Questions]

The scientific name of the common starfish is Asterias Rubens. 

• The word "aster" means "star," and the word "eidos" means "form," therefore the zoological name Asteroidea translates to "star-shaped."
• One of the biggest subclasses of the Echinodermata is the Asteroidea.
• Sea urchins, sea cucumbers, and sand dollars are examples of more echinoderms.
• While many echinoderms, including some of the several species of starfish, are capable of having far more complex structures, the majority of these organisms share the five-pointed structure of ordinary sea stars.

What do Starfishes eat?

Starfishes are carnivorous, detritivorous, and scavenging.With their suction-cupped feet, sea stars' main food source is mollusks like clams, mussels, and oysters, which they open to eat.

Where are starfishes found?

Sea stars are creatures that inhabit salt water and may be found in all seas, from the chilly bottom to warm tropical waters.The deep sea bottom, which is at least 6,000 metres below the surface, kelp forests, seagrass meadows, rocky beaches, tidal pools, mud, and sand are among the habitats. Coastal locations have the highest species diversity.

Learn More About:

Taxonomy of Starfish

[Click Here for Sample Questions]

Biology defines the class of starfish as Class Asteroidea in Linnaean taxonomy.

Different Species of Starfishes

[Click Here for Sample Questions]

Over 2,000 different species of starfish have been identified, and new ones are routinely found during oceanographic study. These creatures come in many various varieties, much like the locations where they may be found. It's not surprising that so many sea stars have zoological and vernacular names that represent their distinctive sorts of beauty given their range of vivid hues and artistic shapes. The most prominent varieties include:

• Common Starfish 

Asterias rubens, a common starfish, is a straightforward, five-pointed creature with a peachy orange hue. These aquatic creatures, often known as sugar starfish, may be found all along the Atlantic coast.

• Sunflower Starfish

The Pacific Ocean is home to Pycnopodia helianthoides, the sunflower starfish. These sea stars come in a variety of hues and can have up to 24 limbs.

• Royal Starfish

The West Atlantic is home to the royal starfish, Astropecten articulatus. They feature five points, like like sugar starfish, but stand out thanks to their vivid purple and orange hues.

• Necklace Starfish

Fromia monilis, a starfish from the West Pacific, gets its name from the body plates that resemble beads on a necklace. They are referred to as tiling starfish in certain places.

• Chocolate chip sea stars

Protoreaster nodosus, often known as chocolate chip sea stars, can be found in the Pacific Ocean close to Indonesia. Their black spikes, which resemble chocolate chips, help identify these creatures.

Features of Starfish

[Click Here for Sample Questions]

Here are some common features of a starfish:

• Although starfishes have bilateral symmetry as larvae, they exhibit radial symmetry as adults.
• Their exoskeleton is made of calcium.
• They have a unique water vascular system in them that mostly aids in the circulation process.
• They are dioecious in nature and their body growth is indirect.

Starfish Reproduction and Lifespan

These organisms are solitary by nature, but every two years they congregate in big numbers to breed. They often couple off with a partner of the opposing gender to reproduce. Once the eggs are fertilized, both sea stars will release a cloud of spawn into the water, where it will drift to the ocean floor.

After the eggs are deposited, these creatures don't seem to care for their offspring. The embryos are not fully formed when they hatch, but as they grow, the young gradually acquire limbs and take on their adult shape. These creatures have a lifespan of up to 40 years and as they mature, their limbs continue to grow and expand.

Also Check:

Things to Remember

[Click Here for Sample Questions]

• The scientific name of the common Starfish is Asterias Rubens.
• Although starfishes have bilateral symmetry as larvae, they exhibit radial symmetry as adults.
• Starfishes are carnivorous, detritivorous, and scavenging
• Starfishes are solitary by nature, but every two years they congregate in big numbers to breed.
• Sea stars are creatures that inhabit salt water and may be found in all seas, from the chilly bottom to warm tropical waters